2008-09-01 05:13:32 +02:00
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/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson;
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2011-09-11 09:04:56 +02:00
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import com.google.gson.internal.ConstructorConstructor;
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2011-11-22 08:37:13 +01:00
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import com.google.gson.internal.Excluder;
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2011-09-11 09:04:56 +02:00
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import com.google.gson.internal.Primitives;
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2011-08-03 04:40:18 +02:00
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import com.google.gson.internal.Streams;
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2011-08-03 03:19:26 +02:00
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import com.google.gson.internal.bind.ArrayTypeAdapter;
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2011-09-11 09:04:56 +02:00
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import com.google.gson.internal.bind.CollectionTypeAdapterFactory;
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2011-09-26 23:44:08 +02:00
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import com.google.gson.internal.bind.DateTypeAdapter;
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2014-03-10 00:08:54 +01:00
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import com.google.gson.internal.bind.AdaptAnnotationTypeAdapterFactory;
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2011-12-03 03:37:27 +01:00
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import com.google.gson.internal.bind.JsonTreeReader;
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2011-12-30 09:27:24 +01:00
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import com.google.gson.internal.bind.JsonTreeWriter;
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2011-09-11 09:04:56 +02:00
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import com.google.gson.internal.bind.MapTypeAdapterFactory;
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2011-09-09 05:31:16 +02:00
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import com.google.gson.internal.bind.ObjectTypeAdapter;
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2011-09-11 09:04:56 +02:00
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import com.google.gson.internal.bind.ReflectiveTypeAdapterFactory;
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2011-09-28 19:56:54 +02:00
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import com.google.gson.internal.bind.SqlDateTypeAdapter;
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2011-09-26 23:44:08 +02:00
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import com.google.gson.internal.bind.TimeTypeAdapter;
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2011-08-03 03:19:26 +02:00
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import com.google.gson.internal.bind.TypeAdapters;
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2011-08-03 02:47:36 +02:00
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import com.google.gson.reflect.TypeToken;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonToken;
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import com.google.gson.stream.JsonWriter;
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import com.google.gson.stream.MalformedJsonException;
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2012-10-23 19:36:30 +02:00
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.lang.reflect.Type;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.HashMap;
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2014-03-09 09:36:24 +01:00
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import java.util.HashSet;
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2012-10-23 19:36:30 +02:00
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import java.util.List;
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import java.util.Map;
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2014-03-09 09:36:24 +01:00
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import java.util.Set;
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2011-08-03 02:47:36 +02:00
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2008-09-01 05:13:32 +02:00
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/**
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* This is the main class for using Gson. Gson is typically used by first constructing a
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* Gson instance and then invoking {@link #toJson(Object)} or {@link #fromJson(String, Class)}
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* methods on it.
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*
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* <p>You can create a Gson instance by invoking {@code new Gson()} if the default configuration
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* is all you need. You can also use {@link GsonBuilder} to build a Gson instance with various
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* configuration options such as versioning support, pretty printing, custom
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* {@link JsonSerializer}s, {@link JsonDeserializer}s, and {@link InstanceCreator}s.</p>
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*
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* <p>Here is an example of how Gson is used for a simple Class:
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*
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* <pre>
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* Gson gson = new Gson(); // Or use new GsonBuilder().create();
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* MyType target = new MyType();
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* String json = gson.toJson(target); // serializes target to Json
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* MyType target2 = gson.fromJson(json, MyType.class); // deserializes json into target2
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* </pre></p>
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*
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* <p>If the object that your are serializing/deserializing is a {@code ParameterizedType}
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* (i.e. contains at least one type parameter and may be an array) then you must use the
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* {@link #toJson(Object, Type)} or {@link #fromJson(String, Type)} method. Here is an
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* example for serializing and deserialing a {@code ParameterizedType}:
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*
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* <pre>
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2009-09-22 21:10:53 +02:00
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* Type listType = new TypeToken<List<String>>() {}.getType();
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* List<String> target = new LinkedList<String>();
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2008-09-01 05:13:32 +02:00
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* target.add("blah");
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*
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* Gson gson = new Gson();
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* String json = gson.toJson(target, listType);
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2009-09-22 21:10:53 +02:00
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* List<String> target2 = gson.fromJson(json, listType);
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2008-09-01 05:13:32 +02:00
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* </pre></p>
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*
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* <p>See the <a href="https://sites.google.com/site/gson/gson-user-guide">Gson User Guide</a>
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* for a more complete set of examples.</p>
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*
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* @see com.google.gson.reflect.TypeToken
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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2012-04-12 20:49:27 +02:00
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* @author Jesse Wilson
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2008-09-01 05:13:32 +02:00
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*/
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public final class Gson {
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2011-11-21 06:42:30 +01:00
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static final boolean DEFAULT_JSON_NON_EXECUTABLE = false;
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2009-10-07 11:23:14 +02:00
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2009-03-20 19:02:35 +01:00
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private static final String JSON_NON_EXECUTABLE_PREFIX = ")]}'\n";
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2009-03-17 22:15:10 +01:00
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2011-11-20 16:23:08 +01:00
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/**
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* This thread local guards against reentrant calls to getAdapter(). In
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* certain object graphs, creating an adapter for a type may recursively
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* require an adapter for the same type! Without intervention, the recursive
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* lookup would stack overflow. We cheat by returning a proxy type adapter.
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* The proxy is wired up once the initial adapter has been created.
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*/
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private final ThreadLocal<Map<TypeToken<?>, FutureTypeAdapter<?>>> calls
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= new ThreadLocal<Map<TypeToken<?>, FutureTypeAdapter<?>>>();
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2011-11-20 16:23:08 +01:00
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2011-11-26 16:30:38 +01:00
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private final Map<TypeToken<?>, TypeAdapter<?>> typeTokenCache
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= Collections.synchronizedMap(new HashMap<TypeToken<?>, TypeAdapter<?>>());
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2014-03-10 00:00:53 +01:00
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/** Indicates whether Gson is in the phase of constructor invocation. It is used to determine
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* whether to add a constructor in preconfiguredGeneratedTypeAdapter set or not. */
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private boolean inConstructorPhase = true;
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/** List of type adapters that are generated by Gson during its constructor */
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private Set<TypeAdapter<?>> preconfiguredGeneratedTypeAdapters = new HashSet<TypeAdapter<?>>();
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/** List of type adapters that are generated by Gson during toJson/fromJson. */
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private final ThreadLocal<Set<TypeAdapter<?>>> runtimeGeneratedTypeAdapters =
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new ThreadLocal<Set<TypeAdapter<?>>>();
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2011-12-23 19:27:13 +01:00
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private final List<TypeAdapterFactory> factories;
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2011-09-11 09:04:56 +02:00
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private final ConstructorConstructor constructorConstructor;
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2008-09-01 05:13:32 +02:00
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private final boolean serializeNulls;
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2010-09-02 02:15:23 +02:00
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private final boolean htmlSafe;
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2009-03-17 22:15:10 +01:00
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private final boolean generateNonExecutableJson;
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2010-11-02 00:03:41 +01:00
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private final boolean prettyPrinting;
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2009-03-17 22:15:10 +01:00
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2011-11-20 20:55:01 +01:00
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final JsonDeserializationContext deserializationContext = new JsonDeserializationContext() {
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2011-12-04 11:24:07 +01:00
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@SuppressWarnings("unchecked")
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public <T> T deserialize(JsonElement json, Type typeOfT) throws JsonParseException {
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2011-11-20 20:55:01 +01:00
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return (T) fromJson(json, typeOfT);
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}
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};
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final JsonSerializationContext serializationContext = new JsonSerializationContext() {
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public JsonElement serialize(Object src) {
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return toJsonTree(src);
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}
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public JsonElement serialize(Object src, Type typeOfSrc) {
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return toJsonTree(src, typeOfSrc);
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}
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};
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2008-09-01 05:13:32 +02:00
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/**
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* Constructs a Gson object with default configuration. The default configuration has the
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* following settings:
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* <ul>
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* <li>The JSON generated by <code>toJson</code> methods is in compact representation. This
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* means that all the unneeded white-space is removed. You can change this behavior with
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* {@link GsonBuilder#setPrettyPrinting()}. </li>
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* <li>The generated JSON omits all the fields that are null. Note that nulls in arrays are
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* kept as is since an array is an ordered list. Moreover, if a field is not null, but its
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* generated JSON is empty, the field is kept. You can configure Gson to serialize null values
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* by setting {@link GsonBuilder#serializeNulls()}.</li>
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* <li>Gson provides default serialization and deserialization for Enums, {@link Map},
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* {@link java.net.URL}, {@link java.net.URI}, {@link java.util.Locale}, {@link java.util.Date},
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* {@link java.math.BigDecimal}, and {@link java.math.BigInteger} classes. If you would prefer
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* to change the default representation, you can do so by registering a type adapter through
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* {@link GsonBuilder#registerTypeAdapter(Type, Object)}. </li>
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2009-10-07 11:23:14 +02:00
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* <li>The default Date format is same as {@link java.text.DateFormat#DEFAULT}. This format
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2008-10-13 20:40:20 +02:00
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* ignores the millisecond portion of the date during serialization. You can change
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2008-09-01 05:13:32 +02:00
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* this by invoking {@link GsonBuilder#setDateFormat(int)} or
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* {@link GsonBuilder#setDateFormat(String)}. </li>
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* <li>By default, Gson ignores the {@link com.google.gson.annotations.Expose} annotation.
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* You can enable Gson to serialize/deserialize only those fields marked with this annotation
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* through {@link GsonBuilder#excludeFieldsWithoutExposeAnnotation()}. </li>
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* <li>By default, Gson ignores the {@link com.google.gson.annotations.Since} annotation. You
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* can enable Gson to use this annotation through {@link GsonBuilder#setVersion(double)}.</li>
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* <li>The default field naming policy for the output Json is same as in Java. So, a Java class
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* field <code>versionNumber</code> will be output as <code>"versionNumber@quot;</code> in
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* Json. The same rules are applied for mapping incoming Json to the Java classes. You can
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* change this policy through {@link GsonBuilder#setFieldNamingPolicy(FieldNamingPolicy)}.</li>
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* <li>By default, Gson excludes <code>transient</code> or <code>static</code> fields from
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* consideration for serialization and deserialization. You can change this behavior through
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* {@link GsonBuilder#excludeFieldsWithModifiers(int...)}.</li>
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* </ul>
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*/
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public Gson() {
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2011-11-22 08:37:13 +01:00
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this(Excluder.DEFAULT, FieldNamingPolicy.IDENTITY,
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2011-11-23 07:16:55 +01:00
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Collections.<Type, InstanceCreator<?>>emptyMap(), false, false, DEFAULT_JSON_NON_EXECUTABLE,
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true, false, false, LongSerializationPolicy.DEFAULT,
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2011-12-23 19:27:13 +01:00
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Collections.<TypeAdapterFactory>emptyList());
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2008-09-01 05:13:32 +02:00
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}
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2011-11-22 08:37:13 +01:00
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Gson(final Excluder excluder, final FieldNamingStrategy fieldNamingPolicy,
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2011-11-23 07:16:55 +01:00
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final Map<Type, InstanceCreator<?>> instanceCreators, boolean serializeNulls,
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2011-09-12 07:51:17 +02:00
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boolean complexMapKeySerialization, boolean generateNonExecutableGson, boolean htmlSafe,
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boolean prettyPrinting, boolean serializeSpecialFloatingPointValues,
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2011-09-28 21:14:46 +02:00
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LongSerializationPolicy longSerializationPolicy,
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2011-12-23 19:27:13 +01:00
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List<TypeAdapterFactory> typeAdapterFactories) {
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2011-09-11 09:04:56 +02:00
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this.constructorConstructor = new ConstructorConstructor(instanceCreators);
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2008-09-01 05:13:32 +02:00
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this.serializeNulls = serializeNulls;
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2009-03-17 22:15:10 +01:00
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this.generateNonExecutableJson = generateNonExecutableGson;
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2010-09-02 02:15:23 +02:00
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this.htmlSafe = htmlSafe;
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2010-11-02 00:03:41 +01:00
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this.prettyPrinting = prettyPrinting;
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2011-08-03 02:28:02 +02:00
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2011-12-23 19:27:13 +01:00
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List<TypeAdapterFactory> factories = new ArrayList<TypeAdapterFactory>();
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2011-11-23 14:39:06 +01:00
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// built-in type adapters that cannot be overridden
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2012-06-30 04:37:49 +02:00
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factories.add(TypeAdapters.JSON_ELEMENT_FACTORY);
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factories.add(ObjectTypeAdapter.FACTORY);
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2012-12-20 20:41:33 +01:00
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// the excluder must precede all adapters that handle user-defined types
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factories.add(excluder);
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2012-06-30 04:37:49 +02:00
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// user's type adapters
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factories.addAll(typeAdapterFactories);
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// type adapters for basic platform types
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2011-11-20 16:23:08 +01:00
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factories.add(TypeAdapters.STRING_FACTORY);
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factories.add(TypeAdapters.INTEGER_FACTORY);
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factories.add(TypeAdapters.BOOLEAN_FACTORY);
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factories.add(TypeAdapters.BYTE_FACTORY);
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factories.add(TypeAdapters.SHORT_FACTORY);
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factories.add(TypeAdapters.newFactory(long.class, Long.class,
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longAdapter(longSerializationPolicy)));
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factories.add(TypeAdapters.newFactory(double.class, Double.class,
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doubleAdapter(serializeSpecialFloatingPointValues)));
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factories.add(TypeAdapters.newFactory(float.class, Float.class,
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floatAdapter(serializeSpecialFloatingPointValues)));
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factories.add(TypeAdapters.NUMBER_FACTORY);
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factories.add(TypeAdapters.CHARACTER_FACTORY);
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factories.add(TypeAdapters.STRING_BUILDER_FACTORY);
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factories.add(TypeAdapters.STRING_BUFFER_FACTORY);
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2012-03-18 18:55:15 +01:00
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factories.add(TypeAdapters.newFactory(BigDecimal.class, TypeAdapters.BIG_DECIMAL));
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factories.add(TypeAdapters.newFactory(BigInteger.class, TypeAdapters.BIG_INTEGER));
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2011-11-20 16:23:08 +01:00
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factories.add(TypeAdapters.URL_FACTORY);
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factories.add(TypeAdapters.URI_FACTORY);
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factories.add(TypeAdapters.UUID_FACTORY);
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factories.add(TypeAdapters.LOCALE_FACTORY);
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factories.add(TypeAdapters.INET_ADDRESS_FACTORY);
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factories.add(TypeAdapters.BIT_SET_FACTORY);
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factories.add(DateTypeAdapter.FACTORY);
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factories.add(TypeAdapters.CALENDAR_FACTORY);
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factories.add(TimeTypeAdapter.FACTORY);
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factories.add(SqlDateTypeAdapter.FACTORY);
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factories.add(TypeAdapters.TIMESTAMP_FACTORY);
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factories.add(ArrayTypeAdapter.FACTORY);
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factories.add(TypeAdapters.ENUM_FACTORY);
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2011-12-22 23:31:43 +01:00
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factories.add(TypeAdapters.CLASS_FACTORY);
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2012-06-30 04:37:49 +02:00
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// type adapters for composite and user-defined types
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factories.add(new CollectionTypeAdapterFactory(constructorConstructor));
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factories.add(new MapTypeAdapterFactory(constructorConstructor, complexMapKeySerialization));
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2014-03-10 00:08:54 +01:00
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factories.add(new AdaptAnnotationTypeAdapterFactory(constructorConstructor));
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2012-01-01 16:46:33 +01:00
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factories.add(new ReflectiveTypeAdapterFactory(
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constructorConstructor, fieldNamingPolicy, excluder));
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2011-11-20 16:23:08 +01:00
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this.factories = Collections.unmodifiableList(factories);
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2014-03-10 00:00:53 +01:00
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this.preconfiguredGeneratedTypeAdapters = Collections.unmodifiableSet(preconfiguredGeneratedTypeAdapters);
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inConstructorPhase = false;
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2011-08-05 00:57:36 +02:00
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}
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2011-09-09 06:39:29 +02:00
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private TypeAdapter<Number> doubleAdapter(boolean serializeSpecialFloatingPointValues) {
|
2011-08-05 01:12:49 +02:00
|
|
|
if (serializeSpecialFloatingPointValues) {
|
|
|
|
return TypeAdapters.DOUBLE;
|
|
|
|
}
|
2011-09-09 06:39:29 +02:00
|
|
|
return new TypeAdapter<Number>() {
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public Double read(JsonReader in) throws IOException {
|
|
|
|
if (in.peek() == JsonToken.NULL) {
|
|
|
|
in.nextNull();
|
2011-09-11 09:04:56 +02:00
|
|
|
return null;
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
return in.nextDouble();
|
2011-08-05 01:12:49 +02:00
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public void write(JsonWriter out, Number value) throws IOException {
|
2011-09-11 09:04:56 +02:00
|
|
|
if (value == null) {
|
2011-12-03 20:46:25 +01:00
|
|
|
out.nullValue();
|
2011-09-11 09:04:56 +02:00
|
|
|
return;
|
|
|
|
}
|
2011-09-09 06:39:29 +02:00
|
|
|
double doubleValue = value.doubleValue();
|
|
|
|
checkValidFloatingPoint(doubleValue);
|
2011-12-03 20:46:25 +01:00
|
|
|
out.value(value);
|
2011-08-05 01:12:49 +02:00
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
2011-09-09 06:39:29 +02:00
|
|
|
private TypeAdapter<Number> floatAdapter(boolean serializeSpecialFloatingPointValues) {
|
2011-08-05 01:12:49 +02:00
|
|
|
if (serializeSpecialFloatingPointValues) {
|
|
|
|
return TypeAdapters.FLOAT;
|
|
|
|
}
|
2011-09-09 06:39:29 +02:00
|
|
|
return new TypeAdapter<Number>() {
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public Float read(JsonReader in) throws IOException {
|
|
|
|
if (in.peek() == JsonToken.NULL) {
|
|
|
|
in.nextNull();
|
2011-09-11 09:04:56 +02:00
|
|
|
return null;
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
return (float) in.nextDouble();
|
2011-08-05 01:12:49 +02:00
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public void write(JsonWriter out, Number value) throws IOException {
|
2011-09-11 09:04:56 +02:00
|
|
|
if (value == null) {
|
2011-12-03 20:46:25 +01:00
|
|
|
out.nullValue();
|
2011-09-11 09:04:56 +02:00
|
|
|
return;
|
|
|
|
}
|
2011-09-09 06:39:29 +02:00
|
|
|
float floatValue = value.floatValue();
|
|
|
|
checkValidFloatingPoint(floatValue);
|
2011-12-03 20:46:25 +01:00
|
|
|
out.value(value);
|
2011-08-05 01:12:49 +02:00
|
|
|
}
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
private void checkValidFloatingPoint(double value) {
|
|
|
|
if (Double.isNaN(value) || Double.isInfinite(value)) {
|
|
|
|
throw new IllegalArgumentException(value
|
|
|
|
+ " is not a valid double value as per JSON specification. To override this"
|
2013-02-04 17:05:00 +01:00
|
|
|
+ " behavior, use GsonBuilder.serializeSpecialFloatingPointValues() method.");
|
2011-08-05 01:12:49 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-09-09 06:39:29 +02:00
|
|
|
private TypeAdapter<Number> longAdapter(LongSerializationPolicy longSerializationPolicy) {
|
2011-08-05 00:57:36 +02:00
|
|
|
if (longSerializationPolicy == LongSerializationPolicy.DEFAULT) {
|
|
|
|
return TypeAdapters.LONG;
|
|
|
|
}
|
2011-09-09 06:39:29 +02:00
|
|
|
return new TypeAdapter<Number>() {
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public Number read(JsonReader in) throws IOException {
|
|
|
|
if (in.peek() == JsonToken.NULL) {
|
|
|
|
in.nextNull();
|
2011-09-11 09:04:56 +02:00
|
|
|
return null;
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
return in.nextLong();
|
2011-08-05 00:57:36 +02:00
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public void write(JsonWriter out, Number value) throws IOException {
|
2011-09-11 09:04:56 +02:00
|
|
|
if (value == null) {
|
2011-12-03 20:46:25 +01:00
|
|
|
out.nullValue();
|
2011-09-11 09:04:56 +02:00
|
|
|
return;
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
out.value(value.toString());
|
2011-08-05 00:57:36 +02:00
|
|
|
}
|
|
|
|
};
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
2009-10-07 11:23:14 +02:00
|
|
|
|
2011-11-20 16:23:08 +01:00
|
|
|
/**
|
|
|
|
* Returns the type adapter for {@code} type.
|
|
|
|
*
|
|
|
|
* @throws IllegalArgumentException if this GSON cannot serialize and
|
|
|
|
* deserialize {@code type}.
|
|
|
|
*/
|
2011-12-04 11:24:07 +01:00
|
|
|
@SuppressWarnings("unchecked")
|
2011-11-20 16:23:08 +01:00
|
|
|
public <T> TypeAdapter<T> getAdapter(TypeToken<T> type) {
|
2011-11-26 16:30:38 +01:00
|
|
|
TypeAdapter<?> cached = typeTokenCache.get(type);
|
|
|
|
if (cached != null) {
|
|
|
|
return (TypeAdapter<T>) cached;
|
|
|
|
}
|
2011-11-20 16:23:08 +01:00
|
|
|
|
|
|
|
Map<TypeToken<?>, FutureTypeAdapter<?>> threadCalls = calls.get();
|
2013-01-14 23:05:28 +01:00
|
|
|
boolean requiresThreadLocalCleanup = false;
|
2012-10-23 04:41:34 +02:00
|
|
|
if (threadCalls == null) {
|
|
|
|
threadCalls = new HashMap<TypeToken<?>, FutureTypeAdapter<?>>();
|
|
|
|
calls.set(threadCalls);
|
2013-01-14 23:05:28 +01:00
|
|
|
requiresThreadLocalCleanup = true;
|
2012-10-23 04:41:34 +02:00
|
|
|
}
|
|
|
|
|
2011-12-04 11:24:07 +01:00
|
|
|
// the key and value type parameters always agree
|
2011-11-20 16:23:08 +01:00
|
|
|
FutureTypeAdapter<T> ongoingCall = (FutureTypeAdapter<T>) threadCalls.get(type);
|
|
|
|
if (ongoingCall != null) {
|
|
|
|
return ongoingCall;
|
|
|
|
}
|
|
|
|
|
|
|
|
try {
|
2013-01-14 23:05:28 +01:00
|
|
|
FutureTypeAdapter<T> call = new FutureTypeAdapter<T>();
|
|
|
|
threadCalls.put(type, call);
|
|
|
|
|
2011-12-23 19:27:13 +01:00
|
|
|
for (TypeAdapterFactory factory : factories) {
|
2011-11-20 16:23:08 +01:00
|
|
|
TypeAdapter<T> candidate = factory.create(this, type);
|
|
|
|
if (candidate != null) {
|
|
|
|
call.setDelegate(candidate);
|
2011-11-26 16:30:38 +01:00
|
|
|
typeTokenCache.put(type, candidate);
|
2011-11-20 16:23:08 +01:00
|
|
|
return candidate;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
throw new IllegalArgumentException("GSON cannot handle " + type);
|
|
|
|
} finally {
|
|
|
|
threadCalls.remove(type);
|
2013-01-14 23:05:28 +01:00
|
|
|
|
|
|
|
if (requiresThreadLocalCleanup) {
|
|
|
|
calls.remove();
|
|
|
|
}
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-12-31 09:52:59 +01:00
|
|
|
/**
|
2012-04-12 20:49:27 +02:00
|
|
|
* This method is used to get an alternate type adapter for the specified type. This is used
|
|
|
|
* to access a type adapter that is overridden by a {@link TypeAdapterFactory} that you
|
|
|
|
* may have registered. This features is typically used when you want to register a type
|
|
|
|
* adapter that does a little bit of work but then delegates further processing to the Gson
|
|
|
|
* default type adapter. Here is an example:
|
|
|
|
* <p>Let's say we want to write a type adapter that counts the number of objects being read
|
|
|
|
* from or written to JSON. We can achieve this by writing a type adapter factory that uses
|
|
|
|
* the <code>getDelegateAdapter</code> method:
|
|
|
|
* <pre> {@code
|
|
|
|
* class StatsTypeAdapterFactory implements TypeAdapterFactory {
|
|
|
|
* public int numReads = 0;
|
|
|
|
* public int numWrites = 0;
|
|
|
|
* public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
|
|
|
|
* final TypeAdapter<T> delegate = gson.getDelegateAdapter(this, type);
|
|
|
|
* return new TypeAdapter<T>() {
|
|
|
|
* public void write(JsonWriter out, T value) throws IOException {
|
|
|
|
* ++numWrites;
|
|
|
|
* delegate.write(out, value);
|
|
|
|
* }
|
|
|
|
* public T read(JsonReader in) throws IOException {
|
|
|
|
* ++numReads;
|
|
|
|
* return delegate.read(in);
|
|
|
|
* }
|
|
|
|
* };
|
|
|
|
* }
|
|
|
|
* }
|
|
|
|
* } </pre>
|
|
|
|
* This factory can now be used like this:
|
|
|
|
* <pre> {@code
|
|
|
|
* StatsTypeAdapterFactory stats = new StatsTypeAdapterFactory();
|
|
|
|
* Gson gson = new GsonBuilder().registerTypeAdapterFactory(stats).create();
|
|
|
|
* // Call gson.toJson() and fromJson methods on objects
|
|
|
|
* System.out.println("Num JSON reads" + stats.numReads);
|
|
|
|
* System.out.println("Num JSON writes" + stats.numWrites);
|
|
|
|
* }</pre>
|
|
|
|
* Note that since you can not override type adapter factories for String and Java primitive
|
|
|
|
* types, our stats factory will not count the number of String or primitives that will be
|
|
|
|
* read or written.
|
|
|
|
* @param skipPast The type adapter factory that needs to be skipped while searching for
|
|
|
|
* a matching type adapter. In most cases, you should just pass <i>this</i> (the type adapter
|
2012-07-02 22:32:38 +02:00
|
|
|
* factory from where {@link #getDelegateAdapter} method is being invoked).
|
2012-04-12 20:49:27 +02:00
|
|
|
* @param type Type for which the delegate adapter is being searched for.
|
|
|
|
*
|
2011-12-31 09:52:59 +01:00
|
|
|
* @since 2.2
|
|
|
|
*/
|
2012-04-12 20:49:27 +02:00
|
|
|
public <T> TypeAdapter<T> getDelegateAdapter(TypeAdapterFactory skipPast, TypeToken<T> type) {
|
2011-12-31 09:52:59 +01:00
|
|
|
boolean skipPastFound = false;
|
2011-12-31 06:30:40 +01:00
|
|
|
|
2011-12-31 09:52:59 +01:00
|
|
|
for (TypeAdapterFactory factory : factories) {
|
|
|
|
if (!skipPastFound) {
|
|
|
|
if (factory == skipPast) {
|
|
|
|
skipPastFound = true;
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
2011-12-31 09:52:59 +01:00
|
|
|
continue;
|
|
|
|
}
|
2011-11-20 16:23:08 +01:00
|
|
|
|
2011-12-31 09:52:59 +01:00
|
|
|
TypeAdapter<T> candidate = factory.create(this, type);
|
|
|
|
if (candidate != null) {
|
|
|
|
return candidate;
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
2011-12-31 09:52:59 +01:00
|
|
|
}
|
|
|
|
throw new IllegalArgumentException("GSON cannot serialize " + type);
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Returns the type adapter for {@code} type.
|
|
|
|
*
|
|
|
|
* @throws IllegalArgumentException if this GSON cannot serialize and
|
|
|
|
* deserialize {@code type}.
|
|
|
|
*/
|
|
|
|
public <T> TypeAdapter<T> getAdapter(Class<T> type) {
|
|
|
|
return getAdapter(TypeToken.get(type));
|
|
|
|
}
|
|
|
|
|
2009-04-03 23:33:01 +02:00
|
|
|
/**
|
2009-10-07 11:23:14 +02:00
|
|
|
* This method serializes the specified object into its equivalent representation as a tree of
|
2009-10-05 20:17:52 +02:00
|
|
|
* {@link JsonElement}s. This method should be used when the specified object is not a generic
|
|
|
|
* type. This method uses {@link Class#getClass()} to get the type for the specified object, but
|
|
|
|
* the {@code getClass()} loses the generic type information because of the Type Erasure feature
|
2009-04-03 23:33:01 +02:00
|
|
|
* of Java. Note that this method works fine if the any of the object fields are of generic type,
|
|
|
|
* just the object itself should not be of a generic type. If the object is of generic type, use
|
2009-10-05 20:17:52 +02:00
|
|
|
* {@link #toJsonTree(Object, Type)} instead.
|
2009-04-03 23:33:01 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which Json representation is to be created setting for Gson
|
|
|
|
* @return Json representation of {@code src}.
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public JsonElement toJsonTree(Object src) {
|
|
|
|
if (src == null) {
|
2011-05-25 18:55:57 +02:00
|
|
|
return JsonNull.INSTANCE;
|
2009-04-03 23:33:01 +02:00
|
|
|
}
|
2009-10-09 03:35:45 +02:00
|
|
|
return toJsonTree(src, src.getClass());
|
2009-04-03 23:33:01 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method serializes the specified object, including those of generic types, into its
|
2009-10-07 11:23:14 +02:00
|
|
|
* equivalent representation as a tree of {@link JsonElement}s. This method must be used if the
|
|
|
|
* specified object is a generic type. For non-generic objects, use {@link #toJsonTree(Object)}
|
|
|
|
* instead.
|
2009-04-03 23:33:01 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which JSON representation is to be created
|
|
|
|
* @param typeOfSrc The specific genericized type of src. You can obtain
|
|
|
|
* this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
|
|
|
|
* to get the type for {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @return Json representation of {@code src}
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public JsonElement toJsonTree(Object src, Type typeOfSrc) {
|
2011-12-30 09:27:24 +01:00
|
|
|
JsonTreeWriter writer = new JsonTreeWriter();
|
2011-10-23 22:28:04 +02:00
|
|
|
toJson(src, typeOfSrc, writer);
|
|
|
|
return writer.get();
|
2009-04-03 23:33:01 +02:00
|
|
|
}
|
|
|
|
|
2008-09-01 05:13:32 +02:00
|
|
|
/**
|
|
|
|
* This method serializes the specified object into its equivalent Json representation.
|
|
|
|
* This method should be used when the specified object is not a generic type. This method uses
|
|
|
|
* {@link Class#getClass()} to get the type for the specified object, but the
|
|
|
|
* {@code getClass()} loses the generic type information because of the Type Erasure feature
|
|
|
|
* of Java. Note that this method works fine if the any of the object fields are of generic type,
|
|
|
|
* just the object itself should not be of a generic type. If the object is of generic type, use
|
|
|
|
* {@link #toJson(Object, Type)} instead. If you want to write out the object to a
|
2008-11-26 20:13:14 +01:00
|
|
|
* {@link Writer}, use {@link #toJson(Object, Appendable)} instead.
|
2008-09-01 05:13:32 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which Json representation is to be created setting for Gson
|
|
|
|
* @return Json representation of {@code src}.
|
|
|
|
*/
|
|
|
|
public String toJson(Object src) {
|
|
|
|
if (src == null) {
|
2011-05-25 18:55:57 +02:00
|
|
|
return toJson(JsonNull.INSTANCE);
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
2009-10-09 03:35:45 +02:00
|
|
|
return toJson(src, src.getClass());
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method serializes the specified object, including those of generic types, into its
|
|
|
|
* equivalent Json representation. This method must be used if the specified object is a generic
|
|
|
|
* type. For non-generic objects, use {@link #toJson(Object)} instead. If you want to write out
|
2008-11-26 20:13:14 +01:00
|
|
|
* the object to a {@link Appendable}, use {@link #toJson(Object, Type, Appendable)} instead.
|
2008-09-01 05:13:32 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which JSON representation is to be created
|
|
|
|
* @param typeOfSrc The specific genericized type of src. You can obtain
|
|
|
|
* this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
|
|
|
|
* to get the type for {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @return Json representation of {@code src}
|
|
|
|
*/
|
|
|
|
public String toJson(Object src, Type typeOfSrc) {
|
|
|
|
StringWriter writer = new StringWriter();
|
2011-09-30 09:08:44 +02:00
|
|
|
toJson(src, typeOfSrc, writer);
|
2008-09-01 05:13:32 +02:00
|
|
|
return writer.toString();
|
|
|
|
}
|
2009-08-07 22:58:41 +02:00
|
|
|
|
2008-09-01 05:13:32 +02:00
|
|
|
/**
|
|
|
|
* This method serializes the specified object into its equivalent Json representation.
|
|
|
|
* This method should be used when the specified object is not a generic type. This method uses
|
|
|
|
* {@link Class#getClass()} to get the type for the specified object, but the
|
|
|
|
* {@code getClass()} loses the generic type information because of the Type Erasure feature
|
|
|
|
* of Java. Note that this method works fine if the any of the object fields are of generic type,
|
|
|
|
* just the object itself should not be of a generic type. If the object is of generic type, use
|
2008-11-26 20:13:14 +01:00
|
|
|
* {@link #toJson(Object, Type, Appendable)} instead.
|
2008-09-01 05:13:32 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which Json representation is to be created setting for Gson
|
|
|
|
* @param writer Writer to which the Json representation needs to be written
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem writing to the writer
|
2008-09-01 05:13:32 +02:00
|
|
|
* @since 1.2
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public void toJson(Object src, Appendable writer) throws JsonIOException {
|
2011-01-22 23:43:43 +01:00
|
|
|
if (src != null) {
|
|
|
|
toJson(src, src.getClass(), writer);
|
|
|
|
} else {
|
2011-05-25 18:55:57 +02:00
|
|
|
toJson(JsonNull.INSTANCE, writer);
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method serializes the specified object, including those of generic types, into its
|
|
|
|
* equivalent Json representation. This method must be used if the specified object is a generic
|
2008-11-26 20:13:14 +01:00
|
|
|
* type. For non-generic objects, use {@link #toJson(Object, Appendable)} instead.
|
2008-09-01 05:13:32 +02:00
|
|
|
*
|
|
|
|
* @param src the object for which JSON representation is to be created
|
|
|
|
* @param typeOfSrc The specific genericized type of src. You can obtain
|
|
|
|
* this type by using the {@link com.google.gson.reflect.TypeToken} class. For example,
|
|
|
|
* to get the type for {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfSrc = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @param writer Writer to which the Json representation of src needs to be written.
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem writing to the writer
|
2008-09-01 05:13:32 +02:00
|
|
|
* @since 1.2
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public void toJson(Object src, Type typeOfSrc, Appendable writer) throws JsonIOException {
|
2011-09-30 09:08:44 +02:00
|
|
|
try {
|
|
|
|
JsonWriter jsonWriter = newJsonWriter(Streams.writerForAppendable(writer));
|
|
|
|
toJson(src, typeOfSrc, jsonWriter);
|
|
|
|
} catch (IOException e) {
|
|
|
|
throw new JsonIOException(e);
|
|
|
|
}
|
2009-08-07 22:58:41 +02:00
|
|
|
}
|
|
|
|
|
2010-09-02 02:15:23 +02:00
|
|
|
/**
|
|
|
|
* Writes the JSON representation of {@code src} of type {@code typeOfSrc} to
|
|
|
|
* {@code writer}.
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem writing to the writer
|
2010-09-02 02:15:23 +02:00
|
|
|
*/
|
2011-09-30 19:08:35 +02:00
|
|
|
@SuppressWarnings("unchecked")
|
2010-11-03 20:46:29 +01:00
|
|
|
public void toJson(Object src, Type typeOfSrc, JsonWriter writer) throws JsonIOException {
|
2011-11-20 16:23:08 +01:00
|
|
|
TypeAdapter<?> adapter = getAdapter(TypeToken.get(typeOfSrc));
|
2011-09-30 09:08:44 +02:00
|
|
|
boolean oldLenient = writer.isLenient();
|
|
|
|
writer.setLenient(true);
|
|
|
|
boolean oldHtmlSafe = writer.isHtmlSafe();
|
|
|
|
writer.setHtmlSafe(htmlSafe);
|
|
|
|
boolean oldSerializeNulls = writer.getSerializeNulls();
|
|
|
|
writer.setSerializeNulls(serializeNulls);
|
|
|
|
try {
|
|
|
|
((TypeAdapter<Object>) adapter).write(writer, src);
|
|
|
|
} catch (IOException e) {
|
|
|
|
throw new JsonIOException(e);
|
|
|
|
} finally {
|
|
|
|
writer.setLenient(oldLenient);
|
|
|
|
writer.setHtmlSafe(oldHtmlSafe);
|
|
|
|
writer.setSerializeNulls(oldSerializeNulls);
|
|
|
|
}
|
2010-09-02 02:15:23 +02:00
|
|
|
}
|
|
|
|
|
2009-08-07 22:58:41 +02:00
|
|
|
/**
|
|
|
|
* Converts a tree of {@link JsonElement}s into its equivalent JSON representation.
|
2009-10-07 11:23:14 +02:00
|
|
|
*
|
2009-10-05 20:17:52 +02:00
|
|
|
* @param jsonElement root of a tree of {@link JsonElement}s
|
2009-08-07 22:58:41 +02:00
|
|
|
* @return JSON String representation of the tree
|
|
|
|
* @since 1.4
|
|
|
|
*/
|
|
|
|
public String toJson(JsonElement jsonElement) {
|
|
|
|
StringWriter writer = new StringWriter();
|
|
|
|
toJson(jsonElement, writer);
|
|
|
|
return writer.toString();
|
|
|
|
}
|
2009-10-07 11:23:14 +02:00
|
|
|
|
2009-08-07 22:58:41 +02:00
|
|
|
/**
|
2009-10-05 20:17:52 +02:00
|
|
|
* Writes out the equivalent JSON for a tree of {@link JsonElement}s.
|
2009-10-07 11:23:14 +02:00
|
|
|
*
|
2009-10-05 20:17:52 +02:00
|
|
|
* @param jsonElement root of a tree of {@link JsonElement}s
|
2009-08-07 22:58:41 +02:00
|
|
|
* @param writer Writer to which the Json representation needs to be written
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem writing to the writer
|
2009-08-07 22:58:41 +02:00
|
|
|
* @since 1.4
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public void toJson(JsonElement jsonElement, Appendable writer) throws JsonIOException {
|
2008-11-26 20:13:14 +01:00
|
|
|
try {
|
2011-09-30 09:08:44 +02:00
|
|
|
JsonWriter jsonWriter = newJsonWriter(Streams.writerForAppendable(writer));
|
2010-11-02 00:03:41 +01:00
|
|
|
toJson(jsonElement, jsonWriter);
|
2009-08-07 22:58:41 +02:00
|
|
|
} catch (IOException e) {
|
|
|
|
throw new RuntimeException(e);
|
2009-10-07 11:23:14 +02:00
|
|
|
}
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
2011-09-30 09:08:44 +02:00
|
|
|
/**
|
|
|
|
* Returns a new JSON writer configured for this GSON and with the non-execute
|
|
|
|
* prefix if that is configured.
|
|
|
|
*/
|
|
|
|
private JsonWriter newJsonWriter(Writer writer) throws IOException {
|
|
|
|
if (generateNonExecutableJson) {
|
|
|
|
writer.write(JSON_NON_EXECUTABLE_PREFIX);
|
|
|
|
}
|
|
|
|
JsonWriter jsonWriter = new JsonWriter(writer);
|
|
|
|
if (prettyPrinting) {
|
|
|
|
jsonWriter.setIndent(" ");
|
|
|
|
}
|
|
|
|
jsonWriter.setSerializeNulls(serializeNulls);
|
|
|
|
return jsonWriter;
|
|
|
|
}
|
|
|
|
|
2010-09-02 02:15:23 +02:00
|
|
|
/**
|
|
|
|
* Writes the JSON for {@code jsonElement} to {@code writer}.
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem writing to the writer
|
2010-09-02 02:15:23 +02:00
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public void toJson(JsonElement jsonElement, JsonWriter writer) throws JsonIOException {
|
2010-09-02 02:15:23 +02:00
|
|
|
boolean oldLenient = writer.isLenient();
|
|
|
|
writer.setLenient(true);
|
|
|
|
boolean oldHtmlSafe = writer.isHtmlSafe();
|
|
|
|
writer.setHtmlSafe(htmlSafe);
|
2011-09-30 09:08:44 +02:00
|
|
|
boolean oldSerializeNulls = writer.getSerializeNulls();
|
|
|
|
writer.setSerializeNulls(serializeNulls);
|
2010-09-02 02:15:23 +02:00
|
|
|
try {
|
2011-10-01 03:10:11 +02:00
|
|
|
Streams.write(jsonElement, writer);
|
2010-09-02 02:15:23 +02:00
|
|
|
} catch (IOException e) {
|
2010-10-19 01:58:09 +02:00
|
|
|
throw new JsonIOException(e);
|
2010-09-02 02:15:23 +02:00
|
|
|
} finally {
|
|
|
|
writer.setLenient(oldLenient);
|
|
|
|
writer.setHtmlSafe(oldHtmlSafe);
|
2011-09-30 09:08:44 +02:00
|
|
|
writer.setSerializeNulls(oldSerializeNulls);
|
2010-09-02 02:15:23 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-09-01 05:13:32 +02:00
|
|
|
/**
|
|
|
|
* This method deserializes the specified Json into an object of the specified class. It is not
|
|
|
|
* suitable to use if the specified class is a generic type since it will not have the generic
|
|
|
|
* type information because of the Type Erasure feature of Java. Therefore, this method should not
|
|
|
|
* be used if the desired type is a generic type. Note that this method works fine if the any of
|
|
|
|
* the fields of the specified object are generics, just the object itself should not be a
|
|
|
|
* generic type. For the cases when the object is of generic type, invoke
|
|
|
|
* {@link #fromJson(String, Type)}. If you have the Json in a {@link Reader} instead of
|
|
|
|
* a String, use {@link #fromJson(Reader, Class)} instead.
|
|
|
|
*
|
|
|
|
* @param <T> the type of the desired object
|
|
|
|
* @param json the string from which the object is to be deserialized
|
|
|
|
* @param classOfT the class of T
|
|
|
|
* @return an object of type T from the string
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type
|
2008-09-01 05:13:32 +02:00
|
|
|
* classOfT
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(String json, Class<T> classOfT) throws JsonSyntaxException {
|
2010-11-01 23:46:20 +01:00
|
|
|
Object object = fromJson(json, (Type) classOfT);
|
2011-03-30 15:59:06 +02:00
|
|
|
return Primitives.wrap(classOfT).cast(object);
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method deserializes the specified Json into an object of the specified type. This method
|
|
|
|
* is useful if the specified object is a generic type. For non-generic objects, use
|
|
|
|
* {@link #fromJson(String, Class)} instead. If you have the Json in a {@link Reader} instead of
|
|
|
|
* a String, use {@link #fromJson(Reader, Type)} instead.
|
|
|
|
*
|
|
|
|
* @param <T> the type of the desired object
|
|
|
|
* @param json the string from which the object is to be deserialized
|
|
|
|
* @param typeOfT The specific genericized type of src. You can obtain this type by using the
|
|
|
|
* {@link com.google.gson.reflect.TypeToken} class. For example, to get the type for
|
|
|
|
* {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfT = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @return an object of type T from the string
|
|
|
|
* @throws JsonParseException if json is not a valid representation for an object of type typeOfT
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type
|
2008-09-01 05:13:32 +02:00
|
|
|
*/
|
|
|
|
@SuppressWarnings("unchecked")
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(String json, Type typeOfT) throws JsonSyntaxException {
|
2010-10-22 18:06:59 +02:00
|
|
|
if (json == null) {
|
|
|
|
return null;
|
|
|
|
}
|
2011-11-13 01:04:39 +01:00
|
|
|
StringReader reader = new StringReader(json);
|
|
|
|
T target = (T) fromJson(reader, typeOfT);
|
|
|
|
return target;
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method deserializes the Json read from the specified reader into an object of the
|
|
|
|
* specified class. It is not suitable to use if the specified class is a generic type since it
|
|
|
|
* will not have the generic type information because of the Type Erasure feature of Java.
|
|
|
|
* Therefore, this method should not be used if the desired type is a generic type. Note that
|
|
|
|
* this method works fine if the any of the fields of the specified object are generics, just the
|
|
|
|
* object itself should not be a generic type. For the cases when the object is of generic type,
|
|
|
|
* invoke {@link #fromJson(Reader, Type)}. If you have the Json in a String form instead of a
|
|
|
|
* {@link Reader}, use {@link #fromJson(String, Class)} instead.
|
|
|
|
*
|
|
|
|
* @param <T> the type of the desired object
|
|
|
|
* @param json the reader producing the Json from which the object is to be deserialized.
|
|
|
|
* @param classOfT the class of T
|
|
|
|
* @return an object of type T from the string
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem reading from the Reader
|
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type
|
2008-09-01 05:13:32 +02:00
|
|
|
* @since 1.2
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(Reader json, Class<T> classOfT) throws JsonSyntaxException, JsonIOException {
|
2010-11-10 03:02:57 +01:00
|
|
|
JsonReader jsonReader = new JsonReader(json);
|
|
|
|
Object object = fromJson(jsonReader, classOfT);
|
2010-11-25 00:22:13 +01:00
|
|
|
assertFullConsumption(object, jsonReader);
|
2011-03-30 15:59:06 +02:00
|
|
|
return Primitives.wrap(classOfT).cast(object);
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method deserializes the Json read from the specified reader into an object of the
|
|
|
|
* specified type. This method is useful if the specified object is a generic type. For
|
|
|
|
* non-generic objects, use {@link #fromJson(Reader, Class)} instead. If you have the Json in a
|
|
|
|
* String form instead of a {@link Reader}, use {@link #fromJson(String, Type)} instead.
|
|
|
|
*
|
|
|
|
* @param <T> the type of the desired object
|
|
|
|
* @param json the reader producing Json from which the object is to be deserialized
|
|
|
|
* @param typeOfT The specific genericized type of src. You can obtain this type by using the
|
|
|
|
* {@link com.google.gson.reflect.TypeToken} class. For example, to get the type for
|
|
|
|
* {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfT = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @return an object of type T from the json
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonIOException if there was a problem reading from the Reader
|
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type
|
2008-09-01 05:13:32 +02:00
|
|
|
* @since 1.2
|
|
|
|
*/
|
2011-12-04 11:24:07 +01:00
|
|
|
@SuppressWarnings("unchecked")
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(Reader json, Type typeOfT) throws JsonIOException, JsonSyntaxException {
|
2010-11-10 03:02:57 +01:00
|
|
|
JsonReader jsonReader = new JsonReader(json);
|
2011-11-13 21:04:29 +01:00
|
|
|
T object = (T) fromJson(jsonReader, typeOfT);
|
2010-11-25 00:22:13 +01:00
|
|
|
assertFullConsumption(object, jsonReader);
|
|
|
|
return object;
|
|
|
|
}
|
|
|
|
|
|
|
|
private static void assertFullConsumption(Object obj, JsonReader reader) {
|
|
|
|
try {
|
|
|
|
if (obj != null && reader.peek() != JsonToken.END_DOCUMENT) {
|
|
|
|
throw new JsonIOException("JSON document was not fully consumed.");
|
|
|
|
}
|
|
|
|
} catch (MalformedJsonException e) {
|
|
|
|
throw new JsonSyntaxException(e);
|
|
|
|
} catch (IOException e) {
|
|
|
|
throw new JsonIOException(e);
|
|
|
|
}
|
2010-09-02 02:15:23 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Reads the next JSON value from {@code reader} and convert it to an object
|
|
|
|
* of type {@code typeOfT}.
|
2010-11-03 20:46:29 +01:00
|
|
|
* Since Type is not parameterized by T, this method is type unsafe and should be used carefully
|
|
|
|
*
|
|
|
|
* @throws JsonIOException if there was a problem writing to the Reader
|
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type
|
2010-09-02 02:15:23 +02:00
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
@SuppressWarnings("unchecked")
|
|
|
|
public <T> T fromJson(JsonReader reader, Type typeOfT) throws JsonIOException, JsonSyntaxException {
|
2011-09-11 09:04:56 +02:00
|
|
|
boolean isEmpty = true;
|
2010-09-02 02:15:23 +02:00
|
|
|
boolean oldLenient = reader.isLenient();
|
|
|
|
reader.setLenient(true);
|
|
|
|
try {
|
2011-09-11 09:04:56 +02:00
|
|
|
reader.peek();
|
|
|
|
isEmpty = false;
|
2012-10-11 05:20:36 +02:00
|
|
|
TypeToken<T> typeToken = (TypeToken<T>) TypeToken.get(typeOfT);
|
2012-10-23 04:40:14 +02:00
|
|
|
TypeAdapter<T> typeAdapter = getAdapter(typeToken);
|
2012-10-11 05:20:36 +02:00
|
|
|
T object = typeAdapter.read(reader);
|
|
|
|
return object;
|
2011-09-11 09:04:56 +02:00
|
|
|
} catch (EOFException e) {
|
|
|
|
/*
|
|
|
|
* For compatibility with JSON 1.5 and earlier, we return null for empty
|
|
|
|
* documents instead of throwing.
|
|
|
|
*/
|
|
|
|
if (isEmpty) {
|
|
|
|
return null;
|
|
|
|
}
|
|
|
|
throw new JsonSyntaxException(e);
|
2011-10-24 03:32:46 +02:00
|
|
|
} catch (IllegalStateException e) {
|
|
|
|
throw new JsonSyntaxException(e);
|
2011-08-19 05:13:06 +02:00
|
|
|
} catch (IOException e) {
|
|
|
|
// TODO(inder): Figure out whether it is indeed right to rethrow this as JsonSyntaxException
|
|
|
|
throw new JsonSyntaxException(e);
|
2010-09-02 02:15:23 +02:00
|
|
|
} finally {
|
|
|
|
reader.setLenient(oldLenient);
|
|
|
|
}
|
2009-02-04 02:56:28 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method deserializes the Json read from the specified parse tree into an object of the
|
|
|
|
* specified type. It is not suitable to use if the specified class is a generic type since it
|
|
|
|
* will not have the generic type information because of the Type Erasure feature of Java.
|
|
|
|
* Therefore, this method should not be used if the desired type is a generic type. Note that
|
|
|
|
* this method works fine if the any of the fields of the specified object are generics, just the
|
|
|
|
* object itself should not be a generic type. For the cases when the object is of generic type,
|
2009-10-07 11:23:14 +02:00
|
|
|
* invoke {@link #fromJson(JsonElement, Type)}.
|
2009-02-04 02:56:28 +01:00
|
|
|
* @param <T> the type of the desired object
|
2009-10-07 11:23:14 +02:00
|
|
|
* @param json the root of the parse tree of {@link JsonElement}s from which the object is to
|
2009-02-04 02:56:28 +01:00
|
|
|
* be deserialized
|
|
|
|
* @param classOfT The class of T
|
|
|
|
* @return an object of type T from the json
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type typeOfT
|
2009-02-04 02:56:28 +01:00
|
|
|
* @since 1.3
|
|
|
|
*/
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(JsonElement json, Class<T> classOfT) throws JsonSyntaxException {
|
2010-11-01 23:46:20 +01:00
|
|
|
Object object = fromJson(json, (Type) classOfT);
|
2011-03-30 15:59:06 +02:00
|
|
|
return Primitives.wrap(classOfT).cast(object);
|
2009-02-04 02:56:28 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* This method deserializes the Json read from the specified parse tree into an object of the
|
|
|
|
* specified type. This method is useful if the specified object is a generic type. For
|
2009-10-07 11:23:14 +02:00
|
|
|
* non-generic objects, use {@link #fromJson(JsonElement, Class)} instead.
|
2009-02-04 02:56:28 +01:00
|
|
|
*
|
|
|
|
* @param <T> the type of the desired object
|
2009-10-07 11:23:14 +02:00
|
|
|
* @param json the root of the parse tree of {@link JsonElement}s from which the object is to
|
2009-02-04 02:56:28 +01:00
|
|
|
* be deserialized
|
|
|
|
* @param typeOfT The specific genericized type of src. You can obtain this type by using the
|
|
|
|
* {@link com.google.gson.reflect.TypeToken} class. For example, to get the type for
|
|
|
|
* {@code Collection<Foo>}, you should use:
|
|
|
|
* <pre>
|
|
|
|
* Type typeOfT = new TypeToken<Collection<Foo>>(){}.getType();
|
|
|
|
* </pre>
|
|
|
|
* @return an object of type T from the json
|
2010-11-03 20:46:29 +01:00
|
|
|
* @throws JsonSyntaxException if json is not a valid representation for an object of type typeOfT
|
2009-02-04 02:56:28 +01:00
|
|
|
* @since 1.3
|
|
|
|
*/
|
2011-12-04 11:24:07 +01:00
|
|
|
@SuppressWarnings("unchecked")
|
2010-11-03 20:46:29 +01:00
|
|
|
public <T> T fromJson(JsonElement json, Type typeOfT) throws JsonSyntaxException {
|
2009-05-14 22:18:45 +02:00
|
|
|
if (json == null) {
|
|
|
|
return null;
|
|
|
|
}
|
2011-12-03 03:37:27 +01:00
|
|
|
return (T) fromJson(new JsonTreeReader(json), typeOfT);
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|
|
|
|
|
2011-11-20 16:23:08 +01:00
|
|
|
static class FutureTypeAdapter<T> extends TypeAdapter<T> {
|
|
|
|
private TypeAdapter<T> delegate;
|
|
|
|
|
|
|
|
public void setDelegate(TypeAdapter<T> typeAdapter) {
|
|
|
|
if (delegate != null) {
|
|
|
|
throw new AssertionError();
|
|
|
|
}
|
|
|
|
delegate = typeAdapter;
|
|
|
|
}
|
|
|
|
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public T read(JsonReader in) throws IOException {
|
2011-11-20 16:23:08 +01:00
|
|
|
if (delegate == null) {
|
|
|
|
throw new IllegalStateException();
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
return delegate.read(in);
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
|
|
|
|
2011-12-03 20:46:25 +01:00
|
|
|
@Override public void write(JsonWriter out, T value) throws IOException {
|
2011-11-20 16:23:08 +01:00
|
|
|
if (delegate == null) {
|
|
|
|
throw new IllegalStateException();
|
|
|
|
}
|
2011-12-03 20:46:25 +01:00
|
|
|
delegate.write(out, value);
|
2011-11-20 16:23:08 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-10-07 11:23:14 +02:00
|
|
|
@Override
|
2008-09-16 20:28:31 +02:00
|
|
|
public String toString() {
|
2014-03-09 09:36:24 +01:00
|
|
|
return new StringBuilder("{serializeNulls:")
|
|
|
|
.append(serializeNulls)
|
|
|
|
.append("factories:").append(factories)
|
2011-09-11 09:04:56 +02:00
|
|
|
.append(",instanceCreators:").append(constructorConstructor)
|
2012-12-20 20:41:33 +01:00
|
|
|
.append("}")
|
|
|
|
.toString();
|
2008-09-16 20:28:31 +02:00
|
|
|
}
|
2014-03-09 09:36:24 +01:00
|
|
|
|
|
|
|
public static final class $$Internal {
|
|
|
|
public static void addGeneratedTypeAdapter(Gson gson, TypeAdapter<?> typeAdapter) {
|
2014-03-10 00:00:53 +01:00
|
|
|
if (gson.inConstructorPhase) {
|
|
|
|
gson.preconfiguredGeneratedTypeAdapters.add(typeAdapter);
|
|
|
|
} else {
|
|
|
|
Set<TypeAdapter<?>> adapters = getRuntimeGeneratedTypeAdapters(gson);
|
|
|
|
adapters.add(typeAdapter);
|
|
|
|
}
|
2014-03-09 09:36:24 +01:00
|
|
|
}
|
|
|
|
public static boolean isGeneratedTypeAdapter(Gson gson, TypeAdapter<?> typeAdapter) {
|
2014-03-10 00:00:53 +01:00
|
|
|
boolean generated = gson.preconfiguredGeneratedTypeAdapters.contains(typeAdapter);
|
|
|
|
if (!generated) generated = getRuntimeGeneratedTypeAdapters(gson).contains(typeAdapter);
|
|
|
|
return generated;
|
|
|
|
}
|
|
|
|
private static Set<TypeAdapter<?>> getRuntimeGeneratedTypeAdapters(Gson gson) {
|
|
|
|
Set<TypeAdapter<?>> adapters = gson.runtimeGeneratedTypeAdapters.get();
|
|
|
|
if (adapters == null) adapters = new HashSet<TypeAdapter<?>>();
|
|
|
|
gson.runtimeGeneratedTypeAdapters.set(adapters);
|
|
|
|
return adapters;
|
2014-03-09 09:36:24 +01:00
|
|
|
}
|
|
|
|
}
|
2008-09-01 05:13:32 +02:00
|
|
|
}
|