237 lines
8.5 KiB
Java
237 lines
8.5 KiB
Java
/*
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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.functional;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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import com.google.gson.JsonElement;
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import com.google.gson.JsonNull;
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import com.google.gson.JsonObject;
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import com.google.gson.JsonDeserializationContext;
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import com.google.gson.JsonDeserializer;
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import com.google.gson.JsonSerializationContext;
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import com.google.gson.JsonSerializer;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import com.google.gson.common.TestTypes.ClassWithObjects;
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import junit.framework.TestCase;
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import java.lang.reflect.Type;
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import java.util.Collection;
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/**
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* Functional tests for the different cases for serializing (or ignoring) null fields and object.
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*
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* @author Inderjeet Singh
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* @author Joel Leitch
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*/
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public class NullObjectAndFieldTest extends TestCase {
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private GsonBuilder gsonBuilder;
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@Override
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protected void setUp() throws Exception {
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super.setUp();
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gsonBuilder = new GsonBuilder().serializeNulls();
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}
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public void testTopLevelNullObjectSerialization() {
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Gson gson = gsonBuilder.create();
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String actual = gson.toJson(null);
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assertEquals("null", actual);
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actual = gson.toJson(null, String.class);
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assertEquals("null", actual);
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}
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public void testTopLevelNullObjectDeserialization() throws Exception {
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Gson gson = gsonBuilder.create();
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String actual = gson.fromJson("null", String.class);
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assertNull(actual);
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}
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public void testExplicitSerializationOfNulls() {
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Gson gson = gsonBuilder.create();
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ClassWithObjects target = new ClassWithObjects(null);
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String actual = gson.toJson(target);
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String expected = "{\"bag\":null}";
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assertEquals(expected, actual);
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}
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public void testExplicitDeserializationOfNulls() throws Exception {
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Gson gson = gsonBuilder.create();
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ClassWithObjects target = gson.fromJson("{\"bag\":null}", ClassWithObjects.class);
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assertNull(target.bag);
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}
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public void testExplicitSerializationOfNullArrayMembers() {
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Gson gson = gsonBuilder.create();
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ClassWithMembers target = new ClassWithMembers();
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String json = gson.toJson(target);
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assertTrue(json.contains("\"array\":null"));
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}
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/**
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* Added to verify http://code.google.com/p/google-gson/issues/detail?id=68
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*/
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public void testNullWrappedPrimitiveMemberSerialization() {
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Gson gson = gsonBuilder.serializeNulls().create();
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ClassWithNullWrappedPrimitive target = new ClassWithNullWrappedPrimitive();
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String json = gson.toJson(target);
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assertTrue(json.contains("\"value\":null"));
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}
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/**
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* Added to verify http://code.google.com/p/google-gson/issues/detail?id=68
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*/
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public void testNullWrappedPrimitiveMemberDeserialization() {
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Gson gson = gsonBuilder.create();
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String json = "{\"value\":null}";
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ClassWithNullWrappedPrimitive target = gson.fromJson(json, ClassWithNullWrappedPrimitive.class);
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assertNull(target.value);
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}
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public void testExplicitSerializationOfNullCollectionMembers() {
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Gson gson = gsonBuilder.create();
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ClassWithMembers target = new ClassWithMembers();
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String json = gson.toJson(target);
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assertTrue(json.contains("\"col\":null"));
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}
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public void testExplicitSerializationOfNullStringMembers() {
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Gson gson = gsonBuilder.create();
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ClassWithMembers target = new ClassWithMembers();
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String json = gson.toJson(target);
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assertTrue(json.contains("\"str\":null"));
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}
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public void testCustomSerializationOfNulls() {
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gsonBuilder.registerTypeAdapter(ClassWithObjects.class, new ClassWithObjectsSerializer());
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Gson gson = gsonBuilder.create();
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ClassWithObjects target = new ClassWithObjects(new BagOfPrimitives());
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String actual = gson.toJson(target);
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String expected = "{\"bag\":null}";
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assertEquals(expected, actual);
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}
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public void testPrintPrintingObjectWithNulls() throws Exception {
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gsonBuilder = new GsonBuilder();
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Gson gson = gsonBuilder.create();
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String result = gson.toJson(new ClassWithMembers());
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assertEquals("{}", result);
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gson = gsonBuilder.serializeNulls().create();
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result = gson.toJson(new ClassWithMembers());
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assertTrue(result.contains("\"str\":null"));
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}
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public void testPrintPrintingArraysWithNulls() throws Exception {
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gsonBuilder = new GsonBuilder();
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Gson gson = gsonBuilder.create();
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String result = gson.toJson(new String[] { "1", null, "3" });
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assertEquals("[\"1\",null,\"3\"]", result);
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gson = gsonBuilder.serializeNulls().create();
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result = gson.toJson(new String[] { "1", null, "3" });
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assertEquals("[\"1\",null,\"3\"]", result);
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}
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// test for issue 389
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public void testAbsentJsonElementsAreSetToNull() {
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Gson gson = new Gson();
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ClassWithInitializedMembers target =
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gson.fromJson("{array:[1,2,3]}", ClassWithInitializedMembers.class);
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assertTrue(target.array.length == 3 && target.array[1] == 2);
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assertEquals(ClassWithInitializedMembers.MY_STRING_DEFAULT, target.str1);
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assertNull(target.str2);
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assertEquals(ClassWithInitializedMembers.MY_INT_DEFAULT, target.int1);
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assertEquals(0, target.int2); // test the default value of a primitive int field per JVM spec
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assertEquals(ClassWithInitializedMembers.MY_BOOLEAN_DEFAULT, target.bool1);
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assertFalse(target.bool2); // test the default value of a primitive boolean field per JVM spec
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}
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public static class ClassWithInitializedMembers {
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// Using a mix of no-args constructor and field initializers
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// Also, some fields are intialized and some are not (so initialized per JVM spec)
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public static final String MY_STRING_DEFAULT = "string";
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private static final int MY_INT_DEFAULT = 2;
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private static final boolean MY_BOOLEAN_DEFAULT = true;
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int[] array;
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String str1, str2;
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int int1 = MY_INT_DEFAULT;
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int int2;
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boolean bool1 = MY_BOOLEAN_DEFAULT;
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boolean bool2;
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public ClassWithInitializedMembers() {
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str1 = MY_STRING_DEFAULT;
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}
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}
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private static class ClassWithNullWrappedPrimitive {
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private Long value;
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}
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@SuppressWarnings("unused")
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private static class ClassWithMembers {
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String str;
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int[] array;
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Collection<String> col;
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}
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private static class ClassWithObjectsSerializer implements JsonSerializer<ClassWithObjects> {
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@Override public JsonElement serialize(ClassWithObjects src, Type typeOfSrc,
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JsonSerializationContext context) {
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JsonObject obj = new JsonObject();
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obj.add("bag", JsonNull.INSTANCE);
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return obj;
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}
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}
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public void testExplicitNullSetsFieldToNullDuringDeserialization() {
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Gson gson = new Gson();
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String json = "{value:null}";
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ObjectWithField obj = gson.fromJson(json, ObjectWithField.class);
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assertNull(obj.value);
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}
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public void testCustomTypeAdapterPassesNullSerialization() {
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Gson gson = new GsonBuilder()
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.registerTypeAdapter(ObjectWithField.class, new JsonSerializer<ObjectWithField>() {
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@Override public JsonElement serialize(ObjectWithField src, Type typeOfSrc,
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JsonSerializationContext context) {
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return context.serialize(null);
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}
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}).create();
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ObjectWithField target = new ObjectWithField();
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target.value = "value1";
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String json = gson.toJson(target);
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assertFalse(json.contains("value1"));
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}
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public void testCustomTypeAdapterPassesNullDesrialization() {
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Gson gson = new GsonBuilder()
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.setLenient()
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.registerTypeAdapter(ObjectWithField.class, (JsonDeserializer<ObjectWithField>) (json, type, context) -> context.deserialize(null, type)).create();
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String json = "{value:'value1'}";
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ObjectWithField target = gson.fromJson(json, ObjectWithField.class);
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assertNull(target);
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}
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private static class ObjectWithField {
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String value = "";
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}
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}
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