gson-comments/gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java

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/*
* Copyright (C) 2008 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gson.functional;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonNull;
import com.google.gson.JsonObject;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
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import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.common.TestTypes.BagOfPrimitives;
import com.google.gson.common.TestTypes.ClassWithObjects;
import junit.framework.TestCase;
import java.lang.reflect.Type;
import java.util.Collection;
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/**
* Functional tests for the different cases for serializing (or ignoring) null fields and object.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public class NullObjectAndFieldTest extends TestCase {
private GsonBuilder gsonBuilder;
@Override
protected void setUp() throws Exception {
super.setUp();
gsonBuilder = new GsonBuilder().serializeNulls();
}
public void testTopLevelNullObjectSerialization() {
Gson gson = gsonBuilder.create();
String actual = gson.toJson(null);
assertEquals("null", actual);
actual = gson.toJson(null, String.class);
assertEquals("null", actual);
}
public void testTopLevelNullObjectDeserialization() throws Exception {
Gson gson = gsonBuilder.create();
String actual = gson.fromJson("null", String.class);
assertNull(actual);
}
public void testExplicitSerializationOfNulls() {
Gson gson = gsonBuilder.create();
ClassWithObjects target = new ClassWithObjects(null);
String actual = gson.toJson(target);
String expected = "{\"bag\":null}";
assertEquals(expected, actual);
}
public void testExplicitDeserializationOfNulls() throws Exception {
Gson gson = gsonBuilder.create();
ClassWithObjects target = gson.fromJson("{\"bag\":null}", ClassWithObjects.class);
assertNull(target.bag);
}
public void testExplicitSerializationOfNullArrayMembers() {
Gson gson = gsonBuilder.create();
ClassWithMembers target = new ClassWithMembers();
String json = gson.toJson(target);
assertTrue(json.contains("\"array\":null"));
}
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/**
* Added to verify http://code.google.com/p/google-gson/issues/detail?id=68
*/
public void testNullWrappedPrimitiveMemberSerialization() {
Gson gson = gsonBuilder.serializeNulls().create();
ClassWithNullWrappedPrimitive target = new ClassWithNullWrappedPrimitive();
String json = gson.toJson(target);
assertTrue(json.contains("\"value\":null"));
}
/**
* Added to verify http://code.google.com/p/google-gson/issues/detail?id=68
*/
public void testNullWrappedPrimitiveMemberDeserialization() {
Gson gson = gsonBuilder.create();
String json = "{'value':null}";
ClassWithNullWrappedPrimitive target = gson.fromJson(json, ClassWithNullWrappedPrimitive.class);
assertNull(target.value);
}
public void testExplicitSerializationOfNullCollectionMembers() {
Gson gson = gsonBuilder.create();
ClassWithMembers target = new ClassWithMembers();
String json = gson.toJson(target);
assertTrue(json.contains("\"col\":null"));
}
public void testExplicitSerializationOfNullStringMembers() {
Gson gson = gsonBuilder.create();
ClassWithMembers target = new ClassWithMembers();
String json = gson.toJson(target);
assertTrue(json.contains("\"str\":null"));
}
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public void testCustomSerializationOfNulls() {
gsonBuilder.registerTypeAdapter(ClassWithObjects.class, new ClassWithObjectsSerializer());
Gson gson = gsonBuilder.create();
ClassWithObjects target = new ClassWithObjects(new BagOfPrimitives());
String actual = gson.toJson(target);
String expected = "{\"bag\":null}";
assertEquals(expected, actual);
}
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public void testPrintPrintingObjectWithNulls() throws Exception {
gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
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String result = gson.toJson(new ClassWithMembers());
assertEquals("{}", result);
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gson = gsonBuilder.serializeNulls().create();
result = gson.toJson(new ClassWithMembers());
assertTrue(result.contains("\"str\":null"));
}
public void testPrintPrintingArraysWithNulls() throws Exception {
gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
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String result = gson.toJson(new String[] { "1", null, "3" });
assertEquals("[\"1\",null,\"3\"]", result);
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gson = gsonBuilder.serializeNulls().create();
result = gson.toJson(new String[] { "1", null, "3" });
assertEquals("[\"1\",null,\"3\"]", result);
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}
private static class ClassWithNullWrappedPrimitive {
private Long value;
}
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@SuppressWarnings("unused")
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private static class ClassWithMembers {
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String str;
int[] array;
Collection<String> col;
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}
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private static class ClassWithObjectsSerializer implements JsonSerializer<ClassWithObjects> {
public JsonElement serialize(ClassWithObjects src, Type typeOfSrc,
JsonSerializationContext context) {
JsonObject obj = new JsonObject();
obj.add("bag", new JsonNull());
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return obj;
}
}
public void testExplicitNullSetsFieldToNullDuringDeserialization() {
Gson gson = new Gson();
String json = "{value:null}";
ObjectWithField obj = gson.fromJson(json, ObjectWithField.class);
assertNull(obj.value);
}
public void testCustomTypeAdapterPassesNullSerialization() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(ObjectWithField.class, new JsonSerializer<ObjectWithField>() {
public JsonElement serialize(ObjectWithField src, Type typeOfSrc,
JsonSerializationContext context) {
return context.serialize(null);
}
}).create();
ObjectWithField target = new ObjectWithField();
target.value = "value1";
String json = gson.toJson(target);
assertFalse(json.contains("value1"));
}
public void testCustomTypeAdapterPassesNullDesrialization() {
Gson gson = new GsonBuilder()
.registerTypeAdapter(ObjectWithField.class, new JsonDeserializer<ObjectWithField>() {
public ObjectWithField deserialize(JsonElement json, Type type,
JsonDeserializationContext context) {
return context.deserialize(null, type);
}
}).create();
String json = "{value:'value1'}";
ObjectWithField target = gson.fromJson(json, ObjectWithField.class);
assertNull(target);
}
private static class ObjectWithField {
String value = "";
}
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}