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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 java.lang.reflect.Type;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.InstanceCreator;
import com.google.gson.annotations.Expose;
import junit.framework.TestCase;
/**
* Unit tests for the regarding functional "@Expose" type tests.
*
* @author Joel Leitch
*/
public class ExposeFieldsTest extends TestCase {
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
gson = new GsonBuilder()
.excludeFieldsWithoutExposeAnnotation()
.registerTypeAdapter(SomeInterface.class, new SomeInterfaceInstanceCreator())
.create();
}
public void testNullExposeFieldSerialization() throws Exception {
ClassWithExposedFields object = new ClassWithExposedFields(null, 1);
String json = gson.toJson(object);
assertEquals(object.getExpectedJson(), json);
}
public void testArrayWithOneNullExposeFieldObjectSerialization() throws Exception {
ClassWithExposedFields object1 = new ClassWithExposedFields(1, 1);
ClassWithExposedFields object2 = new ClassWithExposedFields(null, 1);
ClassWithExposedFields object3 = new ClassWithExposedFields(2, 2);
ClassWithExposedFields[] objects = { object1, object2, object3 };
String json = gson.toJson(objects);
String expected = new StringBuilder()
.append('[').append(object1.getExpectedJson()).append(',')
.append(object2.getExpectedJson()).append(',')
.append(object3.getExpectedJson()).append(']')
.toString();
assertEquals(expected, json);
}
public void testExposeAnnotationSerialization() throws Exception {
ClassWithExposedFields target = new ClassWithExposedFields(1, 2);
assertEquals(target.getExpectedJson(), gson.toJson(target));
}
public void testExposeAnnotationDeserialization() throws Exception {
String json = "{a:3,b:4,d:20.0}";
ClassWithExposedFields target = gson.fromJson(json, ClassWithExposedFields.class);
assertEquals(3, (int) target.a);
assertNull(target.b);
assertFalse(target.d == 20);
}
public void testNoExposedFieldSerialization() throws Exception {
ClassWithNoExposedFields obj = new ClassWithNoExposedFields();
String json = gson.toJson(obj);
assertEquals("{}", json);
}
public void testNoExposedFieldDeserialization() throws Exception {
String json = "{a:4,b:5}";
ClassWithNoExposedFields obj = gson.fromJson(json, ClassWithNoExposedFields.class);
assertEquals(0, obj.a);
assertEquals(1, obj.b);
}
public void testExposedInterfaceFieldSerialization() throws Exception {
String expected = "{\"interfaceField\":{}}";
ClassWithInterfaceField target = new ClassWithInterfaceField(new SomeObject());
String actual = gson.toJson(target);
assertEquals(expected, actual);
}
public void testExposedInterfaceFieldDeserialization() throws Exception {
String json = "{\"interfaceField\":{}}";
ClassWithInterfaceField obj = gson.fromJson(json, ClassWithInterfaceField.class);
assertNotNull(obj.interfaceField);
}
private static class ClassWithExposedFields {
@Expose private final Integer a;
private final Integer b;
@Expose(serialize = false) final long c;
@Expose(deserialize = false) final double d;
@Expose(serialize = false, deserialize = false) final char e;
public ClassWithExposedFields(Integer a, Integer b) {
this(a, b, 1L, 2.0, 'a');
}
public ClassWithExposedFields(Integer a, Integer b, long c, double d, char e) {
this.a = a;
this.b = b;
this.c = c;
this.d = d;
this.e = e;
}
public String getExpectedJson() {
StringBuilder sb = new StringBuilder("{");
if (a != null) {
sb.append("\"a\":").append(a).append(",");
}
sb.append("\"d\":").append(d);
sb.append("}");
return sb.toString();
}
}
private static class ClassWithNoExposedFields {
private final int a = 0;
private final int b = 1;
}
private static interface SomeInterface {
// Empty interface
}
private static class SomeObject implements SomeInterface {
// Do nothing
}
private static class SomeInterfaceInstanceCreator implements InstanceCreator<SomeInterface> {
public SomeInterface createInstance(Type type) {
return new SomeObject();
}
}
private static class ClassWithInterfaceField {
@Expose
private final SomeInterface interfaceField;
public ClassWithInterfaceField(SomeInterface interfaceField) {
this.interfaceField = interfaceField;
}
}
}
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