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/*
* Copyright (C) 2010 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.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.Arrays;
import junit.framework.TestCase;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Functional test for Gson serialization and deserialization of
* classes with type variables.
*
* @author Joel Leitch
*/
public class TypeVariableTest extends TestCase {
public void testAdvancedTypeVariables() throws Exception {
Gson gson = new Gson();
Bar bar1 = new Bar("someString", 1, true);
ArrayList<Integer> arrayList = new ArrayList<Integer>();
arrayList.add(1);
arrayList.add(2);
arrayList.add(3);
bar1.map.put("key1", arrayList);
bar1.map.put("key2", new ArrayList<Integer>());
String json = gson.toJson(bar1);
Bar bar2 = gson.fromJson(json, Bar.class);
assertEquals(bar1, bar2);
}
public void testTypeVariablesViaTypeParameter() throws Exception {
Gson gson = new Gson();
Foo<String, Integer> original = new Foo<String, Integer>("e", 5, false);
original.map.put("f", Arrays.asList(6, 7));
Type type = new TypeToken<Foo<String, Integer>>() {}.getType();
String json = gson.toJson(original, type);
assertEquals("{\"someSField\":\"e\",\"someTField\":5,\"map\":{\"f\":[6,7]},\"redField\":false}",
json);
assertEquals(original, gson.<Foo<String, Integer>>fromJson(json, type));
}
public void testBasicTypeVariables() throws Exception {
Gson gson = new Gson();
Blue blue1 = new Blue(true);
String json = gson.toJson(blue1);
Blue blue2 = gson.fromJson(json, Blue.class);
assertEquals(blue1, blue2);
}
public static class Blue extends Red<Boolean> {
public Blue() {
super(false);
}
public Blue(boolean value) {
super(value);
}
// Technically, we should implement hashcode too
@Override
public boolean equals(Object o) {
if (!(o instanceof Blue)) {
return false;
}
Blue blue = (Blue) o;
return redField.equals(blue.redField);
}
}
public static class Red<S> {
protected S redField;
public Red() {}
public Red(S redField) {
this.redField = redField;
}
}
public static class Foo<S, T> extends Red<Boolean> {
private S someSField;
private T someTField;
public final Map<S, List<T>> map = new HashMap<S, List<T>>();
public Foo() {}
public Foo(S sValue, T tValue, Boolean redField) {
super(redField);
this.someSField = sValue;
this.someTField = tValue;
}
// Technically, we should implement hashcode too
@Override
@SuppressWarnings("unchecked")
public boolean equals(Object o) {
if (!(o instanceof Foo<?, ?>)) {
return false;
}
Foo<S, T> realFoo = (Foo<S, T>) o;
return redField.equals(realFoo.redField)
&& someTField.equals(realFoo.someTField)
&& someSField.equals(realFoo.someSField)
&& map.equals(realFoo.map);
}
}
public static class Bar extends Foo<String, Integer> {
public Bar() {
this("", 0, false);
}
public Bar(String s, Integer i, boolean b) {
super(s, i, b);
}
}
}
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