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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.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.google.gson.annotations.SerializedName;
import com.google.gson.common.MoreAsserts;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumSet;
import java.util.Set;
import junit.framework.TestCase;
/**
* Functional tests for Java 5.0 enums.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public class EnumTest extends TestCase {
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
gson = new Gson();
}
public void testTopLevelEnumSerialization() throws Exception {
String result = gson.toJson(MyEnum.VALUE1);
assertEquals('"' + MyEnum.VALUE1.toString() + '"', result);
}
public void testTopLevelEnumDeserialization() throws Exception {
MyEnum result = gson.fromJson('"' + MyEnum.VALUE1.toString() + '"', MyEnum.class);
assertEquals(MyEnum.VALUE1, result);
}
public void testCollectionOfEnumsSerialization() {
Type type = new TypeToken<Collection<MyEnum>>() {}.getType();
Collection<MyEnum> target = new ArrayList<MyEnum>();
target.add(MyEnum.VALUE1);
target.add(MyEnum.VALUE2);
String expectedJson = "[\"VALUE1\",\"VALUE2\"]";
String actualJson = gson.toJson(target);
assertEquals(expectedJson, actualJson);
actualJson = gson.toJson(target, type);
assertEquals(expectedJson, actualJson);
}
public void testCollectionOfEnumsDeserialization() {
Type type = new TypeToken<Collection<MyEnum>>() {}.getType();
String json = "[\"VALUE1\",\"VALUE2\"]";
Collection<MyEnum> target = gson.fromJson(json, type);
MoreAsserts.assertContains(target, MyEnum.VALUE1);
MoreAsserts.assertContains(target, MyEnum.VALUE2);
}
public void testClassWithEnumFieldSerialization() throws Exception {
ClassWithEnumFields target = new ClassWithEnumFields();
assertEquals(target.getExpectedJson(), gson.toJson(target));
}
public void testClassWithEnumFieldDeserialization() throws Exception {
String json = "{value1:'VALUE1',value2:'VALUE2'}";
ClassWithEnumFields target = gson.fromJson(json, ClassWithEnumFields.class);
assertEquals(MyEnum.VALUE1,target.value1);
assertEquals(MyEnum.VALUE2,target.value2);
}
private static enum MyEnum {
VALUE1, VALUE2
}
private static class ClassWithEnumFields {
private final MyEnum value1 = MyEnum.VALUE1;
private final MyEnum value2 = MyEnum.VALUE2;
public String getExpectedJson() {
return "{\"value1\":\"" + value1 + "\",\"value2\":\"" + value2 + "\"}";
}
}
/**
* Test for issue 226.
*/
public void testEnumSubclass() {
assertFalse(Roshambo.class == Roshambo.ROCK.getClass());
assertEquals("\"ROCK\"", gson.toJson(Roshambo.ROCK));
assertEquals("[\"ROCK\",\"PAPER\",\"SCISSORS\"]", gson.toJson(EnumSet.allOf(Roshambo.class)));
assertEquals(Roshambo.ROCK, gson.fromJson("\"ROCK\"", Roshambo.class));
assertEquals(EnumSet.allOf(Roshambo.class),
gson.fromJson("[\"ROCK\",\"PAPER\",\"SCISSORS\"]", new TypeToken<Set<Roshambo>>() {}.getType()));
}
public void testEnumSubclassWithRegisteredTypeAdapter() {
gson = new GsonBuilder()
.registerTypeHierarchyAdapter(Roshambo.class, new MyEnumTypeAdapter())
.create();
assertFalse(Roshambo.class == Roshambo.ROCK.getClass());
assertEquals("\"123ROCK\"", gson.toJson(Roshambo.ROCK));
assertEquals("[\"123ROCK\",\"123PAPER\",\"123SCISSORS\"]", gson.toJson(EnumSet.allOf(Roshambo.class)));
assertEquals(Roshambo.ROCK, gson.fromJson("\"123ROCK\"", Roshambo.class));
assertEquals(EnumSet.allOf(Roshambo.class),
gson.fromJson("[\"123ROCK\",\"123PAPER\",\"123SCISSORS\"]", new TypeToken<Set<Roshambo>>() {}.getType()));
}
public void testEnumSubclassAsParameterizedType() {
Collection<Roshambo> list = new ArrayList<Roshambo>();
list.add(Roshambo.ROCK);
list.add(Roshambo.PAPER);
String json = gson.toJson(list);
assertEquals("[\"ROCK\",\"PAPER\"]", json);
Type collectionType = new TypeToken<Collection<Roshambo>>() {}.getType();
Collection<Roshambo> actualJsonList = gson.fromJson(json, collectionType);
MoreAsserts.assertContains(actualJsonList, Roshambo.ROCK);
MoreAsserts.assertContains(actualJsonList, Roshambo.PAPER);
}
public void testEnumCaseMapping() {
assertEquals(Gender.MALE, gson.fromJson("\"boy\"", Gender.class));
assertEquals("\"boy\"", gson.toJson(Gender.MALE, Gender.class));
}
public void testEnumSet() {
EnumSet<Roshambo> foo = EnumSet.of(Roshambo.ROCK, Roshambo.PAPER);
String json = gson.toJson(foo);
Type type = new TypeToken<EnumSet<Roshambo>>() {}.getType();
EnumSet<Roshambo> bar = gson.fromJson(json, type);
assertTrue(bar.contains(Roshambo.ROCK));
assertTrue(bar.contains(Roshambo.PAPER));
assertFalse(bar.contains(Roshambo.SCISSORS));
}
public enum Roshambo {
ROCK {
@Override Roshambo defeats() {
return SCISSORS;
}
},
PAPER {
@Override Roshambo defeats() {
return ROCK;
}
},
SCISSORS {
@Override Roshambo defeats() {
return PAPER;
}
};
abstract Roshambo defeats();
}
private static class MyEnumTypeAdapter
implements JsonSerializer<Roshambo>, JsonDeserializer<Roshambo> {
public JsonElement serialize(Roshambo src, Type typeOfSrc, JsonSerializationContext context) {
return new JsonPrimitive("123" + src.name());
}
public Roshambo deserialize(JsonElement json, Type classOfT, JsonDeserializationContext context)
throws JsonParseException {
return Roshambo.valueOf(json.getAsString().substring(3));
}
}
public enum Gender {
@SerializedName("boy")
MALE,
@SerializedName("girl")
FEMALE
}
}
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