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/*
* Copyright (C) 2012 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;
import com.google.gson.reflect.TypeToken;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;
/**
* Check that Gson doesn't return non-serializable data types.
*
* @author Jesse Wilson
*/
public final class JavaSerializationTest extends TestCase {
private final Gson gson = new Gson();
public void testMapIsSerializable() throws Exception {
Type type = new TypeToken<Map<String, Integer>>() {}.getType();
Map<String, Integer> map = gson.fromJson("{\"b\":1,\"c\":2,\"a\":3}", type);
Map<String, Integer> serialized = serializedCopy(map);
assertEquals(map, serialized);
// Also check that the iteration order is retained.
assertEquals(Arrays.asList("b", "c", "a"), new ArrayList<String>(serialized.keySet()));
}
public void testListIsSerializable() throws Exception {
Type type = new TypeToken<List<String>>() {}.getType();
List<String> list = gson.fromJson("[\"a\",\"b\",\"c\"]", type);
List<String> serialized = serializedCopy(list);
assertEquals(list, serialized);
}
public void testNumberIsSerializable() throws Exception {
Type type = new TypeToken<List<Number>>() {}.getType();
List<Number> list = gson.fromJson("[1,3.14,6.673e-11]", type);
List<Number> serialized = serializedCopy(list);
assertEquals(1.0, serialized.get(0).doubleValue());
assertEquals(3.14, serialized.get(1).doubleValue());
assertEquals(6.673e-11, serialized.get(2).doubleValue());
}
@SuppressWarnings("unchecked") // Serialization promises to return the same type.
private <T> T serializedCopy(T object) throws IOException, ClassNotFoundException {
ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(bytesOut);
out.writeObject(object);
out.close();
ByteArrayInputStream bytesIn = new ByteArrayInputStream(bytesOut.toByteArray());
ObjectInputStream in = new ObjectInputStream(bytesIn);
return (T) in.readObject();
}
}
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