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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 libcore.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertTrue;
import static junit.framework.Assert.fail;
import junit.framework.AssertionFailedError;
public class SerializationTester<T> {
private final String golden;
private final T value;
public SerializationTester(T value, String golden) {
this.golden = golden;
this.value = value;
}
/**
* Returns true if {@code a} and {@code b} are equal. Override this if
* {@link Object#equals} isn't appropriate or sufficient for this tester's
* value type.
*/
protected boolean equals(T a, T b) {
return a.equals(b);
}
/**
* Verifies that {@code deserialized} is valid. Implementations of this
* method may mutate {@code deserialized}.
*/
protected void verify(T deserialized) throws Exception {}
public void test() {
try {
if (golden == null || golden.length() == 0) {
fail("No golden value supplied! Consider using this: "
+ hexEncode(serialize(value)));
}
@SuppressWarnings("unchecked") // deserialize should return the proper type
T deserialized = (T) deserialize(hexDecode(golden));
assertTrue("User-constructed value doesn't equal deserialized golden value",
equals(value, deserialized));
@SuppressWarnings("unchecked") // deserialize should return the proper type
T reserialized = (T) deserialize(serialize(value));
assertTrue("User-constructed value doesn't equal itself, reserialized",
equals(value, reserialized));
// just a sanity check! if this fails, verify() is probably broken
verify(value);
verify(deserialized);
verify(reserialized);
} catch (Exception e) {
Error failure = new AssertionFailedError();
failure.initCause(e);
throw failure;
}
}
private static byte[] serialize(Object object) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
new ObjectOutputStream(out).writeObject(object);
return out.toByteArray();
}
private static Object deserialize(byte[] bytes) throws IOException, ClassNotFoundException {
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
Object result = in.readObject();
assertEquals(-1, in.read());
return result;
}
private static String hexEncode(byte[] bytes) {
StringBuilder result = new StringBuilder(bytes.length * 2);
for (byte b : bytes) {
result.append(String.format("%02x", b));
}
return result.toString();
}
private static byte[] hexDecode(String s) {
byte[] result = new byte[s.length() / 2];
for (int i = 0; i < result.length; i++) {
result[i] = (byte) Integer.parseInt(s.substring(i*2, i*2 + 2), 16);
}
return result;
}
/**
* Returns a serialized-and-deserialized copy of {@code object}.
*/
public static Object reserialize(Object object) throws IOException, ClassNotFoundException {
return deserialize(serialize(object));
}
public static String serializeHex(Object object) throws IOException {
return hexEncode(serialize(object));
}
public static Object deserializeHex(String hex) throws IOException, ClassNotFoundException {
return deserialize(hexDecode(hex));
}
}
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