| /* |
| * 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.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; |
| |
| import libcore.util.HexEncoding; |
| |
| 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: " |
| + HexEncoding.encodeToString(serialize(value))); |
| } |
| |
| @SuppressWarnings("unchecked") // deserialize should return the proper type |
| T deserialized = (T) deserialize(HexEncoding.decode(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; |
| } |
| } |
| |
| public 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; |
| } |
| |
| /** |
| * 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 HexEncoding.encodeToString(serialize(object)); |
| } |
| |
| public static Object deserializeHex(String hex) throws IOException, ClassNotFoundException { |
| return deserialize(HexEncoding.decode(hex)); |
| } |
| } |