- /**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements. See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. The ASF licenses this file
- * to you 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 org.apache.hadoop.io.serializer;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.ObjectInputStream;
- import java.io.ObjectOutputStream;
- import java.io.OutputStream;
- import java.io.Serializable;
- /**
- * <p>
- * An experimental {@link Serialization} for Java {@link Serializable} classes.
- * </p>
- * @see JavaSerializationComparator
- */
- public class JavaSerialization implements Serialization<Serializable> {
- static class JavaSerializationDeserializer<T extends Serializable>
- implements Deserializer<T> {
- private ObjectInputStream ois;
- public void open(InputStream in) throws IOException {
- ois = new ObjectInputStream(in) {
- @Override protected void readStreamHeader() {
- // no header
- }
- };
- }
- @SuppressWarnings("unchecked")
- public T deserialize(T object) throws IOException {
- try {
- // ignore passed-in object
- return (T) ois.readObject();
- } catch (ClassNotFoundException e) {
- throw new IOException(e.toString());
- }
- }
- public void close() throws IOException {
- ois.close();
- }
- }
- static class JavaSerializationSerializer
- implements Serializer<Serializable> {
- private ObjectOutputStream oos;
- public void open(OutputStream out) throws IOException {
- oos = new ObjectOutputStream(out) {
- @Override protected void writeStreamHeader() {
- // no header
- }
- };
- }
- public void serialize(Serializable object) throws IOException {
- oos.reset(); // clear (class) back-references
- oos.writeObject(object);
- }
- public void close() throws IOException {
- oos.close();
- }
- }
- public boolean accept(Class<?> c) {
- return Serializable.class.isAssignableFrom(c);
- }
- public Deserializer<Serializable> getDeserializer(Class<Serializable> c) {
- return new JavaSerializationDeserializer<Serializable>();
- }
- public Serializer<Serializable> getSerializer(Class<Serializable> c) {
- return new JavaSerializationSerializer();
- }
- }