001/*
002 * (C) Copyright 2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 *
019 * $Id: DeepCopy.java 19474 2007-05-27 10:18:21Z sfermigier $
020 */
021
022package org.nuxeo.ecm.platform.ui.web.util;
023
024import java.io.ByteArrayInputStream;
025import java.io.ByteArrayOutputStream;
026import java.io.IOException;
027import java.io.ObjectInputStream;
028import java.io.ObjectOutputStream;
029
030/**
031 * Deep copy utils.
032 * <p>
033 * Most classes implementing the {@link Cloneable} interface only perform a shallow copy of an object. This class
034 * performs deep cloning serializing and deserializing an object. Therefore only serializable objects can be copied
035 * using this util.
036 *
037 * @author <a href="mailto:at@nuxeo.com">Anahide Tchertchian</a>
038 */
039// XXX AT: needs optimizing, see
040// http://javatechniques.com/blog/faster-deep-copies-of-java-objects/
041public final class DeepCopy {
042
043    // Utility class.
044    private DeepCopy() {
045    }
046
047    public static Object deepCopy(Object object) {
048        Object copy;
049        try {
050            // Write the object out to a byte array
051            ByteArrayOutputStream bos = new ByteArrayOutputStream();
052            ObjectOutputStream out = new ObjectOutputStream(bos);
053            out.writeObject(object);
054            out.flush();
055            out.close();
056
057            // Make an input stream from the byte array and read
058            // a copy of the object back in.
059            ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
060            copy = in.readObject();
061        } catch (IOException e) {
062            throw new RuntimeException(e);
063        } catch (ClassNotFoundException cnfe) {
064            throw new RuntimeException(cnfe);
065        }
066        return copy;
067    }
068
069}