MultiStrategyCopier.java

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/*
 * Copyright 2014 OmniFaces.
 *
 * 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.sun.faces.util.copier;

import static java.util.Arrays.asList;
import java.util.List;

/**
 * Copier that copies an object trying a variety of strategies until one
 * succeeds.
 * <p>
 * The strategies that will be attempted in order are:
 * <ol>
 * <li> Serialization
 * <li> Cloning
 * <li> Copy constructor
 * <li> New instance
 * </ol>
 *
 * @since 2.3
 * @author Arjan Tijms
 *
 */
public class MultiStrategyCopier implements Copier {

    private static final List<Copier> COPIERS = asList( // Note: copier instances used here must be thread-safe!
        new SerializationCopier(), new CloneCopier(), new CopyCtorCopier(), new NewInstanceCopier()
    );

    @Override
    public Object copy(Object object) {

        for (Copier copier : COPIERS) {

            try {
                return copier.copy(object);
            } catch (Exception ignore) {
                continue;
            }

        }

        throw new IllegalStateException("Can't copy object of type " + object.getClass() + ". No copier appeared to be capable of copying it.");
    }

}