org.jboss.marshalling.ChainingClassExternalizerFactory Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 org.jboss.marshalling;

import java.util.Collection;
import java.util.Iterator;

/**
 * A class externalizer factory that tries each delegate externalizer factory in sequence, returning the first match.
 */
public class ChainingClassExternalizerFactory implements ClassExternalizerFactory {
    private final ClassExternalizerFactory[] externalizerFactories;

    /**
     * Construct a new instance.
     *
     * @param factories a collection of factories to use
     */
    public ChainingClassExternalizerFactory(final Collection factories) {
        externalizerFactories = factories.toArray(new ClassExternalizerFactory[factories.size()]);
    }

    /**
     * Construct a new instance.
     *
     * @param factories a collection of factories to use
     */
    public ChainingClassExternalizerFactory(final Iterable factories) {
        this(factories.iterator());
    }

    /**
     * Construct a new instance.
     *
     * @param factories a sequence of factories to use
     */
    public ChainingClassExternalizerFactory(final Iterator factories) {
        externalizerFactories = unroll(factories, 0);
    }

    /**
     * Construct a new instance.
     *
     * @param factories an array of factories to use
     */
    public ChainingClassExternalizerFactory(final ClassExternalizerFactory[] factories) {
        externalizerFactories = factories.clone();
    }

    private static ClassExternalizerFactory[] unroll(final Iterator iterator, final int i) {
        if (iterator.hasNext()) {
            final ClassExternalizerFactory factory = iterator.next();
            final ClassExternalizerFactory[] array = unroll(iterator, i + 1);
            array[i] = factory;
            return array;
        } else {
            return new ClassExternalizerFactory[i];
        }
    }

    /** {@inheritDoc}  This implementation tries each nested externalizer factory in order until a match is found. */
    public Externalizer getExternalizer(final Class type) {
        for (ClassExternalizerFactory externalizerFactory : externalizerFactories) {
            final Externalizer externalizer = externalizerFactory.getExternalizer(type);
            if (externalizer != null) {
                return externalizer;
            }
        }
        return null;
    }
}