org.jboss.marshalling.ChainingObjectResolver 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.Iterator;
import java.util.Collection;

/**
 * An object resolver which runs a sequence of object resolvers.  On write, the resolvers are run in order from first
 * to last.  On read, the resolvers are run in reverse order, from last to first.
 */
public class ChainingObjectResolver implements ObjectResolver {
    private final ObjectResolver[] resolvers;

    /**
     * Construct a new instance.
     *
     * @param resolvers the resolvers to use
     */
    public ChainingObjectResolver(final ObjectResolver[] resolvers) {
        if (resolvers == null) {
            throw new NullPointerException("resolvers is null");
        }
        this.resolvers = resolvers.clone();
    }

    /**
     * Construct a new instance.
     *
     * @param resolvers the resolvers to use
     */
    public ChainingObjectResolver(final Iterator resolvers) {
        if (resolvers == null) {
            throw new NullPointerException("resolvers is null");
        }
        this.resolvers = unroll(resolvers, 0);
    }

    /**
     * Construct a new instance.
     *
     * @param resolvers the resolvers to use
     */
    public ChainingObjectResolver(final Iterable resolvers) {
        this(resolvers.iterator());
    }

    /**
     * Construct a new instance.
     *
     * @param resolvers the resolvers to use
     */
    public ChainingObjectResolver(final Collection resolvers) {
        if (resolvers == null) {
            throw new NullPointerException("resolvers is null");
        }
        this.resolvers = resolvers.toArray(new ObjectResolver[resolvers.size()]);
    }

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

    /** {@inheritDoc} */
    public Object readResolve(final Object replacement) {
        Object o = replacement;
        for (int i = resolvers.length - 1; i >= 0; i--) {
            ObjectResolver resolver = resolvers[i];
            o = resolver.readResolve(o);
        }
        return o;
    }

    /** {@inheritDoc} */
    public Object writeReplace(final Object original) {
        Object o = original;
        for (ObjectResolver resolver : resolvers) {
            o = resolver.writeReplace(o);
        }
        return o;
    }
}