org.jboss.marshalling.ChainingObjectTable 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.List;
import java.util.ArrayList;
import java.io.IOException;
import java.io.StreamCorruptedException;

/**
 * An object table that multiplexes up to 256 class tables.  The protocol works by prepending the custom object table
 * with an identifier byte.
 */
public class ChainingObjectTable implements ObjectTable {
    private static Pair pair(final ObjectTable objectTable, final Writer writer) {
        return Pair.create(objectTable, writer);
    }

    private final List> writers;
    private final ObjectTable[] readers;

    /**
     * Construct a new instance.  The given array may be sparse, but it may not be more than
     * 256 elements in length.  Object tables are checked in order of increasing array index.
     *
     * @param objectTables the object tables to delegate to
     */
    public ChainingObjectTable(final ObjectTable[] objectTables) {
        if (objectTables == null) {
            throw new NullPointerException("objectTables is null");
        }
        readers = objectTables.clone();
        if (readers.length > 256) {
            throw new IllegalArgumentException("Object table array is too long (limit is 256 elements)");
        }
        writers = new ArrayList>();
        for (int i = 0; i < readers.length; i++) {
            final ObjectTable objectTable = readers[i];
            if (objectTable != null) {
                final int idx = i;
                writers.add(pair(objectTable, new Writer() {
                    public void writeObject(final Marshaller marshaller, final Object obj) throws IOException {
                        marshaller.writeByte(idx);
                        objectTable.getObjectWriter(obj).writeObject(marshaller, obj);
                    }
                }));
            }
        }
    }

    /** {@inheritDoc} */
    public Writer getObjectWriter(final Object obj) throws IOException {
        for (Pair entry : writers) {
            final ObjectTable table = entry.getA();
            final Writer writer = entry.getB();
            if (table.getObjectWriter(obj) != null) {
                return writer;
            }
        }
        return null;
    }

    /** {@inheritDoc} */
    public Object readObject(final Unmarshaller unmarshaller) throws IOException, ClassNotFoundException {
        final int v = unmarshaller.readByte() & 0xff;
        final ObjectTable table = readers[v];
        if (table == null) {
            throw new StreamCorruptedException(String.format("Unknown object table ID %02x encountered", Integer.valueOf(v)));
        }
        return table.readObject(unmarshaller);
    }
}