ReadUtil.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.naming.remote.protocol.v1;

import java.io.DataInput;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import org.jboss.marshalling.ByteInput;
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.MarshallingConfiguration;
import org.jboss.marshalling.SimpleClassResolver;
import org.jboss.marshalling.Unmarshaller;
import static org.jboss.naming.remote.protocol.v1.Constants.MARSHALLING_STRATEGY;

/**
 * @author John Bailey
 */
public class ReadUtil {
    static final MarshallerFactory marshallerFactory;

    static {
        marshallerFactory = Marshalling.getProvidedMarshallerFactory(MARSHALLING_STRATEGY);
        if (marshallerFactory == null) {
            throw new RuntimeException("Could not find a marshaller factory for " + MARSHALLING_STRATEGY + " marshalling strategy");
        }
    }

    static Unmarshaller prepareForUnMarshalling(final DataInput dataInput, final ClassLoader classloader) throws IOException {
        final Unmarshaller unmarshaller = getUnMarshaller(marshallerFactory, classloader);
        final InputStream is = new InputStream() {
            @Override
            public int read() throws IOException {
                try {

                    final int b = dataInput.readByte();
                    return b & 0xff;
                } catch (EOFException eof) {
                    return -1;
                }
            }
        };
        final ByteInput byteInput = Marshalling.createByteInput(is);
        // start the unmarshaller
        unmarshaller.start(byteInput);

        return unmarshaller;
    }

    static Unmarshaller getUnMarshaller(final MarshallerFactory marshallerFactory, final ClassLoader classloader) throws IOException {
        final MarshallingConfiguration marshallingConfiguration = new MarshallingConfiguration();
        marshallingConfiguration.setVersion(2);
    	marshallingConfiguration.setClassResolver(new SimpleClassResolver(classloader));
        return marshallerFactory.createUnmarshaller(marshallingConfiguration);
    }

}