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package org.apache.cayenne.remote.hessian.service;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Serializable;

import org.apache.cayenne.map.EntityResolver;
import org.apache.cayenne.remote.hessian.HessianConfig;
import org.apache.cayenne.remote.hessian.HessianConnection;

import com.caucho.hessian.io.HessianInput;
import com.caucho.hessian.io.HessianOutput;

/**
 * Hessian related utilities.
 * 
 * @since 1.2
 * @author Andrus Adamchik
 */
public final class HessianUtil {

    /**
     * A utility method that clones an object using Hessian serialization/deserialization
     * mechanism, which is different from default Java serialization.
     */
    public static Object cloneViaClientServerSerialization(
            Serializable object,
            EntityResolver serverResolver) throws Exception {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        HessianOutput out = new HessianOutput(bytes);
        out.setSerializerFactory(HessianConfig.createFactory(
                HessianConnection.CLIENT_SERIALIZER_FACTORIES,
                null));
        out.writeObject(object);

        byte[] data = bytes.toByteArray();

        HessianInput in = new HessianInput(new ByteArrayInputStream(data));
        in.setSerializerFactory(HessianConfig.createFactory(
                HessianService.SERVER_SERIALIZER_FACTORIES,
                serverResolver));

        return in.readObject();
    }

    public static Object cloneViaServerClientSerialization(
            Serializable object,
            EntityResolver serverResolver) throws Exception {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        HessianOutput out = new HessianOutput(bytes);
        out.setSerializerFactory(HessianConfig.createFactory(
                HessianService.SERVER_SERIALIZER_FACTORIES,
                serverResolver));
        out.writeObject(object);

        byte[] data = bytes.toByteArray();

        HessianInput in = new HessianInput(new ByteArrayInputStream(data));
        in.setSerializerFactory(HessianConfig.createFactory(
                HessianConnection.CLIENT_SERIALIZER_FACTORIES,
                null));
        return in.readObject();
    }

    private HessianUtil() {

    }
}