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The Object Composition library merges multiple Java objects into a single multi-subject object.

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/*
 * Copyright (c) 2009, Zepheira, LLC.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution. 
 * - Neither the name of the openrdf.org nor the names of its contributors may
 *   be used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 */
package org.openrdf.repository.object.managers.converters;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.openrdf.model.Literal;
import org.openrdf.model.URI;
import org.openrdf.model.ValueFactory;
import org.openrdf.model.vocabulary.XMLSchema;
import org.openrdf.repository.object.exceptions.ObjectConversionException;
import org.openrdf.repository.object.managers.Marshall;

/**
 * Converts byte[] to and from Literal.
 * 
 * @author James Leigh
 *
 */
public class ByteArrayMarshall implements Marshall {
	private ValueFactory vf;
	private URI datatype = XMLSchema.BASE64BINARY;

	public ByteArrayMarshall(ValueFactory vf) {
		this.vf = vf;
	}

	public String getJavaClassName() {
		return byte[].class.getName();
	}

	public URI getDatatype() {
		return datatype;
	}

	public void setDatatype(URI datatype) {
		this.datatype = datatype;
	}

	public byte[] deserialize(Literal literal) {
		if (XMLSchema.HEXBINARY.equals(literal.getDatatype())) {
			try {
				return Hex.decodeHex(literal.stringValue().toCharArray());
			} catch (DecoderException e) {
				throw new ObjectConversionException(e);
			}
		}
		return Base64.decodeBase64(literal.stringValue().getBytes());
	}

	public Literal serialize(byte[] data) {
		return vf.createLiteral(new String(Base64.encodeBase64(data)), datatype);
	}

}