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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, James Leigh All rights reserved.
 * 
 * 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.compiler;

import org.openrdf.model.Model;
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.impl.LinkedHashModel;

/**
 * Controls synchronisations issues of read and writing to the in-memory model.
 * 
 * @author James Leigh
 * 
 */
public class RDFDataSource {
	private Model model;

	public RDFDataSource(Model model) {
		this.model = model;
	}

	public boolean contains(Value subj, URI pred, Value obj) {
		if (subj == null || subj instanceof Resource)
			return model.contains((Resource) subj, pred, obj);
		return false;
	}

	public Model match(Value subj, URI pred, Value obj) {
		if (subj == null || subj instanceof Resource)
			return new LinkedHashModel(model.filter((Resource) subj, pred, obj));
		return new LinkedHashModel();
	}

	public Model match(Value subj, URI pred, Value obj, URI graph) {
		if (subj == null || subj instanceof Resource)
			return new LinkedHashModel(model.filter((Resource) subj, pred, obj, graph));
		return new LinkedHashModel();
	}

	public void add(Resource subj, URI pred, Value obj) {
		model.add(subj, pred, obj);
	}

	public boolean remove(Value subj, URI pred, Value obj) {
		if (subj == null || subj instanceof Resource)
			return model.remove((Resource) subj, pred, obj);
		return false;
	}

}