/*
* $Header$
* $Revision: 982 $
* $Date: 2006-12-08 18:42:51 +1000 (Fri, 08 Dec 2006) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* the JRDF Project (http://jrdf.sf.net/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
* or promote products derived from this software without prior written
* permission. For written permission, please contact
* newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
* nor may "JRDF" appear in their names without prior written
* permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project. For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/
package org.jrdf;
import org.jrdf.collection.BdbCollectionFactory;
import org.jrdf.collection.IteratorTrackingCollectionFactory;
import org.jrdf.graph.Graph;
import org.jrdf.graph.local.index.nodepool.NodePool;
import org.jrdf.graph.local.index.nodepool.NodePoolFactory;
import org.jrdf.graph.local.index.nodepool.bdb.BdbNodePoolFactory;
import org.jrdf.parser.RdfReader;
import org.jrdf.query.QueryFactory;
import org.jrdf.query.QueryFactoryImpl;
import org.jrdf.query.execute.QueryEngine;
import org.jrdf.sparql.SparqlConnection;
import org.jrdf.sparql.SparqlConnectionImpl;
import org.jrdf.sparql.builder.QueryBuilder;
import org.jrdf.util.DirectoryHandler;
import org.jrdf.util.Models;
import org.jrdf.util.ModelsImpl;
import org.jrdf.util.bdb.BdbEnvironmentHandler;
import static org.jrdf.writer.Writer.writeNTriples;
import java.io.File;
import java.util.HashSet;
import java.util.Set;
public class BasePersistentJRDFFactoryImpl implements BasePersistentJRDFFactory {
private static final QueryFactory QUERY_FACTORY = new QueryFactoryImpl();
private static final QueryEngine QUERY_ENGINE = QUERY_FACTORY.createQueryEngine();
private static final QueryBuilder BUILDER = QUERY_FACTORY.createQueryBuilder();
private final Set<NodePoolFactory> openNodePoolFactories = new HashSet<NodePoolFactory>();
private final BdbEnvironmentHandler bdbHandler;
private IteratorTrackingCollectionFactory collectionFactory;
private Models models;
private File file;
private Graph modelsGraph;
public BasePersistentJRDFFactoryImpl(DirectoryHandler newHandler, BdbEnvironmentHandler newBdbHandler) {
this.bdbHandler = newBdbHandler;
newHandler.makeDir();
file = new File(newHandler.getDir(), "graphs.nt");
}
public SparqlConnection createSparqlConnection() {
return new SparqlConnectionImpl(BUILDER, QUERY_ENGINE);
}
public NodePool createNodePool(long graphNumber) {
NodePoolFactory nodePoolFactory = new BdbNodePoolFactory(bdbHandler, graphNumber);
final NodePool nodePool = nodePoolFactory.openExistingNodePool();
openNodePoolFactories.add(nodePoolFactory);
return nodePool;
}
public IteratorTrackingCollectionFactory createCollectionFactory(long graphNumber) {
collectionFactory = new BdbCollectionFactory(bdbHandler, "collection" + graphNumber);
return collectionFactory;
}
public boolean hasGraph(String name) {
return models.hasGraph(name);
}
public long addNewGraph(String name) {
if (models.getId(name) != 0) {
throw new IllegalArgumentException("Graph " + name + " already exists");
}
long graphNumber = models.addGraph(name);
writeNTriples(file, modelsGraph);
return graphNumber;
}
public long getGraphId(String name) {
return models.getId(name);
}
public void refresh() {
modelsGraph = new RdfReader().parseNTriples(file);
models = new ModelsImpl(modelsGraph);
}
public void close() {
for (NodePoolFactory openFactory : openNodePoolFactories) {
openFactory.close();
}
if (collectionFactory != null) {
collectionFactory.close();
}
openNodePoolFactories.clear();
}
}