/*
* $Header$
* $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.query.server;
import org.jrdf.graph.Graph;
import org.jrdf.graph.GraphException;
import org.jrdf.graph.ObjectNode;
import org.jrdf.graph.Resource;
import org.jrdf.graph.Value;
import org.jrdf.parser.RdfReader;
import org.jrdf.util.ClosableIterator;
import org.jrdf.util.DirectoryHandler;
import org.jrdf.util.Models;
import org.jrdf.util.ModelsImpl;
import static org.jrdf.util.ModelsImpl.JRDF_NAMESPACE;
import static org.restlet.data.Status.SERVER_ERROR_INTERNAL;
import org.restlet.resource.ResourceException;
import java.io.File;
import java.net.URI;
import static java.net.URI.create;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* @author Andrew Newman
* @version :$
*/
public class GraphListerImpl implements GraphLister {
private static final URI NAME = create(JRDF_NAMESPACE + "name");
private static final URI ID = create(JRDF_NAMESPACE + "id");
private final DirectoryHandler handler;
private final GraphApplication application;
private Set<Resource> resources;
private String graphsFile;
public GraphListerImpl(DirectoryHandler newHandler, GraphApplication newApplication, String newGraphsFile) {
this.graphsFile = newGraphsFile;
this.handler = newHandler;
this.application = newApplication;
}
public Map<String, String> populateIdNameMap() throws ResourceException {
refreshGraphsModel();
Map<String, String> idNameMap = new HashMap<String, String>();
try {
for (Resource resource : resources) {
String id = getStringValue(resource, ID);
String name = getStringValue(resource, NAME);
idNameMap.put(id, name);
}
} catch (Exception e) {
throw new ResourceException(SERVER_ERROR_INTERNAL, e);
}
return idNameMap;
}
public String dirName() {
return application.getGraphsDir();
}
private void refreshGraphsModel() {
final File file = new File(handler.getDir(), graphsFile);
final Graph modelsGraph = new RdfReader().parseNTriples(file);
final Models model = new ModelsImpl(modelsGraph);
this.resources = model.getResources();
}
private String getStringValue(Resource resource, URI pred) throws GraphException {
final ClosableIterator<ObjectNode> iterator = resource.getObjects(pred);
try {
String name = "";
if (iterator.hasNext()) {
name = ((Value) iterator.next()).getValue().toString();
}
return name;
} finally {
iterator.close();
}
}
}