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/* GraphGeneratorInstanceManager.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.generators.graphs;
import java.util.HashMap;
import java.util.Map;
import org.grinvin.factories.FactoryException;
import org.grinvin.factories.FactoryManager;
import org.grinvin.params.ParameterList;
/**
* Manages the mapping between Graph generator instances and their identifiers.
*/
public class GraphGeneratorInstanceManager {
// TODO: factor out code in common with other managers of this kind
//
private static final GraphGeneratorInstanceManager SINGLETON = new GraphGeneratorInstanceManager();
/**
* Maps a Graph uri to the corresponding object of type GraphGeneratorInstance.
*/
private final Map<String, GraphGeneratorInstance> instances;
//
private GraphGeneratorInstanceManager() {
instances = new HashMap<String, GraphGeneratorInstance>();
}
/**
* Get the singleton instance of this class
* @return the single shared instance of this class
*/
public static GraphGeneratorInstanceManager getInstance() {
return SINGLETON;
}
//
private void registerGraphGeneratorInstance(GraphGeneratorInstance element) {
instances.put(element.getId(), element);
}
/**
* Get the {@link GraphGeneratorInstance} with the given id. If necessary,
* the instance is created anew.
*/
public GraphGeneratorInstance getGraphGeneratorInstance(String id) throws UnknownGraphGeneratorInstanceException {
GraphGeneratorInstance element = instances.get(id);
if (element == null) {
int pos = id.indexOf('?');
try {
if (pos >= 0)
element = createGraphGeneratorInstance(id.substring(0,pos), id.substring(pos+1));
else
element = createGraphGeneratorInstance(id, "");
} catch (FactoryException ex) {
throw new UnknownGraphGeneratorInstanceException("Invalid graph generator instance", id, ex);
}
registerGraphGeneratorInstance(element);
}
return element;
}
/**
* Create and register an instance from the given generator with its current parameters.
* @return the generator instance, unless a generator instance with the same id was
* already available in cache
*/
public GraphGeneratorInstance createInstance (GraphGenerator generator) throws FactoryException{
// TODO: use the same principle for GraphListElementManager?
String id = generator.getInstanceId();
GraphGeneratorInstance element = instances.get(id);
if (element == null) {
element = generator.createInstance();
registerGraphGeneratorInstance(element);
}
return element;
}
//
private GraphGeneratorInstance createGraphGeneratorInstance(String parentId, String queryString)
throws FactoryException{
GraphGenerator generator = FactoryManager.getGeneratorBroker().get(parentId);
if (generator == null)
throw new FactoryException("Could not create generator " + parentId);
ParameterList list = generator.getParameters();
generator.setParameterValues(list.parseQueryString(queryString));
return generator.createInstance();
}
}
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