Update of /cvsroot/nutch/nutch/src/java/net/nutch/ontology
In directory
sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv23027/src/java/net/nutch/ontology
Added Files:
Ontology.java OntologyFactory.java
Log Message:
Add ontology plugin and its application of query refinement.
--- NEW FILE: Ontology.java ---
/* Copyright (c) 2004 michael j pan. All rights reserved. */
/* Use subject to the same conditions as Nutch. */
/* see http://www.nutch.org/LICENSE.txt. */
package net.nutch.ontology;
import java.util.Iterator;
public interface Ontology {
/** The name of the extension point. */
public final static String X_POINT_ID = Ontology.class.getName();
public void load(String[] urls);
// not yet implemented
//public void merge(Ontology o);
public Iterator subclasses(String entitySearchTerm);
public Iterator synonyms(String queryKeyPhrase);
}
--- NEW FILE: OntologyFactory.java ---
/* Copyright (c) 2004 michael j pan. All rights reserved. */
/* Use subject to the same conditions as Nutch. */
/* see http://www.nutch.org/LICENSE.txt. */
package net.nutch.ontology;
import net.nutch.plugin.*;
import net.nutch.util.NutchConf;
import java.util.logging.Logger;
import net.nutch.util.LogFormatter;
/**
* A factory for retrieving [EMAIL PROTECTED] Ontology} extensions.
*
* @author Michael Pan
* @version $Id: OntologyFactory.java,v 1.1 2004/11/30 06:36:00 johnnx Exp $
*/
public class OntologyFactory {
public final static Logger LOG =
LogFormatter.getLogger(OntologyFactory.class.getName());
private final static ExtensionPoint X_POINT =
PluginRepository.getInstance().getExtensionPoint(Ontology.X_POINT_ID);
private OntologyFactory() {}
/**
* @return Returns the online ontology extension specified
* in nutch configuration's key
* <code>extension.ontology.extension-name</code>.
* If the name is empty (no preference),
* the first available ontology extension is returned.
*/
public static Ontology getOntology() throws PluginRuntimeException {
if (X_POINT == null) {
// not even an extension point defined.
return null;
}
String extensionName = NutchConf.get("extension.ontology.extension-name");
if (extensionName != null) {
Extension extension = findExtension(extensionName);
if (extension != null) {
LOG.info("Using ontology extension: " + extensionName);
return (Ontology) extension.getExtensionInstance();
}
LOG.warning("Ontology extension not found: '" + extensionName
+ "', trying the default");
// not found, fallback to the default, if available.
}
Extension[] extensions = X_POINT.getExtentens();
if (extensions.length > 0) {
LOG.info("Using the first ontology extension found: "
+ extensions[0].getId());
return (Ontology) extensions[0].getExtensionInstance();
} else {
return null;
}
}
private static Extension findExtension(String name)
throws PluginRuntimeException {
Extension[] extensions = X_POINT.getExtentens();
for (int i = 0; i < extensions.length; i++) {
Extension extension = extensions[i];
if (name.equals(extension.getId()))
return extension;
}
return null;
}
}
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