/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2002 The Apache Software Foundation. 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
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*
* 2. Redistributions in binary form must reproduce the above copyright
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* the documentation and/or other materials provided with the
* distribution.
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* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
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* 5. Products derived from this software may not be called "Apache"
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* 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 Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
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*
*/
package org.apache.commons.discovery.resource.classes;
import java.net.URL;
import java.util.Vector;
import org.apache.commons.discovery.Resource;
import org.apache.commons.discovery.ResourceClass;
import org.apache.commons.discovery.ResourceClassDiscover;
import org.apache.commons.discovery.ResourceClassIterator;
import org.apache.commons.discovery.ResourceIterator;
import org.apache.commons.discovery.ResourceNameIterator;
import org.apache.commons.discovery.log.DiscoveryLogFactory;
import org.apache.commons.discovery.resource.ClassLoaders;
import org.apache.commons.logging.Log;
/**
* The findResources() method will check every loader.
*
* @author Richard A. Sitze
* @author Craig R. McClanahan
* @author Costin Manolache
* @author James Strachan
*/
public class DiscoverClasses
extends ResourceClassDiscoverImpl
implements ResourceClassDiscover
{
private static Log log = DiscoveryLogFactory.newLog(DiscoverClasses.class);
public static void setLog(Log _log) {
log = _log;
}
/** Construct a new resource discoverer
*/
public DiscoverClasses() {
super();
}
/** Construct a new resource discoverer
*/
public DiscoverClasses(ClassLoaders classLoaders) {
super(classLoaders);
}
public ResourceClassIterator findResourceClasses(final String className) {
final String resourceName = className.replace('.','/') + ".class";
if (log.isDebugEnabled())
log.debug("find: className='" + className + "'");
return new ResourceClassIterator() {
private Vector history = new Vector();
private int idx = 0;
private ResourceClass resource = null;
public boolean hasNext() {
if (resource == null) {
resource = getNextClass();
}
return resource != null;
}
public ResourceClass nextResourceClass() {
ResourceClass element = resource;
resource = null;
return element;
}
private ResourceClass getNextClass() {
while (idx < getClassLoaders().size()) {
ClassLoader loader = getClassLoaders().get(idx++);
URL url = loader.getResource(resourceName);
if (url != null) {
if (!history.contains(url)) {
history.addElement(url);
if (log.isDebugEnabled())
log.debug("getNextClass: next URL='" + url + "'");
return new ResourceClass(className, url, loader);
}
if (log.isDebugEnabled())
log.debug("getNextClass: duplicate URL='" + url + "'");
} else {
if (log.isDebugEnabled())
log.debug("getNextClass: loader " + loader + ": '" + resourceName + "' not found");
}
}
return null;
}
};
}
}