- /*
- * ====================================================================
- *
- * 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
- * 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
- * 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.
- *
- * 4. The names "The Jakarta Project", "Commons", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * 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 Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- */
-
- package org.apache.commons.discovery.resource.names;
-
- import java.util.Vector;
-
- import org.apache.commons.discovery.ResourceNameDiscover;
- import org.apache.commons.discovery.ResourceNameIterator;
- import org.apache.commons.discovery.log.DiscoveryLogFactory;
- import org.apache.commons.logging.Log;
-
-
- /**
- * Holder for multiple ResourceNameDiscover instances.
- * The result is the union of the results from each
- * (not a chained sequence, where results feed the next in line.
- *
- * @author Richard A. Sitze
- */
- public class NameDiscoverers
- extends ResourceNameDiscoverImpl
- implements ResourceNameDiscover
- {
- private static Log log = DiscoveryLogFactory.newLog(NameDiscoverers.class);
- public static void setLog(Log _log) {
- log = _log;
- }
-
- private Vector discoverers = new Vector();
-
- /**
- * Construct a new resource name discoverer
- */
- public NameDiscoverers() {
- }
-
- /**
- * Specify an additional class loader to be used in searching.
- * The order of loaders determines the order of the result.
- * It is recommended to add the most specific loaders first.
- */
- public void addResourceNameDiscover(ResourceNameDiscover discover) {
- if (discover != null) {
- discoverers.addElement(discover);
- }
- }
-
- protected ResourceNameDiscover getResourceNameDiscover(int idx) {
- return (ResourceNameDiscover)discoverers.get(idx);
- }
-
- protected int size() {
- return discoverers.size();
- }
-
- /**
- * Set of results of all discoverers.
- *
- * @return ResourceIterator
- */
- public ResourceNameIterator findResourceNames(final String resourceName) {
- if (log.isDebugEnabled())
- log.debug("find: resourceName='" + resourceName + "'");
-
- return new ResourceNameIterator() {
- private int idx = 0;
- private ResourceNameIterator iterator = null;
-
- public boolean hasNext() {
- if (iterator == null || !iterator.hasNext()) {
- iterator = getNextIterator();
- if (iterator == null) {
- return false;
- }
- }
- return iterator.hasNext();
- }
-
- public String nextResourceName() {
- return iterator.nextResourceName();
- }
-
- private ResourceNameIterator getNextIterator() {
- while (idx < size()) {
- ResourceNameIterator iter =
- getResourceNameDiscover(idx++).findResourceNames(resourceName);
-
- if (iter.hasNext()) {
- return iter;
- }
- }
- return null;
- }
- };
- }
- }