001/*
002 *  Copyright 2024 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.core.source;
017
018import org.ametys.runtime.plugin.component.AbstractThreadSafeComponentExtensionPoint;
019
020/**
021 * Extension point for optional source fallback
022 */
023public class OptionalSourceFallbackExtensionPoint extends AbstractThreadSafeComponentExtensionPoint<OptionalSourceFallback>
024{
025    /** Avalon role */
026    public static final String ROLE = OptionalSourceFallbackExtensionPoint.class.getName();
027    
028    /**
029     * Fallback to a default value if the uri is not supported
030     * @param uri The uri that is not supported
031     * @return The fallback url if any or null otherwise
032     */
033    public String fallback(String uri)
034    {
035        for (String extensionId : getExtensionsIds())
036        {
037            OptionalSourceFallback extension = getExtension(extensionId);
038            String fallback = extension.fallback(uri);
039            if (fallback != null)
040            {
041                return fallback;
042            }
043        }
044        return null;
045    }
046}