001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.configuration2.io;
018
019import java.net.URL;
020
021import org.apache.commons.lang3.StringUtils;
022
023/**
024 * <p>
025 * A specialized {@code FileLocationStrategy} implementation which searches for
026 * files on the class path.
027 * </p>
028 * <p>
029 * This strategy implementation ignores the URL and the base path components of
030 * the passed in {@link FileLocator}. It tries to look up the file name on both
031 * the class path and the system class path.
032 * </p>
033 *
034 * @since 2.0
035 */
036public class ClasspathLocationStrategy implements FileLocationStrategy
037{
038    /**
039     * {@inheritDoc} This implementation looks up the locator's file name as a
040     * resource on the class path.
041     */
042    @Override
043    public URL locate(final FileSystem fileSystem, final FileLocator locator)
044    {
045        return StringUtils.isEmpty(locator.getFileName()) ? null
046                : FileLocatorUtils.locateFromClasspath(locator.getFileName());
047    }
048}