001    /**
002     *
003     * Copyright 2005 The Apache Software Foundation
004     *
005     *  Licensed under the Apache License, Version 2.0 (the "License");
006     *  you may not use this file except in compliance with the License.
007     *  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     */
017    package org.apache.geronimo.kernel.classloader;
018    
019    import java.io.File;
020    import java.io.FileInputStream;
021    import java.io.IOException;
022    import java.net.MalformedURLException;
023    import java.util.jar.Manifest;
024    
025    /**
026     * @version $Rev: 410741 $ $Date: 2006-05-31 21:35:48 -0700 (Wed, 31 May 2006) $
027     */
028    public class DirectoryResourceLocation extends AbstractUrlResourceLocation {
029        private final File baseDir;
030        private boolean manifestLoaded = false;
031        private Manifest manifest;
032    
033        public DirectoryResourceLocation(File baseDir) throws MalformedURLException {
034            super(baseDir.toURL());
035            this.baseDir = baseDir;
036        }
037    
038        public ResourceHandle getResourceHandle(String resourceName) {
039            File file = new File(baseDir, resourceName);
040            if (!file.exists()) {
041                return null;
042            }
043    
044            try {
045                ResourceHandle resourceHandle = new DirectoryResourceHandle(resourceName, file, baseDir, getManifestSafe());
046                return resourceHandle;
047            } catch (MalformedURLException e) {
048                return null;
049            }
050        }
051    
052        public Manifest getManifest() throws IOException {
053            if (!manifestLoaded) {
054                File manifestFile = new File(baseDir, "META-INF/MANIFEST.MF");
055    
056                if (manifestFile.isFile() && manifestFile.canRead()) {
057                    FileInputStream in = null;
058                    try {
059                        in = new FileInputStream(manifestFile);
060                        manifest = new Manifest(in);
061                    } finally {
062                        IoUtil.close(in);
063                    }
064                }
065                manifestLoaded = true;
066            }
067            return manifest;
068        }
069    
070        private Manifest getManifestSafe() {
071            Manifest manifest = null;
072            try {
073                manifest = getManifest();
074            } catch (IOException e) {
075                // ignore
076            }
077            return manifest;
078        }
079    }