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.xbean.classloader;
018
019import java.io.File;
020import java.io.FileInputStream;
021import java.io.IOException;
022import java.net.MalformedURLException;
023import java.util.jar.Manifest;
024
025/**
026 * @version $Rev: 776705 $ $Date: 2009-05-20 16:09:47 +0200 (mer. 20 mai 2009) $
027 */
028public 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.toURI().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}