001    /*
002     * Copyright (C) 2010 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    
020    package org.crsh.vfs.spi.jarurl;
021    
022    import org.crsh.vfs.spi.AbstractFSDriver;
023    
024    import java.io.IOException;
025    import java.io.InputStream;
026    import java.net.JarURLConnection;
027    import java.net.URL;
028    import java.util.Collections;
029    import java.util.HashMap;
030    import java.util.Map;
031    import java.util.jar.JarEntry;
032    import java.util.jar.JarFile;
033    
034    /**
035     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
036     * @version $Revision$
037     */
038    public class JarURLDriver extends AbstractFSDriver<Handle> {
039    
040      /** . */
041      final ClassLoader loader;
042    
043      /** . */
044      final Handle root;
045    
046      /** . */
047      final URL jarURL;
048    
049      private static Handle get(JarURLDriver driver, Map<String, Handle> handles, String path) {
050        Handle handle = handles.get(path);
051        if (handle == null) {
052          handle = new Handle(driver, path);
053          int to = path.length();
054          if (path.charAt(to - 1) == '/') {
055            to--;
056          }
057          int from = -1;
058          for (int i = to - 1;i >= 0;i--) {
059            if (path.charAt(i) == '/') {
060              from = i;
061              break;
062            }
063          }
064          String name;
065          Handle parent;
066          if (from == -1) {
067            parent = handles.get("");
068            name = path.substring(0, to);
069          } else {
070            parent = get(driver, handles, path.substring(0, from));
071            name = path.substring(from + 1, to);
072          }
073          parent.children.put(name, handle);
074          handles.put(path.substring(0, to), handle);
075        }
076        return handle;
077      }
078    
079      public JarURLDriver(ClassLoader loader, JarURLConnection conn) throws IOException {
080        JarFile file = conn.getJarFile();
081        Map<String, Handle> handles = new HashMap<String, Handle>();
082        handles.put("", root = new Handle(this, ""));
083        for (JarEntry entry : Collections.list(file.entries())) {
084          Handle handle = get(this, handles, entry.getName());
085          handle.entry = entry;
086        }
087    
088        //
089        this.jarURL = conn.getJarFileURL();
090        this.loader = loader;
091      }
092    
093      public Handle root() throws IOException {
094        return root;
095      }
096    
097      public String name(Handle handle) throws IOException {
098        return handle.path.getName();
099      }
100    
101      public boolean isDir(Handle handle) throws IOException {
102        return handle.path.isDir();
103      }
104    
105      public Iterable<Handle> children(Handle handle) throws IOException {
106        return handle.children.values();
107      }
108    
109      public long getLastModified(Handle handle) throws IOException {
110        return 0;
111      }
112    
113      public InputStream open(Handle handle) throws IOException {
114        return loader.getResourceAsStream(handle.entry.getName());
115      }
116    }