001    /*
002     * Copyright (C) 2012 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.mount;
021    
022    import org.crsh.vfs.Path;
023    import org.crsh.vfs.spi.AbstractFSDriver;
024    import org.crsh.vfs.spi.FSDriver;
025    
026    import java.io.IOException;
027    import java.io.InputStream;
028    
029    public class MountDriver<H> extends AbstractFSDriver<H> {
030    
031      /** . */
032      private final Path path;
033    
034      /** . */
035      private final FSDriver<H> driver;
036    
037      public MountDriver(Path path, FSDriver<H> driver) {
038        if (path == null) {
039          throw new NullPointerException();
040        }
041        if (driver == null) {
042          throw new NullPointerException();
043        }
044        if (!path.isDir()) {
045          throw new IllegalArgumentException("Mount path must be a dir");
046        }
047    
048        //
049        this.path = path;
050        this.driver = driver;
051      }
052    
053      public H root() throws IOException {
054        H root = driver.root();
055        for (String name : path) {
056          root = driver.child(root, name);
057          if (root == null) {
058            break;
059          }
060        }
061        return root;
062      }
063    
064      public String name(H handle) throws IOException {
065        return driver.name(handle);
066      }
067    
068      public boolean isDir(H handle) throws IOException {
069        return driver.isDir(handle);
070      }
071    
072      public Iterable<H> children(H handle) throws IOException {
073        return driver.children(handle);
074      }
075    
076      public long getLastModified(H handle) throws IOException {
077        return driver.getLastModified(handle);
078      }
079    
080      public InputStream open(H handle) throws IOException {
081        return driver.open(handle);
082      }
083    }