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;
021    
022    import org.crsh.util.IO;
023    import org.crsh.util.Utils;
024    import org.crsh.vfs.spi.FSDriver;
025    
026    import java.io.IOException;
027    import java.io.InputStream;
028    import java.util.ArrayList;
029    import java.util.Iterator;
030    import java.util.LinkedList;
031    import java.util.List;
032    
033    class Handle<H> {
034    
035      /** . */
036      private final FSDriver<H> driver;
037    
038      /** . */
039      final Key key;
040    
041      /** . */
042      final H handle;
043    
044      Handle(FSDriver<H> driver, H handle) throws IOException {
045        String name = driver.name(handle);
046        boolean dir = driver.isDir(handle);
047    
048        //
049        this.driver = driver;
050        this.handle = handle;
051        this.key = new Key(name, dir);
052      }
053    
054      Iterable<Handle<H>> children() throws IOException {
055        List<Handle<H>> children = new ArrayList<Handle<H>>();
056        for (H h : driver.children(handle)) {
057          children.add(new Handle<H>(driver, h));
058        }
059        return children;
060      }
061    
062      Resource getResource() throws IOException {
063        InputStream in = open();
064        byte[] bytes = IO.readAsBytes(in);
065        long lastModified = getLastModified();
066        return new Resource(bytes, lastModified);
067      }
068    
069      Iterator<Resource> getResources() throws IOException {
070        Iterator<InputStream> i = driver.open(handle);
071        if (i.hasNext()) {
072          LinkedList<Resource> resources = new LinkedList<Resource>();
073          while (i.hasNext()) {
074            InputStream in = i.next();
075            byte[] bytes = IO.readAsBytes(in);
076            long lastModified = getLastModified();
077            resources.add(new Resource(bytes, lastModified));
078          }
079          return resources.iterator();
080        } else {
081          return Utils.iterator();
082        }
083      }
084    
085      private InputStream open() throws IOException {
086        Iterator<InputStream> i = driver.open(handle);
087        if (i.hasNext()) {
088          return i.next();
089        } else {
090          throw new IOException("No stream");
091        }
092      }
093    
094      long getLastModified() throws IOException {
095        return driver.getLastModified(handle);
096      }
097    }