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
020package org.crsh.vfs;
021
022import org.crsh.util.Utils;
023import org.crsh.vfs.spi.FSDriver;
024
025import java.io.IOException;
026import java.io.InputStream;
027import java.util.ArrayList;
028import java.util.Iterator;
029import java.util.LinkedList;
030import java.util.List;
031
032class Handle<H> {
033
034  /** . */
035  private final FSDriver<H> driver;
036
037  /** . */
038  final String name;
039
040  /** . */
041  final H handle;
042
043  Handle(FSDriver<H> driver, H handle) throws IOException {
044    String name = driver.name(handle);
045
046    //
047    this.driver = driver;
048    this.handle = handle;
049    this.name = name;
050  }
051
052  Iterable<Handle<H>> children() throws IOException {
053    List<Handle<H>> children = new ArrayList<Handle<H>>();
054    for (H h : driver.children(handle)) {
055      children.add(new Handle<H>(driver, h));
056    }
057    return children;
058  }
059
060  Resource getResource() throws IOException {
061    InputStream in = open();
062    byte[] bytes = Utils.readAsBytes(in);
063    long lastModified = getLastModified();
064    return new Resource(name, bytes, lastModified);
065  }
066
067  Iterator<Resource> getResources() throws IOException {
068    Iterator<InputStream> i = driver.open(handle);
069    if (i.hasNext()) {
070      LinkedList<Resource> resources = new LinkedList<Resource>();
071      while (i.hasNext()) {
072        InputStream in = i.next();
073        byte[] bytes = Utils.readAsBytes(in);
074        long lastModified = getLastModified();
075        resources.add(new Resource(name, bytes, lastModified));
076      }
077      return resources.iterator();
078    } else {
079      return Utils.iterator();
080    }
081  }
082
083  private InputStream open() throws IOException {
084    Iterator<InputStream> i = driver.open(handle);
085    if (i.hasNext()) {
086      return i.next();
087    } else {
088      throw new IOException("No stream");
089    }
090  }
091
092  long getLastModified() throws IOException {
093    return driver.getLastModified(handle);
094  }
095}