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