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.IO;
023import org.crsh.util.Utils;
024import org.crsh.vfs.spi.FSDriver;
025
026import java.io.IOException;
027import java.io.InputStream;
028import java.util.ArrayList;
029import java.util.Iterator;
030import java.util.LinkedList;
031import java.util.List;
032
033class 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(key.name, 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(key.name, 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}