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.spi.file;
021
022import org.crsh.util.Utils;
023import org.crsh.vfs.spi.AbstractFSDriver;
024
025import java.io.File;
026import java.io.FileInputStream;
027import java.io.IOException;
028import java.io.InputStream;
029import java.util.Arrays;
030import java.util.Collections;
031import java.util.Iterator;
032
033public class FileDriver extends AbstractFSDriver<File> {
034
035  /** . */
036  private final File root;
037
038  /**
039   * Create a new file driver.
040   *
041   * @param root the root
042   * @throws NullPointerException if the root argument is null
043   */
044  public FileDriver(File root) throws NullPointerException {
045    if (root == null) {
046      throw new NullPointerException();
047    }
048
049    //
050    this.root = root;
051  }
052
053  public File root() throws IOException {
054    return root;
055  }
056
057  public String name(File handle) throws IOException {
058    return handle.getName();
059  }
060
061  public boolean isDir(File handle) throws IOException {
062    return handle.isDirectory();
063  }
064
065  public Iterable<File> children(File handle) throws IOException {
066    File[] files = handle.listFiles();
067    return files != null ? Arrays.asList(files) : Collections.<File>emptyList();
068  }
069
070  public long getLastModified(File handle) throws IOException {
071    return handle.lastModified();
072  }
073
074  public Iterator<InputStream> open(File handle) throws IOException {
075    return Utils.<InputStream>iterator(new FileInputStream(handle));
076  }
077}