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.spi.file;
021
022 import org.crsh.util.Utils;
023 import org.crsh.vfs.spi.AbstractFSDriver;
024
025 import java.io.File;
026 import java.io.FileInputStream;
027 import java.io.IOException;
028 import java.io.InputStream;
029 import java.util.Arrays;
030 import java.util.Collections;
031 import java.util.Iterator;
032
033 public 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 }