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;
021
022 import org.crsh.util.IO;
023 import org.crsh.util.Utils;
024 import org.crsh.vfs.spi.FSDriver;
025
026 import java.io.IOException;
027 import java.io.InputStream;
028 import java.util.ArrayList;
029 import java.util.Iterator;
030 import java.util.LinkedList;
031 import java.util.List;
032
033 class 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(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(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 }