001 /* 002 * Copyright (C) 2010 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.mount; 021 022 import org.crsh.vfs.Path; 023 import org.crsh.vfs.spi.AbstractFSDriver; 024 import org.crsh.vfs.spi.FSDriver; 025 026 import java.io.IOException; 027 import java.net.URL; 028 029 /** 030 * The mount driver mounts path of a driver. 031 * 032 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 033 * @version $Revision$ 034 */ 035 public class MountDriver<H> extends AbstractFSDriver<H> { 036 037 /** . */ 038 private final Path path; 039 040 /** . */ 041 private final FSDriver<H> driver; 042 043 public MountDriver(Path path, FSDriver<H> driver) { 044 if (path == null) { 045 throw new NullPointerException(); 046 } 047 if (driver == null) { 048 throw new NullPointerException(); 049 } 050 if (!path.isDir()) { 051 throw new IllegalArgumentException("Mount path must be a dir"); 052 } 053 054 // 055 this.path = path; 056 this.driver = driver; 057 } 058 059 public H root() throws IOException { 060 H root = driver.root(); 061 for (String name : path) { 062 root = driver.child(root, name); 063 if (root == null) { 064 break; 065 } 066 } 067 return root; 068 } 069 070 public String name(H handle) throws IOException { 071 return driver.name(handle); 072 } 073 074 public boolean isDir(H handle) throws IOException { 075 return driver.isDir(handle); 076 } 077 078 public Iterable<H> children(H handle) throws IOException { 079 return driver.children(handle); 080 } 081 082 public URL toURL(H handle) throws IOException { 083 return driver.toURL(handle); 084 } 085 }