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; 021 022 import org.crsh.vfs.spi.FSDriver; 023 024 import java.io.IOException; 025 026 /** 027 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 028 * @version $Revision$ 029 */ 030 class Mount<H> { 031 032 static <H> Mount<H> wrap(FSDriver<H> driver) { 033 return new Mount<H>(driver); 034 } 035 036 /** . */ 037 private final FSDriver<H> driver; 038 039 /** 040 * Create a new mount 041 * 042 * @param driver the driver 043 * @throws NullPointerException if the driver is null 044 */ 045 Mount(FSDriver<H> driver) throws NullPointerException { 046 if (driver == null) { 047 throw new NullPointerException("No null driver accepted"); 048 } 049 this.driver = driver; 050 } 051 052 Handle<H> getHandle(Path path) throws IOException { 053 H current = driver.root(); 054 for (String name : path) { 055 H next = null; 056 for (H child : driver.children(current)) { 057 String childName = driver.name(child); 058 if (childName.equals(name)) { 059 next = child; 060 break; 061 } 062 } 063 if (next == null) { 064 return null; 065 } else { 066 current = next; 067 } 068 } 069 if (path.isDir() == driver.isDir(current)) { 070 return new Handle<H>(driver, current); 071 } else { 072 return null; 073 } 074 } 075 }