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; 021 022 import java.io.IOException; 023 024 public abstract class AbstractFSDriver<H> implements FSDriver<H> { 025 026 /** 027 * A simple implementation that iterates over the children to return the one specified 028 * by the <code>name</code> argument. Subclasses can override this method to provide 029 * a more efficient implementation. 030 * 031 * @param handle the directory handle 032 * @param name the child name 033 * @return the child or null 034 * @throws IOException any io exception 035 */ 036 @Override 037 public H child(H handle, String name) throws IOException { 038 if (handle == null) { 039 throw new NullPointerException(); 040 } 041 if (name == null) { 042 throw new NullPointerException(); 043 } 044 for (H child : children(handle)) { 045 String childName = name(child); 046 if (childName.equals(name)) { 047 return child; 048 } 049 } 050 return null; 051 } 052 }