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    }