MemoryPseudoFile.java

/*
 * Copyright (C) 2006-2008 Alfresco Software Limited.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */

package org.alfresco.jlan.server.filesys.pseudo;

import org.alfresco.jlan.server.filesys.FileInfo;
import org.alfresco.jlan.server.filesys.NetworkFile;

/**
 * In Memory Pseudo File Class
 * 
 * <p>Pseudo file class that uses an in memory buffer for the file data.
 * 
 * @author gkspencer
 */
public class MemoryPseudoFile extends PseudoFile {
  
  // File data buffer

  private byte[] m_data;

  /**
   * Class constructor
   * 
   * @param name String
   * @param data byte[]
   */
  public MemoryPseudoFile(String name, byte[] data) {
    super(name);

    m_data = data;
  }

  /**
   * Return the file information for the pseudo file
   * 
   * @return FileInfo
   */
  public FileInfo getFileInfo() {

    // Check if the file information is valid

    if (getInfo() == null) {

      // Create the file information

      FileInfo fInfo = new FileInfo(getFileName(), m_data != null ? m_data.length : 0, getAttributes());

      // Set the file creation/modification times

      fInfo.setCreationDateTime(_creationDateTime);
      fInfo.setModifyDateTime(_creationDateTime);
      fInfo.setChangeDateTime(_creationDateTime);

      // Set the allocation size, round up the actual length

      fInfo.setAllocationSize((fInfo.getSize() + 512L) & 0xFFFFFFFFFFFFFE00L);

      setFileInfo(fInfo);
    }

    // Return the file information

    return getInfo();
  }

  /**
   * Return a network file for reading/writing the pseudo file
   * 
   * @param netPath String
   * @return NetworkFile
   */
  public NetworkFile getFile(String netPath) {

    // Create a pseudo file mapped to the in memory file data

    FileInfo finfo = getFileInfo();
    finfo.setPath(netPath);

    return new MemoryNetworkFile(getFileName(), m_data, finfo);
  }
}