fragment.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

- Neither  the name  of Rice  University (RICE) nor  the names  of its
contributors may be  used to endorse or promote  products derived from
this software without specific prior written permission.

This software is provided by RICE and the contributors on an "as is"
basis, without any representations or warranties of any kind, express
or implied including, but not limited to, representations or
warranties of non-infringement, merchantability or fitness for a
particular purpose. In no event shall RICE or contributors be liable
for any direct, indirect, incidental, special, exemplary, or
consequential damages (including, but not limited to, procurement of
substitute goods or services; loss of use, data, or profits; or
business interruption) however caused and on any theory of liability,
whether in contract, strict liability, or tort (including negligence
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if advised of the possibility of such damage.

********************************************************************************/
package rice.p2p.glacier;

import java.io.*;

import rice.p2p.commonapi.rawserialization.*;

/**
 * DESCRIBE THE CLASS
 *
 * @version $Id: pretty.settings 2305 2005-03-11 20:22:33Z jeffh $
 * @author jeffh
 */
public class Fragment implements Serializable {

  /**
   * DESCRIBE THE FIELD
   */
  public transient byte payload[];
  private final static long serialVersionUID = -809948154556539350L;

  /**
   * Constructor for Fragment.
   *
   * @param _size DESCRIBE THE PARAMETER
   */
  public Fragment(int _size) {
    payload = new byte[_size];
  }

  /**
   * Constructor for Fragment.
   *
   * @param buf DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public Fragment(InputBuffer buf) throws IOException {
    payload = new byte[buf.readInt()];
    buf.read(payload, 0, payload.length);

  }

  /**
   * Gets the Payload attribute of the Fragment object
   *
   * @return The Payload value
   */
  public byte[] getPayload() {
    return payload;
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param oos DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  private void writeObject(ObjectOutputStream oos) throws IOException {
    oos.defaultWriteObject();
    oos.writeInt(payload.length);
    oos.write(payload);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param ois DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   * @exception ClassNotFoundException DESCRIBE THE EXCEPTION
   */
  private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
    ois.defaultReadObject();
    payload = new byte[ois.readInt()];
    ois.readFully(payload, 0, payload.length);
  }

  /**
   * DESCRIBE THE METHOD
   *
   * @param buf DESCRIBE THE PARAMETER
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public void serialize(OutputBuffer buf) throws IOException {
    buf.writeInt(payload.length);
    buf.write(payload, 0, payload.length);
  }

}