VersionMismatchException.java

/* Copyright (c) 2003 The Nutch Organization.  All rights reserved.   */
/* Use subject to the conditions in http://www.nutch.org/LICENSE.txt. */

package net.nutch.io;

import java.io.IOException;

/** Thrown by {@link VersionedWritable#readFields(DataInput)} when the
 * version of an object being read does not match the current implementation
 * version as returned by {@link VersionedWritable#getVersion()}. */
public class VersionMismatchException extends IOException {

  private byte expectedVersion;
  private byte foundVersion;

  public VersionMismatchException(byte expectedVersionIn, byte foundVersionIn){
    expectedVersion = expectedVersionIn;
    foundVersion = foundVersionIn;
  }

  /** Returns a string representation of this object. */
  public String toString(){
    return "A record version mismatch occured. Expecting v"
      + expectedVersion + ", found v" + foundVersion; 
  }
}