src/java/org/apache/jcs/auxiliary/disk/indexed/IndexedDiskElementDescriptor.java

package org.apache.jcs.auxiliary.disk.indexed;


/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License")
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


import java.io.Serializable;

/**
 * Disk objects are located by descriptor entries. These are saved on shutdown
 * and loaded into memory on startup.
 *
 */
public class IndexedDiskElementDescriptor implements Serializable, Comparable
{

    /** Position of the cache data entry on disk. */
    long pos;
    /** Number of bytes the serialized form of the cache data takes. */
    public int len;


    /** Description of the Method */
    public void init( long pos, byte[] data )
    {
        this.pos = pos;
        this.len = data.length;
        //    this.hash = hashCode(data);
    }


    /** Constructor for the DiskElementDescriptor object */
    public IndexedDiskElementDescriptor() { }


    public String toString() {
      StringBuffer buf = new StringBuffer();
      buf.append( "DED: " );
      buf.append( " pos = " + pos );
      buf.append( " len = " + len );
      return buf.toString();
    }

  /**
   * compareTo
   *
   * @param o Object
   * @return int
   */
  public int compareTo(Object o)
  {
    if ( o == null ) {
      return 1;
    }

    int oLen = ((IndexedDiskElementDescriptor)o).len;
    if ( oLen == len ) {
      return 0;
    } else
    if ( oLen > len ) {
      return -1;
    } else
    if ( oLen < len ) {
      return 1;
    }
    return 0;
  }

}