org.eclipse.linuxtools.tmf.core/src/org/eclipse/linuxtools/tmf/core/synchronization/TmfTimestampTransform.java

   1 /*******************************************************************************
   2  * Copyright (c) 2013 École Polytechnique de Montréal
   3  *
   4  * All rights reserved. This program and the accompanying materials are made
   5  * available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Geneviève Bastien - Initial implementation and API
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.tmf.core.synchronization;
  14
  15 import java.io.Serializable;
  16
  17 import org.eclipse.linuxtools.tmf.core.timestamp.ITmfTimestamp;
  18
  19 /**
  20  * A default simple, identity timestamp transform. It is a singleton class and
  21  * returns the timestamp itself
  22  *
  23  * @author Geneviève Bastien
  24  * @since 3.0
  25  */
  26 public class TmfTimestampTransform implements ITmfTimestampTransform, Serializable {
  27
  28     /**
  29      * Generated serial UID
  30      */
  31     private static final long serialVersionUID = -1480581417493073304L;
  32
  33     /**
  34      * The unique instance of this transform, since it is always the same
  35      */
  36     public static final TmfTimestampTransform IDENTITY = new TmfTimestampTransform();
  37
  38     /**
  39      * Default constructor
  40      */
  41     protected TmfTimestampTransform() {
  42
  43     }
  44
  45     @Override
  46     public ITmfTimestamp transform(ITmfTimestamp timestamp) {
  47         return timestamp;
  48     }
  49
  50     @Override
  51     public long transform(long timestamp) {
  52         return timestamp;
  53     }
  54
  55     @Override
  56     public ITmfTimestampTransform composeWith(ITmfTimestampTransform composeWith) {
  57         /* Since this transform will not modify anything, return the other */
  58         return composeWith;
  59     }
  60
  61     @Override
  62     public boolean equals(Object other) {
  63         return other.getClass().equals(TmfTimestampTransform.class);
  64     }
  65
  66     @Override
  67     public int hashCode() {
  68         final int prime = 31;
  69         int result = 1;
  70         result = (prime * result) + TmfTimestampTransform.class.hashCode();
  71         return result;
  72     }
  73
  74     @Override
  75     public String toString() {
  76         return "TmfTimestampTransform [ IDENTITY ]"; //$NON-NLS-1$
  77     }
  78
  79 }