org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/views/uml2sd/util/SortSyncMessageComparator.java

   1 /**********************************************************************
   2  * Copyright (c) 2005, 2006 IBM Corporation and others.
   3  * All rights reserved.   This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  * $Id: SortSyncMessageComparator.java,v 1.2 2006/09/20 20:56:27 ewchan Exp $
   8  *
   9  * Contributors:
  10  * IBM - Initial API and implementation
  11  * Bernd Hufmann - Updated for TMF
  12  **********************************************************************/
  13 package org.eclipse.linuxtools.tmf.ui.views.uml2sd.util;
  14
  15 import java.io.Serializable;
  16 import java.util.Comparator;
  17
  18 import org.eclipse.linuxtools.tmf.ui.views.uml2sd.core.GraphNode;
  19 import org.eclipse.linuxtools.tmf.ui.views.uml2sd.core.SyncMessage;
  20
  21 /**
  22  * Synchronous message comparator Compare two syncMessages only taking into account the event occurrence when their
  23  * appear.<br>
  24  *
  25  * The message with the greater event occurrence is considered to be the greater.<br>
  26  *
  27  * @author sveyrier
  28  *
  29  */
  30 public class SortSyncMessageComparator implements Comparator<GraphNode>, Serializable {
  31
  32     /**
  33      * Serial version UID
  34      */
  35     private static final long serialVersionUID = 4781250984753283718L;
  36
  37     /**
  38      * Compares two synchronous syncMessages. Returns 0 (equal) if one of the message is not synchronous
  39      *
  40      * @return 1 if arg0 is greater, 0 if equal, -1 otherwise
  41      */
  42     @Override
  43     public int compare(GraphNode arg0, GraphNode arg1) {
  44         if (arg0 instanceof SyncMessage && arg1 instanceof SyncMessage) {
  45             SyncMessage m1 = (SyncMessage) arg0;
  46             SyncMessage m2 = (SyncMessage) arg1;
  47             if (m1.getEventOccurrence() > m2.getEventOccurrence())
  48                 return 1;
  49             else if (m1.getEventOccurrence() == m2.getEventOccurrence())
  50                 return 0;
  51             else
  52                 return -1;
  53         } else
  54             return 0;
  55     }
  56
  57 }