org.eclipse.linuxtools.ctf.core/src/org/eclipse/linuxtools/internal/ctf/core/trace/StreamInputReaderTimestampComparator.java

   1 /*******************************************************************************
   2  * Copyright (c) 2011, 2013 Ericsson, Ecole Polytechnique de Montreal and others
   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: Matthew Khouzam - Initial API and implementation
  10  * Contributors: Simon Marchi - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.internal.ctf.core.trace;
  14
  15 import java.io.Serializable;
  16 import java.util.Comparator;
  17
  18 import org.eclipse.linuxtools.ctf.core.event.EventDefinition;
  19 import org.eclipse.linuxtools.ctf.core.trace.CTFStreamInputReader;
  20 import org.eclipse.linuxtools.ctf.core.trace.Utils;
  21
  22 /**
  23  * <b><u>StreamInputReaderTimestampComparator</u></b>
  24  * <p>
  25  * Compares two StreamInputReader by their timestamp (smaller comes before).
  26  */
  27 public class StreamInputReaderTimestampComparator implements
  28         Comparator<CTFStreamInputReader>, Serializable {
  29
  30     // ------------------------------------------------------------------------
  31     // Constants
  32     // ------------------------------------------------------------------------
  33
  34     private static final long serialVersionUID = 1066434959451875045L;
  35
  36     // ------------------------------------------------------------------------
  37     // Operations
  38     // ------------------------------------------------------------------------
  39
  40     /**
  41      * @throws NullPointerException
  42      *             If any {@link CTFStreamInputReader} parameter is null, of if any
  43      *             of them does not contain a current event.
  44      */
  45     @Override
  46     public int compare(CTFStreamInputReader a, CTFStreamInputReader b) {
  47         EventDefinition event_a = a.getCurrentEvent();
  48         EventDefinition event_b = b.getCurrentEvent();
  49
  50         long ta = event_a.getTimestamp();
  51         long tb = event_b.getTimestamp();
  52         return Utils.unsignedCompare(ta, tb);
  53     }
  54
  55 }