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

   1 /*******************************************************************************
   2  * Copyright (c) 2011-2012 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.trace.StreamInputReader;
  19
  20
  21 /**
  22  * <b><u>StreamInputReaderTimestampComparator</u></b>
  23  * <p>
  24  * Compares two StreamInputReader by their timestamp (smaller comes before).
  25  */
  26 public class StreamInputReaderTimestampComparator implements
  27         Comparator<StreamInputReader>, Serializable {
  28
  29     // ------------------------------------------------------------------------
  30     // Constants
  31     // ------------------------------------------------------------------------
  32
  33     private static final long serialVersionUID = 1066434959451875045L;
  34
  35     // ------------------------------------------------------------------------
  36     // Operations
  37     // ------------------------------------------------------------------------
  38
  39     @Override
  40     public int compare(StreamInputReader a, StreamInputReader b) {
  41         // TODO: use unsigned comparison to avoid sign errors if needed
  42         if (a.getCurrentEvent() == null) {
  43             return 0;
  44         }
  45         if (b.getCurrentEvent() == null) {
  46             return 0;
  47         }
  48         long ta = a.getCurrentEvent().getTimestamp();
  49         long tb = b.getCurrentEvent().getTimestamp();
  50
  51         if (ta < tb) {
  52             return -1;
  53         } else if (ta > tb) {
  54             return 1;
  55         } else {
  56             return 0;
  57         }
  58     }
  59
  60 }