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

   1 /*******************************************************************************
   2  * Copyright (c) 2011, 2015 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.tracecompass.internal.ctf.core.trace;
  14
  15 import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull;
  16
  17 import java.io.Serializable;
  18 import java.util.Comparator;
  19
  20 import org.eclipse.tracecompass.ctf.core.event.EventDefinition;
  21 import org.eclipse.tracecompass.ctf.core.trace.CTFStreamInputReader;
  22
  23 /**
  24  * <b><u>StreamInputReaderTimestampComparator</u></b>
  25  * <p>
  26  * Compares two StreamInputReader by their timestamp (smaller comes before).
  27  */
  28 public class StreamInputReaderTimestampComparator implements
  29         Comparator<CTFStreamInputReader>, Serializable {
  30
  31     // ------------------------------------------------------------------------
  32     // Constants
  33     // ------------------------------------------------------------------------
  34
  35     private static final long serialVersionUID = 1066434959451875045L;
  36
  37     // ------------------------------------------------------------------------
  38     // Operations
  39     // ------------------------------------------------------------------------
  40
  41     /**
  42      * @throws NullPointerException
  43      *             If any {@link CTFStreamInputReader} parameter is null, of if any
  44      *             of them does not contain a current event.
  45      */
  46     @Override
  47     public int compare(CTFStreamInputReader a, CTFStreamInputReader b) {
  48         EventDefinition eventA = checkNotNull(a.getCurrentEvent());
  49         EventDefinition eventB = checkNotNull(b.getCurrentEvent());
  50
  51         long ta = eventA.getTimestamp();
  52         long tb = eventB.getTimestamp();
  53         return Utils.unsignedCompare(ta, tb);
  54     }
  55
  56 }