statesystem/org.eclipse.tracecompass.segmentstore.core/src/org/eclipse/tracecompass/segmentstore/core/BasicSegment.java

   1 /*******************************************************************************
   2  * Copyright (c) 2015 EfficiOS Inc., Alexandre Montplaisir
   3  *
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *******************************************************************************/
   9
  10 package org.eclipse.tracecompass.segmentstore.core;
  11
  12 import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull;
  13
  14 import java.util.Comparator;
  15
  16 import org.eclipse.jdt.annotation.Nullable;
  17
  18 import com.google.common.collect.Ordering;
  19
  20 /**
  21  * Basic implementation of {@link ISegment}.
  22  *
  23  * @author Alexandre Montplaisir
  24  */
  25 public class BasicSegment implements ISegment {
  26
  27     private static final long serialVersionUID = -3257452887960883177L;
  28
  29     private static final Comparator<ISegment> COMPARATOR;
  30     static {
  31         /* checkNotNull() has to be called separately, or else it breaks the
  32          * type inference. */
  33         Comparator<ISegment> comp = Ordering
  34                 .from(SegmentComparators.INTERVAL_START_COMPARATOR)
  35                 .compound(SegmentComparators.INTERVAL_END_COMPARATOR);
  36         COMPARATOR = checkNotNull(comp);
  37     }
  38
  39     private final long fStart;
  40     private final long fEnd;
  41
  42     /**
  43      * Create a new segment.
  44      *
  45      * The end position should be equal to or greater than the start position.
  46      *
  47      * @param start
  48      *            Start position of the segment
  49      * @param end
  50      *            End position of the segment
  51      */
  52     public BasicSegment(long start, long end) {
  53         if (end < start) {
  54             throw new IllegalArgumentException();
  55         }
  56         fStart = start;
  57         fEnd = end;
  58     }
  59
  60     @Override
  61     public long getStart() {
  62         return fStart;
  63     }
  64
  65     @Override
  66     public long getEnd() {
  67         return fEnd;
  68     }
  69
  70     @Override
  71     public int compareTo(@Nullable ISegment o) {
  72         if (o == null) {
  73             throw new IllegalArgumentException();
  74         }
  75         return COMPARATOR.compare(this, o);
  76     }
  77
  78     @Override
  79     public String toString() {
  80         return new String('[' + String.valueOf(fStart) + ", " + String.valueOf(fEnd) + ']'); //$NON-NLS-1$
  81     }
  82 }