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 = checkNotNull(Ordering
  30             .from(SegmentComparators.INTERVAL_START_COMPARATOR)
  31             .compound(SegmentComparators.INTERVAL_END_COMPARATOR));
  32
  33     private final long fStart;
  34     private final long fEnd;
  35
  36     /**
  37      * Create a new segment.
  38      *
  39      * The end position should be equal to or greater than the start position.
  40      *
  41      * @param start
  42      *            Start position of the segment
  43      * @param end
  44      *            End position of the segment
  45      */
  46     public BasicSegment(long start, long end) {
  47         if (end < start) {
  48             throw new IllegalArgumentException();
  49         }
  50         fStart = start;
  51         fEnd = end;
  52     }
  53
  54     @Override
  55     public long getStart() {
  56         return fStart;
  57     }
  58
  59     @Override
  60     public long getEnd() {
  61         return fEnd;
  62     }
  63
  64     @Override
  65     public long getLength() {
  66         return (fEnd - fStart);
  67     }
  68
  69     @Override
  70     public int compareTo(@Nullable ISegment o) {
  71         if (o == null) {
  72             throw new IllegalArgumentException();
  73         }
  74         return COMPARATOR.compare(this, o);
  75     }
  76
  77     @Override
  78     public String toString() {
  79         return new String('[' + String.valueOf(fStart) + ", " + String.valueOf(fEnd) + ']'); //$NON-NLS-1$
  80     }
  81 }