statesystem/org.eclipse.tracecompass.datastore.core/src/org/eclipse/tracecompass/datastore/core/interval/HTInterval.java

   1 /*******************************************************************************
   2  * Copyright (c) 2017 École Polytechnique de Montréal
   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.datastore.core.interval;
  11
  12 import java.util.Objects;
  13 import java.util.StringJoiner;
  14
  15 import org.eclipse.jdt.annotation.NonNull;
  16 import org.eclipse.jdt.annotation.Nullable;
  17 import org.eclipse.tracecompass.datastore.core.serialization.ISafeByteBufferWriter;
  18
  19 /**
  20  * Basic implementation of {@link IHTInterval}.
  21  *
  22  * @author Geneviève Bastien
  23  * @since 1.1
  24  */
  25 public class HTInterval implements IHTInterval {
  26
  27     private final long fStart;
  28     private final long fEnd;
  29
  30     /**
  31      * The object to use to read a BaseHtObject from the disk
  32      */
  33     public static final IHTIntervalReader<HTInterval> INTERVAL_READER =
  34         (buffer) -> new HTInterval(buffer.getLong(), buffer.getLong());
  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 HTInterval(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 String toString() {
  66         return (new StringJoiner(", ", "[", "]")) //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  67                 .add(String.valueOf(fStart))
  68                 .add(String.valueOf(fEnd))
  69                 .toString();
  70     }
  71
  72     @Override
  73     public int getSizeOnDisk() {
  74         return 2 * Long.BYTES;
  75     }
  76
  77     @Override
  78     public void writeSegment(@NonNull ISafeByteBufferWriter buffer) {
  79         buffer.putLong(fStart);
  80         buffer.putLong(fEnd);
  81     }
  82
  83     @Override
  84     public int hashCode() {
  85         return Objects.hash(fStart, fEnd);
  86     }
  87
  88     @Override
  89     public boolean equals(@Nullable Object obj) {
  90         if (obj == null) {
  91             return false;
  92         }
  93         if (obj.getClass() != getClass()) {
  94             return false;
  95         }
  96         HTInterval other = (HTInterval) obj;
  97         return (fStart == other.fStart
  98                 && fEnd == other.fEnd);
  99     }
 100
 101 }