statesystem/org.eclipse.tracecompass.datastore.core/src/org/eclipse/tracecompass/internal/provisional/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.internal.provisional.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.internal.provisional.datastore.core.serialization.ISafeByteBufferWriter;
  18
  19 /**
  20  * Basic implementation of {@link IHTInterval}.
  21  *
  22  * @author Geneviève Bastien
  23  */
  24 public class HTInterval implements IHTInterval {
  25
  26     private final long fStart;
  27     private final long fEnd;
  28
  29     /**
  30      * The object to use to read a BaseHtObject from the disk
  31      */
  32     public static final IHTIntervalReader<HTInterval> INTERVAL_READER =
  33         (buffer) -> new HTInterval(buffer.getLong(), buffer.getLong());
  34
  35     /**
  36      * Create a new segment.
  37      *
  38      * The end position should be equal to or greater than the start position.
  39      *
  40      * @param start
  41      *            Start position of the segment
  42      * @param end
  43      *            End position of the segment
  44      */
  45     public HTInterval(long start, long end) {
  46         if (end < start) {
  47             throw new IllegalArgumentException();
  48         }
  49         fStart = start;
  50         fEnd = end;
  51     }
  52
  53     @Override
  54     public long getStart() {
  55         return fStart;
  56     }
  57
  58     @Override
  59     public long getEnd() {
  60         return fEnd;
  61     }
  62
  63     @Override
  64     public String toString() {
  65         return (new StringJoiner(", ", "[", "]")) //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  66                 .add(String.valueOf(fStart))
  67                 .add(String.valueOf(fEnd))
  68                 .toString();
  69     }
  70
  71     @Override
  72     public int getSizeOnDisk() {
  73         return 2 * Long.BYTES;
  74     }
  75
  76     @Override
  77     public void writeSegment(@NonNull ISafeByteBufferWriter buffer) {
  78         buffer.putLong(fStart);
  79         buffer.putLong(fEnd);
  80     }
  81
  82     @Override
  83     public int hashCode() {
  84         return Objects.hash(fStart, fEnd);
  85     }
  86
  87     @Override
  88     public boolean equals(@Nullable Object obj) {
  89         if (obj == null) {
  90             return false;
  91         }
  92         if (obj.getClass() != getClass()) {
  93             return false;
  94         }
  95         HTInterval other = (HTInterval) obj;
  96         return (fStart == other.fStart
  97                 && fEnd == other.fEnd);
  98     }
  99
 100 }