tmf/org.eclipse.tracecompass.tmf.core/src/org/eclipse/tracecompass/tmf/core/timestamp/TmfTimestampDelta.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2014 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made 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:
  10  *   Bernd Hufmann - Initial API and implementation
  11  *******************************************************************************/
  12 package org.eclipse.tracecompass.tmf.core.timestamp;
  13
  14 import java.util.TimeZone;
  15
  16 /**
  17  * A generic timestamp implementation for delta between timestamps. The
  18  * toString() method takes negative values into consideration.
  19  *
  20  * @author Bernd Hufmann
  21  */
  22 public class TmfTimestampDelta extends TmfTimestamp {
  23
  24     // ------------------------------------------------------------------------
  25     // Members
  26     // ------------------------------------------------------------------------
  27
  28     private final long fValue;
  29     private final int fScale;
  30
  31     // ------------------------------------------------------------------------
  32     // Constructors
  33     // ------------------------------------------------------------------------
  34     /**
  35      * Default constructor
  36      */
  37     public TmfTimestampDelta() {
  38         this(0, ITmfTimestamp.SECOND_SCALE);
  39     }
  40
  41     /**
  42      * Simple constructor (scale = precision = 0)
  43      *
  44      * @param value
  45      *            the timestamp value
  46      */
  47
  48     public TmfTimestampDelta(long value) {
  49         this(value, ITmfTimestamp.SECOND_SCALE);
  50     }
  51
  52     /**
  53      * Constructor
  54      *
  55      * @param value
  56      *            the timestamp value
  57      * @param scale
  58      *            the timestamp scale
  59      */
  60     public TmfTimestampDelta(long value, int scale) {
  61         fValue = value;
  62         fScale = scale;
  63     }
  64
  65     /**
  66      * Copy constructor
  67      *
  68      * @param timestamp
  69      *            the timestamp to copy
  70      */
  71     public TmfTimestampDelta(ITmfTimestamp timestamp) {
  72         this(timestamp.getValue(), timestamp.getScale());
  73     }
  74
  75     // ------------------------------------------------------------------------
  76     // Operations
  77     // ------------------------------------------------------------------------
  78
  79     @Override
  80     public long getValue() {
  81         return fValue;
  82     }
  83
  84     @Override
  85     public int getScale() {
  86         return fScale;
  87     }
  88
  89     @Override
  90     public ITmfTimestamp normalize(final long offset, final int scale) {
  91         ITmfTimestamp nts = super.normalize(offset, scale);
  92         return new TmfTimestampDelta(nts.getValue(), nts.getScale());
  93     }
  94
  95     @Override
  96     public String toString() {
  97         return toString(TmfTimestampFormat.getDefaulIntervalFormat());
  98     }
  99
 100     @Override
 101     public String toString(TmfTimestampFormat format) {
 102         if (getValue() < 0) {
 103             TmfTimestampDelta tmpTs = new TmfTimestampDelta(-getValue(), getScale());
 104             return "-" + tmpTs.toString(format); //$NON-NLS-1$
 105         }
 106         TmfTimestampFormat deltaFormat = new TmfTimestampFormat(format.toPattern());
 107         deltaFormat.setTimeZone(TimeZone.getTimeZone("UTC")); //$NON-NLS-1$
 108         return super.toString(deltaFormat);
 109     }
 110 }