org.eclipse.linuxtools.lttng.core/src/org/eclipse/linuxtools/internal/lttng/core/event/LttngTimestamp.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 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  *   William Bourque (wbourque@gmail.com) - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.internal.lttng.core.event;
  14
  15 import org.eclipse.linuxtools.tmf.core.event.ITmfTimestamp;
  16 import org.eclipse.linuxtools.tmf.core.event.TmfTimestamp;
  17
  18 /**
  19  * <b><u>LttngTimestamp</u></b><p>
  20  *
  21  * Lttng specific implementation of the TmfTimestamp.<p>
  22  *
  23  * The Lttng implementation is the same as the basic Tmf Implementation but allow construction with a TmfTimestamp or a long.
  24  */
  25 public class LttngTimestamp extends TmfTimestamp {
  26
  27     /**
  28      * Default Constructor.<p>
  29      *
  30      */
  31     public LttngTimestamp() {
  32         this(Long.MIN_VALUE);
  33     }
  34
  35     /**
  36      * Constructor with parameters.<p>
  37      *
  38      * @param newEventTime    Time as long, unit expected to be nanoseconds
  39      */
  40     public LttngTimestamp(final long newEventTime) {
  41         super(newEventTime, -9, 0);
  42     }
  43
  44     /**
  45      * Copy Constructor.<p>
  46      *
  47      * @param oldEventTime    The timestamp object we want to copy from
  48      */
  49     public LttngTimestamp(final ITmfTimestamp oldEventTime) {
  50         this(oldEventTime.getValue());
  51     }
  52
  53     public void setValue(final long newValue) {
  54         setValue(newValue, -9, 0);
  55     }
  56
  57     /**
  58      * Get the second part in timestamp.<p>
  59      *
  60      * Note : We do not use scale and assumes contents to be in nano seconds.
  61      *
  62      * @return Seconds in the object, in string.
  63      */
  64     public String getSeconds() {
  65         return formatSecs(getValue());
  66     }
  67
  68     /**
  69      * Get the nanosecond part in timestamp.<p>
  70      *
  71      * Note : We do not use scale and assumes contents to be in nanoseconds.
  72      *
  73      * @return Seconds in the object, in string.
  74      */
  75     public String getNanoSeconds() {
  76         return formatNs(getValue());
  77     }
  78
  79     /*
  80      * Use the exponent to format the second in the correct format.
  81      */
  82     private String formatSecs(final long time) {
  83         final long sec = (long) (time * 1E-9);
  84         return String.valueOf(sec);
  85     }
  86
  87     /*
  88      * Obtains the remainder fraction on unit Seconds of the entered value in
  89      * nanoseconds. e.g. input: 1241207054171080214 ns.
  90      * The number of fraction seconds can be obtained by removing the last 9 digits:
  91      * In 1241207054, the fractional portion of seconds, expressed in ns is: 171080214
  92      */
  93     private String formatNs(long time) {
  94         final boolean neg = time < 0;
  95         if (neg)
  96             time = -time;
  97         // The following approach could be used although performance
  98         // decreases in half.
  99         // String strVal = String.format("%09d", time);
 100         // String tmp = strVal.substring(strVal.length() - 9)
 101         final StringBuffer temp = new StringBuffer();
 102         long ns = time;
 103         ns %= 1000000000;
 104         if (ns < 10)
 105             temp.append("00000000"); //$NON-NLS-1$
 106         else if (ns < 100)
 107             temp.append("0000000"); //$NON-NLS-1$
 108         else if (ns < 1000)
 109             temp.append("000000"); //$NON-NLS-1$
 110         else if (ns < 10000)
 111             temp.append("00000"); //$NON-NLS-1$
 112         else if (ns < 100000)
 113             temp.append("0000"); //$NON-NLS-1$
 114         else if (ns < 1000000)
 115             temp.append("000"); //$NON-NLS-1$
 116         else if (ns < 10000000)
 117             temp.append("00"); //$NON-NLS-1$
 118         else if (ns < 100000000)
 119             temp.append("0"); //$NON-NLS-1$
 120
 121         temp.append(ns);
 122         return temp.toString();
 123     }
 124
 125
 126     /**
 127      * toString() method.
 128      *
 129      * @return timestamp, as string
 130      */
 131     @Override
 132     @SuppressWarnings("nls")
 133     public String toString() {
 134
 135         int scale = getScale();
 136         long value = getValue();
 137         if (value < 0)
 138             value = -value;
 139
 140         final StringBuilder sb = new StringBuilder(String.valueOf(value));
 141
 142         // Prepend the correct number of "0" so we can insert a "." at the right location
 143         final int nbZeroes = (-scale) - sb.length() + 1;
 144         for (int i = 0; i < nbZeroes; i++)
 145             sb.insert(i, "0");
 146         sb.insert(sb.length() + scale, ".");
 147
 148         // Prepend "-" if negative
 149         if (getValue() < 0)
 150             sb.insert(0, "-");
 151
 152         return sb.toString();
 153     }
 154
 155     @Override
 156     public LttngTimestamp clone() {
 157         return (LttngTimestamp) super.clone();
 158     }
 159
 160     /**
 161      * Compute the delta between two timestamps (adjusted to scale of current timestamp).
 162      *
 163      * @param reference the reference timestamp to synchronize with
 164      * @return the delta timestamp
 165      * @throws ArithmeticException
 166      */
 167     @Override
 168     public LttngTimestamp getDelta(final ITmfTimestamp other) {
 169         final TmfTimestamp delta = (TmfTimestamp) super.getDelta(other);
 170         return new LttngTimestamp(delta);
 171     }
 172 }