analysis/org.eclipse.tracecompass.analysis.timing.ui/src/org/eclipse/tracecompass/analysis/timing/ui/views/segmentstore/SubSecondTimeWithUnitFormat.java

   1 /**********************************************************************
   2  * Copyright (c) 2015, 2016 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
  10 package org.eclipse.tracecompass.analysis.timing.ui.views.segmentstore;
  11
  12 import java.text.DecimalFormat;
  13 import java.text.FieldPosition;
  14 import java.text.Format;
  15 import java.text.ParsePosition;
  16
  17 import org.eclipse.jdt.annotation.Nullable;
  18 import org.eclipse.tracecompass.common.core.NonNullUtils;
  19
  20 /**
  21  * Time format, it will take a time in nano seconds and convert it to a string
  22  * with 3 decimals max.
  23  *
  24  * examples:
  25  * <ul>
  26  * <li>100 -> "100 ns"</li>
  27  * <li>1001 -> "1.001 us" (mu)</li>
  28  * <li>314159264 -> "312.159 ms"</li>
  29  * <li>10000002000000 -> "1000.002 s"</li>
  30  * </ul>
  31  */
  32 public final class SubSecondTimeWithUnitFormat extends Format {
  33
  34     private static final long serialVersionUID = -5147827135781459548L;
  35
  36     private static final String SECONDS = "s"; //$NON-NLS-1$
  37     private static final String NANOSECONDS = "ns"; //$NON-NLS-1$
  38     private static final String MILLISECONDS = "ms"; //$NON-NLS-1$
  39     private static final String MICROSECONDS = "\u00B5" + SECONDS; //$NON-NLS-1$
  40
  41     private static final int NANOS_PER_SEC = 1000000000;
  42     private static final int NANOS_PER_MILLI = 1000000;
  43     private static final int NANOS_PER_MICRO = 1000;
  44
  45     private final DecimalFormat fDecimalFormat = new DecimalFormat("#.000"); //$NON-NLS-1$
  46
  47     @Override
  48     public Object parseObject(@Nullable String source, @Nullable ParsePosition pos) {
  49         return source == null ? "" : source; //$NON-NLS-1$
  50     }
  51
  52     @Override
  53     public StringBuffer format(@Nullable Object obj, @Nullable StringBuffer toAppendTo, @Nullable FieldPosition pos) {
  54         final @Nullable StringBuffer appender = toAppendTo;
  55         if ((obj != null) && (obj instanceof Double || obj instanceof Long)) {
  56             double formattedTime = obj instanceof Long ? ((Long) obj).doubleValue() : ((Double) obj).doubleValue();
  57             if (Double.isNaN(formattedTime)) {
  58                 return appender == null ? new StringBuffer() : NonNullUtils.checkNotNull(appender.append("---")); //$NON-NLS-1$
  59             }
  60             String unit = NANOSECONDS;
  61             if (formattedTime >= NANOS_PER_SEC) {
  62                 unit = SECONDS;
  63                 formattedTime /= NANOS_PER_SEC;
  64             } else if (formattedTime >= NANOS_PER_MILLI) {
  65                 unit = MILLISECONDS;
  66                 formattedTime /= NANOS_PER_MILLI;
  67             } else if (formattedTime >= NANOS_PER_MICRO) {
  68                 unit = MICROSECONDS;
  69                 formattedTime /= NANOS_PER_MICRO;
  70             }
  71             if (formattedTime == 0) {
  72                 return appender == null ? new StringBuffer() : NonNullUtils.checkNotNull(appender.append(0));
  73             }
  74             String timeString = unit.equals(NANOSECONDS) ? Long.toString((long) formattedTime) : fDecimalFormat.format(formattedTime);
  75             return appender == null ? new StringBuffer() : NonNullUtils.checkNotNull(appender.append(timeString).append(' ').append(unit));
  76         }
  77         return new StringBuffer();
  78     }
  79 }