tmf/org.eclipse.tracecompass.tmf.chart.ui/src/org/eclipse/tracecompass/internal/tmf/chart/ui/format/LabelFormat.java

   1 /*******************************************************************************
   2  * Copyright (c) 2016 École Polytechnique de Montréal
   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.internal.tmf.chart.ui.format;
  11
  12 import java.text.FieldPosition;
  13 import java.text.Format;
  14 import java.text.ParsePosition;
  15
  16 import org.eclipse.jdt.annotation.Nullable;
  17
  18 import com.google.common.collect.BiMap;
  19
  20 /**
  21  * Format label based on a given Map<String, Integer>.
  22  *
  23  * @author Jonathan Rajotte-Julien
  24  * @author Gabriel-Andrew Pollo-Guilbert
  25  */
  26 public class LabelFormat extends Format {
  27
  28     // ------------------------------------------------------------------------
  29     // Constants
  30     // ------------------------------------------------------------------------
  31
  32     private static final long serialVersionUID = -7046922375212377647L;
  33     private static final String CHART_EMPTY_LABEL = " "; //$NON-NLS-1$
  34
  35     // ------------------------------------------------------------------------
  36     // Members
  37     // ------------------------------------------------------------------------
  38
  39     private final BiMap<String, Integer> fMap;
  40
  41     // ------------------------------------------------------------------------
  42     // Constructors
  43     // ------------------------------------------------------------------------
  44
  45     /**
  46      * Constructor.
  47      *
  48      * @param map
  49      *            Map of labels and indices
  50      */
  51     public LabelFormat(BiMap<String, Integer> map) {
  52         super();
  53
  54         fMap = map;
  55     }
  56
  57     // ------------------------------------------------------------------------
  58     // Operations
  59     // ------------------------------------------------------------------------
  60
  61     @Override
  62     public @Nullable StringBuffer format(@Nullable Object obj, @Nullable StringBuffer toAppendTo, @Nullable FieldPosition pos) {
  63         if (obj == null || toAppendTo == null) {
  64             return new StringBuffer(CHART_EMPTY_LABEL);
  65         }
  66
  67         Double doubleObj = (Double) obj;
  68
  69         /* If the key is not contained in the map, format a empty label */
  70         if ((doubleObj % 1 != 0) || !fMap.containsValue((doubleObj.intValue()))) {
  71             return new StringBuffer(CHART_EMPTY_LABEL);
  72         }
  73
  74         /* If the value is null in the map, format an unknown label */
  75         String key = fMap.inverse().get(doubleObj.intValue());
  76
  77         return toAppendTo.append(key);
  78     }
  79
  80     @Override
  81     public @Nullable Object parseObject(@Nullable String source, @Nullable ParsePosition pos) {
  82         return fMap.get(source);
  83     }
  84
  85 }