analysis/org.eclipse.tracecompass.analysis.lami.ui/src/org/eclipse/tracecompass/internal/provisional/analysis/lami/ui/format/LamiLabelFormat.java

   1 /*******************************************************************************
   2  * Copyright (c) 2016 EfficiOS Inc., Jonathan Rajotte-Julien
   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.provisional.analysis.lami.ui.format;
  11
  12 import java.text.FieldPosition;
  13 import java.text.Format;
  14 import java.text.ParsePosition;
  15 import java.util.Map.Entry;
  16
  17
  18 import org.eclipse.jdt.annotation.Nullable;
  19
  20 import com.google.common.collect.BiMap;
  21
  22 /**
  23  * Format label based on a given Map<String, Integer>
  24  *
  25  * @author Jonathan Rajotte-Julien
  26  */
  27 public class LamiLabelFormat extends Format {
  28
  29     private static final long serialVersionUID = 4939553034329681316L;
  30
  31     private static final String SWTCHART_EMPTY_LABEL = " "; //$NON-NLS-1$
  32     private static final String UNKNOWN_REPRESENTATION = "?"; //$NON-NLS-1$
  33     private final BiMap<@Nullable String, Integer> fMap;
  34
  35     /**
  36      * Constructor
  37      *
  38      * @param map
  39      *            Map of indices to labels
  40      */
  41     public LamiLabelFormat(BiMap<@Nullable String, Integer> map) {
  42         super();
  43         fMap = map;
  44     }
  45
  46     @Override
  47     public @Nullable StringBuffer format(@Nullable Object obj, @Nullable StringBuffer toAppendTo, @Nullable FieldPosition pos) {
  48         if (obj == null || toAppendTo == null) {
  49             return new StringBuffer(SWTCHART_EMPTY_LABEL);
  50         }
  51
  52         Double doubleObj = (Double) obj;
  53
  54         /*
  55          * Return a string buffer with a space in it since SWT does not like to
  56          * draw empty strings.
  57          */
  58         if ((doubleObj % 1 != 0) || !fMap.containsValue((doubleObj.intValue()))) {
  59             return new StringBuffer(SWTCHART_EMPTY_LABEL);
  60         }
  61
  62         for (Entry<@Nullable String, Integer> entry : fMap.entrySet()) {
  63             /*
  64              * FIXME: Find if the elements are the same, based on their double
  65              * value, because SWTChart uses double values so we do the same
  66              * check. The loss of precision could lead to false positives.
  67              */
  68             if (Double.compare(entry.getValue().doubleValue(), doubleObj.doubleValue()) == 0) {
  69                 if (entry.getKey() == null) {
  70                     return new StringBuffer(UNKNOWN_REPRESENTATION);
  71                 }
  72                 return toAppendTo.append(entry.getKey());
  73             }
  74         }
  75         return new StringBuffer(SWTCHART_EMPTY_LABEL);
  76     }
  77
  78     @Override
  79     public @Nullable Object parseObject(@Nullable String source, @Nullable ParsePosition pos) {
  80         return fMap.get(source);
  81     }
  82
  83 }