bundles/org.simantics.databoard/src/org/simantics/databoard/units/ConverterCreator.java

   1 /*******************************************************************************
   2  *  Copyright (c) 2010 Association for Decentralized Information Management in
   3  *  Industry THTH ry.
   4  *  All rights reserved. This program and the accompanying materials
   5  *  are made available under the terms of the Eclipse Public License v1.0
   6  *  which accompanies this distribution, and is available at
   7  *  http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  *  Contributors:
  10  *      VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.databoard.units;
  13
  14 import gnu.trove.map.hash.TObjectIntHashMap;
  15 import gnu.trove.procedure.TObjectIntProcedure;
  16
  17 import org.simantics.databoard.units.internal.library.UnitConversion;
  18 import org.simantics.databoard.units.internal.library.UnitLibrary;
  19 import org.simantics.databoard.units.internal.parser.UnitParser;
  20
  21 public class ConverterCreator extends UnitParser implements TObjectIntProcedure<String> {
  22
  23         UnitLibrary library;
  24         TObjectIntHashMap<String> exponents = new TObjectIntHashMap<String>();
  25         double scale = 1.0;
  26         int magnitude = 0;
  27
  28         public ConverterCreator(UnitLibrary library) {
  29                 this.library = library;
  30         }
  31
  32         @Override
  33         public void visit(String baseUnit, int exponent) {
  34                 if(exponents.adjustOrPutValue(baseUnit, exponent, exponent)==0)
  35                         exponents.remove(baseUnit);
  36         }
  37
  38         public IUnitConverter createConverter() {
  39                 if(exponents.isEmpty())
  40                         return IdentityConverter.INSTANCE;
  41                 TObjectIntHashMap<String> oldExponents = exponents;
  42                 exponents = new TObjectIntHashMap<String>();
  43                 oldExponents.forEachEntry(this);
  44                 if(exponents.isEmpty()) {
  45                         if(magnitude == 0 && scale == 1.0)
  46                                 return IdentityConverter.INSTANCE;
  47                         else
  48                                 return new LinearConverter(scale * Math.pow(10.0, magnitude));
  49                 }
  50                 else {
  51 //                      for(String u : exponents.keys(new String[exponents.size()]))
  52 //                              System.out.println(u + exponents.get(u));
  53                         return null;
  54                 }
  55         }
  56
  57         @Override
  58         public boolean execute(String unit, int exponent) {
  59                 UnitConversion conversion = library.getConversion(unit);
  60                 if(conversion == null) {
  61                         if(exponents.adjustOrPutValue(unit, exponent, exponent)==0)
  62                                 exponents.remove(unit);
  63                 }
  64                 else {
  65                         if(conversion.scale != 1.0)
  66                                 scale *= Math.pow(conversion.scale, exponent);
  67                         magnitude += conversion.magnitude * exponent;
  68                         for(int i=0;i<conversion.baseUnits.length;++i) {
  69                                 String u = conversion.baseUnits[i];
  70                                 int exp = conversion.exponents[i] * exponent;
  71                                 if(exponents.adjustOrPutValue(u, exp, exp)==0)
  72                                         exponents.remove(u);
  73                         }
  74                 }
  75                 return true;
  76         }
  77
  78 }