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

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