bundles/org.simantics.databoard/src/org/simantics/databoard/Units.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;
  13
  14 import org.simantics.databoard.units.ConverterCreator;
  15 import org.simantics.databoard.units.IUnitConverter;
  16 import org.simantics.databoard.units.IdentityConverter;
  17 import org.simantics.databoard.units.internal.UnitParseException;
  18 import org.simantics.databoard.units.internal.library.UnitLibrary;
  19
  20 public class Units {
  21
  22         public static UnitLibrary library = UnitLibrary.createDefault();
  23
  24         /**
  25          * Create converter
  26          *
  27          * @param sourceUnit
  28          * @param targetUnit
  29          * @return the converter
  30          * @throws UnitParseException
  31          */
  32         public static IUnitConverter createConverter(String sourceUnit, String targetUnit) throws UnitParseException {
  33                 if(sourceUnit.equals(targetUnit))
  34                         return IdentityConverter.INSTANCE;
  35                 ConverterCreator creator = new ConverterCreator(library);
  36                 creator.unit(sourceUnit, 1);
  37                 creator.unit(targetUnit, -1);
  38                 return creator.createConverter();
  39         }
  40
  41         public static double convert(double value, String sourceUnit, String targetUnit) throws UnitParseException {
  42                 IUnitConverter c = createConverter(sourceUnit, targetUnit);
  43                 if (c==null) throw new UnitParseException(sourceUnit+" or "+targetUnit, "could not convert");
  44                 return c.convert(value);
  45         }
  46
  47
  48 }