bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/expression/BasicExpression.java

   1 package org.simantics.modeling.ui.expression;\r
   2 \r
   3 import org.simantics.basicexpression.Expressions;\r
   4 import org.simantics.databoard.binding.Binding;\r
   5 import org.simantics.databoard.Bindings;\r
   6 import org.simantics.db.ReadGraph;\r
   7 import org.simantics.db.Resource;\r
   8 import org.simantics.db.WriteGraph;\r
   9 import org.simantics.db.exception.DatabaseException;\r
  10 import org.simantics.db.layer0.variable.EquationExpression;\r
  11 import org.simantics.db.layer0.variable.Expression;\r
  12 import org.simantics.db.layer0.variable.Variable;\r
  13 import org.simantics.utils.datastructures.Triple;\r
  14 \r
  15 public class BasicExpression implements Expression, EquationExpression {\r
  16 \r
  17         final private Resource expression;\r
  18         \r
  19         public BasicExpression(Resource expression) {\r
  20                 this.expression = expression;\r
  21         }\r
  22         \r
  23         @Override\r
  24         public <T> T evaluate(ReadGraph graph, Variable property, Binding binding) throws DatabaseException {\r
  25                 return evaluate(graph, property);\r
  26         }\r
  27 \r
  28         @SuppressWarnings("unchecked")\r
  29     @Override\r
  30         public <T> T evaluate(ReadGraph graph, Variable property) throws DatabaseException {\r
  31         \r
  32                 String expressionString = graph.getValue(expression, Bindings.STRING);\r
  33                 BasicExpressionVisitor visitor = new BasicExpressionVisitor(graph, property);\r
  34                 Expressions.evaluate(expressionString, visitor);\r
  35                 return (T)visitor.getResult();\r
  36                 \r
  37         }\r
  38 \r
  39         @Override\r
  40         public <T> void invert(WriteGraph graph, Variable property, T value, Binding binding) throws DatabaseException {\r
  41                 \r
  42                 String expressionString = graph.getValue(expression, Bindings.STRING);\r
  43                 InvertBasicExpressionVisitor visitor = new InvertBasicExpressionVisitor();\r
  44                 Expressions.evaluate(expressionString, visitor);\r
  45                 Object pair = visitor.getResult();\r
  46                 if(pair instanceof Triple) {\r
  47                         @SuppressWarnings("unchecked")\r
  48                         Triple<Double, Double, String> data = (Triple<Double, Double, String>)pair;\r
  49                         if(Math.abs(data.first) > 1e-9) {\r
  50                                 Double inverted = ((Double)value - data.second) / data.first;\r
  51                                 String target = data.third;\r
  52                                 Variable targetVariable = property.browse(graph, target);\r
  53 //                              System.out.println("invert: " + target + " = " + property.browse(graph, target).getURI(graph));\r
  54                                 targetVariable.setValue(graph, inverted, binding);\r
  55                         }\r
  56                 }\r
  57                 \r
  58         }\r
  59 \r
  60         @Override\r
  61         public boolean isInvertible(ReadGraph graph, Variable property) throws DatabaseException {\r
  62                 \r
  63                 String expressionString = graph.getValue(expression, Bindings.STRING);\r
  64                 InvertBasicExpressionVisitor visitor = new InvertBasicExpressionVisitor();\r
  65                 Expressions.evaluate(expressionString, visitor);\r
  66                 Object value = visitor.getResult();\r
  67                 if(value instanceof Triple) return true;\r
  68                 else return false;\r
  69                 \r
  70         }\r
  71 \r
  72 }\r