bundles/org.simantics.scl.compiler/src/org/simantics/scl/compiler/elaboration/java/CheckRelation.java

   1 package org.simantics.scl.compiler.elaboration.java;
   2
   3 import org.simantics.scl.compiler.constants.BooleanConstant;
   4 import org.simantics.scl.compiler.elaboration.expressions.ELiteral;
   5 import org.simantics.scl.compiler.elaboration.expressions.EVariable;
   6 import org.simantics.scl.compiler.elaboration.expressions.Variable;
   7 import org.simantics.scl.compiler.elaboration.query.compilation.QueryCompilationContext;
   8 import org.simantics.scl.compiler.elaboration.relations.AbstractRelation;
   9 import org.simantics.scl.compiler.types.TVar;
  10 import org.simantics.scl.compiler.types.Type;
  11 import org.simantics.scl.compiler.types.Types;
  12
  13 public class CheckRelation extends AbstractRelation {
  14     public static final CheckRelation INSTANCE = new CheckRelation();
  15
  16     private CheckRelation() {}
  17
  18     @Override
  19     public TVar[] getTypeVariables() {
  20         return TVar.EMPTY_ARRAY;
  21     }
  22
  23     private static final Type[] PARAMETER_TYPES = new Type[] {Types.BOOLEAN};
  24
  25     @Override
  26     public Type[] getParameterTypes() {
  27         return PARAMETER_TYPES;
  28     }
  29
  30     @Override
  31     public int getPhase() {
  32         return 0;
  33     }
  34
  35     @Override
  36     public double getSelectivity(int boundVariables) {
  37         switch(boundVariables) {
  38         case F: return 1.0;
  39         case B: return 0.1;
  40         default: throw new IllegalArgumentException();
  41         }
  42     }
  43
  44     @Override
  45     public int getRequiredVariablesMask() {
  46         return F;
  47     }
  48
  49     @Override
  50     public void generate(long location,
  51             QueryCompilationContext context,
  52             Type[] typeParameters, Variable[] parameters, int boundVariables) {
  53         switch(boundVariables) {
  54         case F:
  55             context.let(parameters[0], new ELiteral(new BooleanConstant(true)));
  56             break;
  57         case B:
  58             context.condition(new EVariable(parameters[0]));
  59             break;
  60         default: throw new IllegalArgumentException();
  61         }
  62     }
  63
  64     @Override
  65     public String toString() {
  66         return "Check";
  67     }
  68
  69 }