bundles/org.simantics.mapping/src/org/simantics/mapping/rule/IfRule.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in 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.mapping.rule;
  13
  14 import gnu.trove.map.hash.TObjectIntHashMap;
  15
  16 import org.simantics.db.Resource;
  17 import org.simantics.mapping.constraint.IConstraint;
  18 import org.simantics.mapping.constraint.TooManyUnboundVariablesException;
  19 import org.simantics.mapping.constraint.instructions.IInstruction;
  20 import org.simantics.mapping.rule.instructions.IRuleInstruction;
  21 import org.simantics.mapping.rule.instructions.IfRuleInstruction;
  22 import org.simantics.utils.datastructures.persistent.ImmutableSet;
  23
  24 public class IfRule implements IRule {
  25
  26         IConstraint condition;
  27         IRule thenRule;
  28         IRule elseRule;
  29
  30         public IfRule(IConstraint condition, IRule thenRule, IRule elseRule) {
  31                 this.condition = condition;
  32                 this.thenRule = thenRule;
  33                 this.elseRule = elseRule;
  34         }
  35
  36         public IfRule(IConstraint condition, IRule thenRule) {
  37                 this(condition, thenRule, null);
  38         }
  39
  40         @Override
  41         public ImmutableSet<Resource> binds() {
  42                 ImmutableSet<Resource> ret = condition.binds().addAll(thenRule.binds());
  43                 if(elseRule != null)
  44                         ret = ret.addAll(elseRule.binds());
  45                 return ret;
  46         }
  47
  48         @Override
  49         public IRuleInstruction createInstruction(
  50                         TObjectIntHashMap<Resource> variableIds,
  51                         ImmutableSet<Resource> bound) throws TooManyUnboundVariablesException {
  52                 IInstruction conditionInstruction =
  53                         condition.createInstruction(variableIds, bound);
  54                 bound = bound.addAll(condition.binds());
  55                 return new IfRuleInstruction(conditionInstruction,
  56                                 thenRule.createInstruction(variableIds, bound),
  57                                 elseRule == null ? null : elseRule.createInstruction(variableIds, bound));
  58         }
  59
  60 }