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

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