bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/BinaryPredicateConstraint.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.constraint;\r
  13 \r
  14 import gnu.trove.map.hash.TObjectIntHashMap;\r
  15 \r
  16 import org.simantics.db.Resource;\r
  17 import org.simantics.layer0.utils.binaryPredicates.IBinaryPredicate;\r
  18 import org.simantics.mapping.constraint.instructions.BinaryPredicateInstruction;\r
  19 import org.simantics.mapping.constraint.instructions.BinaryPredicateObjectQuery;\r
  20 import org.simantics.mapping.constraint.instructions.BinaryPredicateSubjectQuery;\r
  21 import org.simantics.mapping.constraint.instructions.IInstruction;\r
  22 import org.simantics.utils.datastructures.persistent.ImmutableSet;\r
  23 \r
  24 public class BinaryPredicateConstraint implements IConstraint {\r
  25 \r
  26         Resource variable0;\r
  27         Resource variable1;\r
  28         IBinaryPredicate predicate;             \r
  29 \r
  30         public BinaryPredicateConstraint(IBinaryPredicate predicate,\r
  31                         Resource variable0, Resource variable1) {\r
  32                 this.predicate = predicate;\r
  33                 this.variable0 = variable0;\r
  34                 this.variable1 = variable1;\r
  35         }\r
  36 \r
  37         @Override\r
  38         public ImmutableSet<Resource> binds() {\r
  39                 return ImmutableSet.of(variable0, variable1);\r
  40         }\r
  41 \r
  42         @Override\r
  43         public IInstruction createInstruction(\r
  44                         TObjectIntHashMap<Resource> variableIds,\r
  45                         ImmutableSet<Resource> bound) throws TooManyUnboundVariablesException {\r
  46                 int id0 = variableIds.get(variable0);\r
  47                 int id1 = variableIds.get(variable1);\r
  48                 if(bound.contains(variable0)) {\r
  49                         if(bound.contains(variable1))\r
  50                                 return new BinaryPredicateInstruction(id0, id1, predicate);\r
  51                         else\r
  52                                 return new BinaryPredicateObjectQuery(id0, id1, predicate);\r
  53                 }\r
  54                 else {\r
  55                         if(bound.contains(variable1))\r
  56                                 return new BinaryPredicateSubjectQuery(id0, id1, predicate);\r
  57                         else\r
  58                                 throw new TooManyUnboundVariablesException();                   \r
  59                 }\r
  60         }\r
  61 \r
  62         @Override\r
  63         public int isApplicable(ImmutableSet<Resource> bound) {\r
  64                 if(bound.contains(variable0)) {\r
  65                         if(bound.contains(variable1))\r
  66                                 return Integer.MAX_VALUE;\r
  67                         else if(predicate.supportsGetObjects())\r
  68                                 return Integer.MAX_VALUE;\r
  69                         else\r
  70                                 return 0;\r
  71                 }\r
  72                 else {\r
  73                         if(bound.contains(variable1) && predicate.supportsGetSubjects())\r
  74                                 return Integer.MAX_VALUE;\r
  75                         else \r
  76                                 return 0;\r
  77                 }\r
  78         }\r
  79 \r
  80 }\r