bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/SuperRelation.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.layer0.utils.predicates;\r
  13 \r
  14 import java.util.Collection;\r
  15 \r
  16 import org.simantics.db.ReadGraph;\r
  17 import org.simantics.db.Resource;\r
  18 import org.simantics.db.WriteGraph;\r
  19 import org.simantics.db.exception.DatabaseException;\r
  20 import org.simantics.layer0.Layer0;\r
  21 \r
  22 public class SuperRelation extends UnaryPredicate {\r
  23 \r
  24         Resource superrelation;\r
  25 \r
  26         public SuperRelation(Resource superrelation) {\r
  27                 this.superrelation = superrelation;\r
  28         }\r
  29 \r
  30         @Override\r
  31         public Collection<Resource> getResources(ReadGraph g) {\r
  32                 throw new UnsupportedOperationException();\r
  33         }\r
  34 \r
  35         @Override\r
  36         public boolean has(ReadGraph g, Resource resource) throws DatabaseException {\r
  37                 return g.isSubrelationOf(resource, superrelation);\r
  38         }\r
  39 \r
  40         @Override\r
  41         public boolean supportsUnboundedQuery() {\r
  42                 return false;\r
  43         }\r
  44 \r
  45         @Override\r
  46         public void add(WriteGraph g, Resource r) throws DatabaseException {\r
  47                 if(!g.isSubrelationOf(r, superrelation)) {\r
  48                 Layer0 b = Layer0.getInstance(g);\r
  49                         g.claim(r, b.SubrelationOf, superrelation);\r
  50                         if(!g.hasStatement(r, b.InverseOf)) {\r
  51                                 Resource invR = g.newResource();\r
  52                                 g.claim(r, b.InverseOf, invR);\r
  53                                 g.claim(invR, b.SubrelationOf, g.getInverse(superrelation));\r
  54                         }\r
  55                 }\r
  56         }\r
  57 \r
  58         @Override\r
  59         public void remove(WriteGraph g, Resource r) throws DatabaseException {\r
  60                 // FIXME not implemented correctly\r
  61         Layer0 b = Layer0.getInstance(g);\r
  62                 if(g.isSubrelationOf(r, superrelation))\r
  63                         g.denyStatement(r, b.SubrelationOf, superrelation);\r
  64         }\r
  65 \r
  66         @Override\r
  67         public boolean supportsAddition() {\r
  68                 return true;\r
  69         }\r
  70 \r
  71         @Override\r
  72         public boolean supportsRemoval() {\r
  73                 return false;\r
  74         }\r
  75 \r
  76         @Override\r
  77         public int hashCode() {\r
  78                 final int prime = 31;\r
  79                 int result = 1;\r
  80                 result = prime * result + ((superrelation == null) ? 0 : superrelation.hashCode());\r
  81                 return result;\r
  82         }\r
  83 \r
  84         @Override\r
  85         public boolean equals(Object obj) {\r
  86                 if (this == obj)\r
  87                         return true;\r
  88                 if (obj == null)\r
  89                         return false;\r
  90                 if (getClass() != obj.getClass())\r
  91                         return false;\r
  92                 SuperRelation other = (SuperRelation) obj;\r
  93                 if (superrelation == null) {\r
  94                         if (other.superrelation != null)\r
  95                                 return false;\r
  96                 } else if (!superrelation.equals(other.superrelation))\r
  97                         return false;\r
  98                 return true;\r
  99         }\r
 100         \r
 101 }\r