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