bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Negation.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.Resource;
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.WriteGraph;
  19 import org.simantics.db.exception.DatabaseException;
  20
  21 public class Negation extends UnaryPredicate {
  22
  23         IUnaryPredicate predicate;
  24
  25         public Negation(IUnaryPredicate predicate) {
  26                 this.predicate = predicate;
  27         }
  28
  29         @Override
  30         public void add(WriteGraph g, Resource r) throws DatabaseException {
  31                 predicate.remove(g, r);
  32         }
  33
  34         @Override
  35         public Collection<Resource> getResources(ReadGraph g) {
  36                 throw new UnsupportedOperationException();
  37         }
  38
  39         @Override
  40         public boolean has(ReadGraph g, Resource resource) throws DatabaseException {
  41                 return !predicate.has(g, resource);
  42         }
  43
  44         @Override
  45         public void remove(WriteGraph g, Resource r) throws DatabaseException {
  46                 predicate.add(g, r);
  47         }
  48
  49         @Override
  50         public boolean supportsAddition() {
  51                 return predicate.supportsRemoval();
  52         }
  53
  54         @Override
  55         public boolean supportsRemoval() {
  56                 return predicate.supportsAddition();
  57         }
  58
  59         @Override
  60         public boolean supportsUnboundedQuery() {
  61                 return false;
  62         }
  63
  64         @Override
  65         public int hashCode() {
  66                 final int prime = 31;
  67                 int result = 1;
  68                 result = prime * result
  69                                 + ((predicate == null) ? 0 : predicate.hashCode());
  70                 return result;
  71         }
  72
  73         @Override
  74         public boolean equals(Object obj) {
  75                 if (this == obj)
  76                         return true;
  77                 if (obj == null)
  78                         return false;
  79                 if (getClass() != obj.getClass())
  80                         return false;
  81                 Negation other = (Negation) obj;
  82                 if (predicate == null) {
  83                         if (other.predicate != null)
  84                                 return false;
  85                 } else if (!predicate.equals(other.predicate))
  86                         return false;
  87                 return true;
  88         }
  89
  90 }