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