bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Type.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 import org.simantics.layer0.Layer0;\r
  21 \r
  22 public class Type extends UnaryPredicate {\r
  23 \r
  24         Resource type;\r
  25 \r
  26         public Type(Resource type) {\r
  27                 this.type = type;\r
  28         }\r
  29         \r
  30         public Resource getType() {\r
  31         return type;\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 g.isInstanceOf(resource, type);\r
  42         }\r
  43 \r
  44         @Override\r
  45         public boolean supportsUnboundedQuery() {\r
  46                 return false;\r
  47         }\r
  48 \r
  49         @Override\r
  50         public void add(WriteGraph g, Resource r) throws DatabaseException {\r
  51         Layer0 b = Layer0.getInstance(g);\r
  52                 if(!g.isInstanceOf(r, type))\r
  53                         g.claim(r, b.InstanceOf, null, type);\r
  54         }\r
  55 \r
  56         @Override\r
  57         public void remove(WriteGraph g, Resource r) throws DatabaseException {\r
  58                 // FIXME not implemented correctly\r
  59         Layer0 b = Layer0.getInstance(g);\r
  60                 if(g.isInstanceOf(r, type))\r
  61                         g.denyStatement(r, b.InstanceOf, type);\r
  62         }\r
  63 \r
  64         @Override\r
  65         public boolean supportsAddition() {\r
  66                 return true;\r
  67         }\r
  68 \r
  69         @Override\r
  70         public boolean supportsRemoval() {\r
  71                 return false;\r
  72         }\r
  73 \r
  74         @Override\r
  75         public int hashCode() {\r
  76                 final int prime = 31;\r
  77                 int result = 1;\r
  78                 result = prime * result + ((type == null) ? 0 : type.hashCode());\r
  79                 return result;\r
  80         }\r
  81 \r
  82         @Override\r
  83         public boolean equals(Object obj) {\r
  84                 if (this == obj)\r
  85                         return true;\r
  86                 if (obj == null)\r
  87                         return false;\r
  88                 if (getClass() != obj.getClass())\r
  89                         return false;\r
  90                 Type other = (Type) obj;\r
  91                 if (type == null) {\r
  92                         if (other.type != null)\r
  93                                 return false;\r
  94                 } else if (!type.equals(other.type))\r
  95                         return false;\r
  96                 return true;\r
  97         }\r
  98         \r
  99 }\r