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