bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Conjunction.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.ArrayList;\r
  15 import java.util.Arrays;\r
  16 import java.util.Collection;\r
  17 \r
  18 import org.simantics.db.Resource;\r
  19 import org.simantics.db.ReadGraph;\r
  20 import org.simantics.db.WriteGraph;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 \r
  23 public class Conjunction extends UnaryPredicate {\r
  24 \r
  25         Collection<IUnaryPredicate> predicates;\r
  26         IUnaryPredicate support;\r
  27 \r
  28         public Conjunction(Collection<IUnaryPredicate> predicates) {\r
  29                 for(IUnaryPredicate pred : predicates)\r
  30                         if(pred.supportsUnboundedQuery()) {\r
  31                                 this.support = pred;\r
  32                                 this.predicates = new ArrayList<IUnaryPredicate>(predicates.size()-1);\r
  33                                 for(IUnaryPredicate pred2 : predicates)\r
  34                                         if(pred != pred2)\r
  35                                                 this.predicates.add(pred2);\r
  36                                 return;\r
  37                         }\r
  38                 this.predicates = predicates;\r
  39                 this.support = null;\r
  40         }\r
  41         \r
  42         public Conjunction(IUnaryPredicate ... predicates) {\r
  43         this(Arrays.asList(predicates));\r
  44     }\r
  45 \r
  46         @Override\r
  47         public Collection<Resource> getResources(ReadGraph g) throws DatabaseException {\r
  48                 Collection<Resource> result = new ArrayList<Resource>();\r
  49                 ll:     for(Resource r : support.getResources(g)) {                     \r
  50                         for(IUnaryPredicate pred : predicates)\r
  51                                 if(!pred.has(g, r))\r
  52                                         continue ll;\r
  53                         result.add(r);\r
  54                 }\r
  55                 return result;\r
  56         }\r
  57 \r
  58         @Override\r
  59         public boolean has(ReadGraph g, Resource resource) throws DatabaseException {\r
  60                 for(IUnaryPredicate pred : predicates)\r
  61                         if(!pred.has(g, resource))\r
  62                                 return false;\r
  63                 return support == null || support.has(g, resource);\r
  64         }\r
  65 \r
  66         @Override\r
  67         public boolean supportsUnboundedQuery() {               \r
  68                 return support != null;\r
  69         }       \r
  70         \r
  71         @Override\r
  72         public void add(WriteGraph g, Resource r) {\r
  73                 throw new UnsupportedOperationException();\r
  74         }\r
  75 \r
  76         @Override\r
  77         public void remove(WriteGraph g, Resource r) {\r
  78                 throw new UnsupportedOperationException();\r
  79         }\r
  80 \r
  81         @Override\r
  82         public boolean supportsAddition() {\r
  83                 return false;\r
  84         }\r
  85 \r
  86         @Override\r
  87         public boolean supportsRemoval() {              \r
  88                 return false;\r
  89         }\r
  90 \r
  91         @Override\r
  92         public int hashCode() {\r
  93                 final int prime = 31;\r
  94                 int result = 1;\r
  95                 result = prime * result\r
  96                                 + ((predicates == null) ? 0 : predicates.hashCode());\r
  97                 return result;\r
  98         }\r
  99 \r
 100         @Override\r
 101         public boolean equals(Object obj) {\r
 102                 if (this == obj)\r
 103                         return true;\r
 104                 if (obj == null)\r
 105                         return false;\r
 106                 if (getClass() != obj.getClass())\r
 107                         return false;\r
 108                 Conjunction other = (Conjunction) obj;\r
 109                 if (predicates == null) {\r
 110                         if (other.predicates != null)\r
 111                                 return false;\r
 112                 } else if (!predicates.equals(other.predicates))\r
 113                         return false;\r
 114                 return true;\r
 115         }\r
 116                 \r
 117 }\r