bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/StructuralRelatedObjectAccessor.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2013 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.objmap.structural.rules.domain;\r
  13 \r
  14 import java.util.ArrayList;\r
  15 import java.util.List;\r
  16 \r
  17 import org.apache.log4j.Logger;\r
  18 import org.simantics.db.ReadGraph;\r
  19 import org.simantics.db.Resource;\r
  20 import org.simantics.db.WriteGraph;\r
  21 import org.simantics.db.exception.DatabaseException;\r
  22 import org.simantics.objmap.exceptions.MappingException;\r
  23 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;\r
  24 import org.simantics.objmap.structural.StructuralResource;\r
  25 \r
  26 \r
  27 public class StructuralRelatedObjectAccessor implements IDomainAccessor<StructuralResource,StructuralResource> {\r
  28 \r
  29     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  30     \r
  31         Resource relation;\r
  32         boolean useTypeResource;\r
  33         \r
  34         private boolean preventStructuralChanges = true;\r
  35         private boolean preventStructuralRootChanges = true;\r
  36         \r
  37         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource) {\r
  38                 this.relation = relation;\r
  39                 this.useTypeResource = useTypeResource;\r
  40         }\r
  41         \r
  42         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {\r
  43                 this.relation = relation;\r
  44                 this.useTypeResource = useTypeResource;\r
  45                 this.preventStructuralChanges = preventStructuralChanges;\r
  46                 this.preventStructuralRootChanges = preventStructuralRootChanges;\r
  47         }\r
  48         \r
  49  private boolean preventChange(StructuralResource element) {\r
  50         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);       \r
  51     }\r
  52 \r
  53         @Override\r
  54         public StructuralResource get(ReadGraph g, StructuralResource element) throws MappingException {\r
  55                 try {\r
  56                         \r
  57                         LOGGER.info("        RelatedObjectAccessor.get");\r
  58                         \r
  59                         if (!element.isStructural())\r
  60                                 return null;\r
  61                         Resource instance = StructuralUtils.getContainingInstance(element);\r
  62                             \r
  63                         Resource publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);\r
  64 \r
  65                      if (publicRelation == null)\r
  66                         return null;\r
  67                         Resource r =  g.getPossibleObject(instance, publicRelation);\r
  68                         if (r == null)\r
  69                                 return null;\r
  70                         List<Resource> context = new ArrayList<Resource>();\r
  71                         for (int i = 0; i < element.getContext().size()-1; i++)\r
  72                                 context.add(element.getContext().get(i));\r
  73                         if (StructuralUtils.isStructuralInstance(g, r)) {\r
  74                                 return new StructuralResource(g, r, context,r);\r
  75                         } else {\r
  76                                 return new StructuralResource(g, r, context);\r
  77                         }\r
  78                 } catch (DatabaseException e) {\r
  79                         throw new MappingException(e);\r
  80                 }\r
  81         }\r
  82         \r
  83         @Override\r
  84         public boolean set(WriteGraph g, StructuralResource element, StructuralResource value)\r
  85                         throws MappingException {\r
  86                 try {\r
  87                     LOGGER.info("        RelatedObjectAccessor.set");\r
  88                     Resource instance = StructuralUtils.getContainingInstance(element);\r
  89                     Resource publicRelation = null;\r
  90                     if (instance == null)\r
  91                         return false;\r
  92                     publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);\r
  93                     if (value == null) {\r
  94                         if (publicRelation == null)\r
  95                                 return false;\r
  96                         if (preventChange(element))\r
  97                                 return false;\r
  98                         g.deny(instance, publicRelation);\r
  99                         return true;\r
 100                     } else {\r
 101                         if (publicRelation == null) {\r
 102                                 if (preventChange(element))\r
 103                                         return false;\r
 104                                 publicRelation = StructuralUtils.getOrCreatePublishedRelation(g, element, relation);\r
 105                                 g.claim(instance, publicRelation, value.getResource());\r
 106                                 return true;\r
 107                         } else {\r
 108                                 Resource r = g.getPossibleObject(instance, publicRelation);\r
 109                                 if (r == null) {\r
 110                                         if (preventChange(element))\r
 111                                                 return false;\r
 112                                         g.claim(instance, publicRelation, value.getResource());\r
 113                                         return true;\r
 114                                 } else {\r
 115                                         if (r.equals(value.getResource()))\r
 116                                                 return false;\r
 117                                         if (preventChange(element))\r
 118                                                 return false;\r
 119                                         g.deny(instance, publicRelation);\r
 120                                         g.claim(instance, publicRelation, value.getResource());\r
 121                                         return true;\r
 122                                 }\r
 123                         }\r
 124                     }\r
 125                 } catch (DatabaseException e) {\r
 126                         throw new MappingException(e);\r
 127                 }\r
 128                 \r
 129         }\r
 130 \r
 131 }\r