bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/RelatedObjectAccessor.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 org.apache.log4j.Logger;\r
  15 import org.simantics.db.ReadGraph;\r
  16 import org.simantics.db.Resource;\r
  17 import org.simantics.db.WriteGraph;\r
  18 import org.simantics.db.exception.DatabaseException;\r
  19 import org.simantics.objmap.exceptions.MappingException;\r
  20 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;\r
  21 import org.simantics.objmap.structural.StructuralResource;\r
  22 \r
  23 \r
  24 public class RelatedObjectAccessor implements IDomainAccessor<StructuralResource,StructuralResource> {\r
  25 \r
  26     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");\r
  27     \r
  28         Resource relation;\r
  29         boolean useTypeResource;\r
  30         \r
  31         private boolean preventStructuralChanges = true;\r
  32         private boolean preventStructuralRootChanges = true;\r
  33         \r
  34         public RelatedObjectAccessor(Resource relation, boolean useTypeResource) {\r
  35                 this.relation = relation;\r
  36                 this.useTypeResource = useTypeResource;\r
  37         }\r
  38         \r
  39         public RelatedObjectAccessor(Resource relation, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {\r
  40                 this.relation = relation;\r
  41                 this.useTypeResource = useTypeResource;\r
  42                 this.preventStructuralChanges = preventStructuralChanges;\r
  43                 this.preventStructuralRootChanges = preventStructuralRootChanges;\r
  44         }\r
  45         \r
  46  private boolean preventChange(StructuralResource element) {\r
  47         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);       \r
  48     }\r
  49 \r
  50         @Override\r
  51         public StructuralResource get(ReadGraph g, StructuralResource element) throws MappingException {\r
  52                 try {\r
  53                     LOGGER.info("        RelatedObjectAccessor.get");\r
  54                     Resource res = getServiceResource(g, element);\r
  55                     if (res == null)\r
  56                         return null;\r
  57                         Resource r =  g.getPossibleObject(res, relation);\r
  58                         if (r == null)\r
  59                                 return null;\r
  60                         if (StructuralUtils.isStructuralInstance(g, r)) {\r
  61                                 return new StructuralResource(g, r, element.getContext(),r);\r
  62                         } else {\r
  63                                 return new StructuralResource(g, r, element.getContext());\r
  64                         }\r
  65                 } catch (DatabaseException e) {\r
  66                         throw new MappingException(e);\r
  67                 }\r
  68         }\r
  69         \r
  70         @Override\r
  71         public boolean set(WriteGraph g, StructuralResource selement, StructuralResource value)\r
  72                         throws MappingException {\r
  73                 try {\r
  74                     LOGGER.info("        RelatedObjectAccessor.set");\r
  75                     Resource element = getServiceResource(g, selement);\r
  76                     if (element == null)\r
  77                         return false;\r
  78                     Resource resource = g.getPossibleObject(element, relation);\r
  79                         if(resource == null) {\r
  80                             if(value == null)\r
  81                                 return false;\r
  82                             if (preventChange(selement))\r
  83                                         return false;\r
  84                             g.claim(element, relation, value.getResource());\r
  85                             return true;\r
  86                         }\r
  87                         else if(resource.equals(value))\r
  88                             return false;\r
  89                         else {\r
  90                                 if (preventChange(selement))\r
  91                                         return false;\r
  92                             g.deny(element, relation);\r
  93                             if(value != null)\r
  94                                 g.claim(element, relation, value.getResource());\r
  95                             return true;\r
  96                         }\r
  97                 } catch (DatabaseException e) {\r
  98                         throw new MappingException(e);\r
  99                 }\r
 100                 \r
 101         }\r
 102         \r
 103                 \r
 104         \r
 105         private Resource getServiceResource(ReadGraph g, StructuralResource element) {\r
 106                 if(!useTypeResource)\r
 107                         return element.getResource();\r
 108                 return element.getTypeResource();\r
 109         }\r
 110 \r
 111 }\r