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

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