bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/StructuralRelatedObjectAccessor.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 java.util.ArrayList;
  15 import java.util.List;
  16
  17 import org.apache.log4j.Logger;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.WriteGraph;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.objmap.exceptions.MappingException;
  23 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
  24 import org.simantics.objmap.structural.StructuralResource;
  25
  26
  27 public class StructuralRelatedObjectAccessor implements IDomainAccessor<StructuralResource,StructuralResource> {
  28
  29     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
  30
  31         Resource relation;
  32         boolean useTypeResource;
  33
  34         private boolean preventStructuralChanges = true;
  35         private boolean preventStructuralRootChanges = true;
  36
  37         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource) {
  38                 this.relation = relation;
  39                 this.useTypeResource = useTypeResource;
  40         }
  41
  42         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {
  43                 this.relation = relation;
  44                 this.useTypeResource = useTypeResource;
  45                 this.preventStructuralChanges = preventStructuralChanges;
  46                 this.preventStructuralRootChanges = preventStructuralRootChanges;
  47         }
  48
  49  private boolean preventChange(StructuralResource element) {
  50         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);
  51     }
  52
  53         @Override
  54         public StructuralResource get(ReadGraph g, StructuralResource element) throws MappingException {
  55                 try {
  56
  57                         LOGGER.info("        RelatedObjectAccessor.get");
  58
  59                         if (!element.isStructural())
  60                                 return null;
  61                         Resource instance = StructuralUtils.getContainingInstance(element);
  62
  63                         Resource publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);
  64
  65                      if (publicRelation == null)
  66                         return null;
  67                         Resource r =  g.getPossibleObject(instance, publicRelation);
  68                         if (r == null)
  69                                 return null;
  70                         List<Resource> context = new ArrayList<Resource>();
  71                         for (int i = 0; i < element.getContext().size()-1; i++)
  72                                 context.add(element.getContext().get(i));
  73                         if (StructuralUtils.isStructuralInstance(g, r)) {
  74                                 return new StructuralResource(g, r, context,r);
  75                         } else {
  76                                 return new StructuralResource(g, r, context);
  77                         }
  78                 } catch (DatabaseException e) {
  79                         throw new MappingException(e);
  80                 }
  81         }
  82
  83         @Override
  84         public boolean set(WriteGraph g, StructuralResource element, StructuralResource value)
  85                         throws MappingException {
  86                 try {
  87                     LOGGER.info("        RelatedObjectAccessor.set");
  88                     Resource instance = StructuralUtils.getContainingInstance(element);
  89                     Resource publicRelation = null;
  90                     if (instance == null)
  91                         return false;
  92                     publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);
  93                     if (value == null) {
  94                         if (publicRelation == null)
  95                                 return false;
  96                         if (preventChange(element))
  97                                 return false;
  98                         g.deny(instance, publicRelation);
  99                         return true;
 100                     } else {
 101                         if (publicRelation == null) {
 102                                 if (preventChange(element))
 103                                         return false;
 104                                 publicRelation = StructuralUtils.getOrCreatePublishedRelation(g, element, relation);
 105                                 g.claim(instance, publicRelation, value.getResource());
 106                                 return true;
 107                         } else {
 108                                 Resource r = g.getPossibleObject(instance, publicRelation);
 109                                 if (r == null) {
 110                                         if (preventChange(element))
 111                                                 return false;
 112                                         g.claim(instance, publicRelation, value.getResource());
 113                                         return true;
 114                                 } else {
 115                                         if (r.equals(value.getResource()))
 116                                                 return false;
 117                                         if (preventChange(element))
 118                                                 return false;
 119                                         g.deny(instance, publicRelation);
 120                                         g.claim(instance, publicRelation, value.getResource());
 121                                         return true;
 122                                 }
 123                         }
 124                     }
 125                 } catch (DatabaseException e) {
 126                         throw new MappingException(e);
 127                 }
 128
 129         }
 130
 131 }