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.slf4j.Logger;
  18 import org.slf4j.LoggerFactory;
  19 import org.simantics.db.ReadGraph;
  20 import org.simantics.db.Resource;
  21 import org.simantics.db.WriteGraph;
  22 import org.simantics.db.exception.DatabaseException;
  23 import org.simantics.objmap.exceptions.MappingException;
  24 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
  25 import org.simantics.objmap.structural.StructuralResource;
  26
  27
  28 public class StructuralRelatedObjectAccessor implements IDomainAccessor<StructuralResource,StructuralResource> {
  29
  30     static Logger LOGGER = LoggerFactory.getLogger(StructuralRelatedObjectAccessor.class);
  31
  32         Resource relation;
  33         boolean useTypeResource;
  34
  35         private boolean preventStructuralChanges = true;
  36         private boolean preventStructuralRootChanges = true;
  37
  38         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource) {
  39                 this.relation = relation;
  40                 this.useTypeResource = useTypeResource;
  41         }
  42
  43         public StructuralRelatedObjectAccessor(Resource relation, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {
  44                 this.relation = relation;
  45                 this.useTypeResource = useTypeResource;
  46                 this.preventStructuralChanges = preventStructuralChanges;
  47                 this.preventStructuralRootChanges = preventStructuralRootChanges;
  48         }
  49
  50  private boolean preventChange(StructuralResource element) {
  51         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);
  52     }
  53
  54         @Override
  55         public StructuralResource get(ReadGraph g, StructuralResource element) throws MappingException {
  56                 try {
  57
  58                         LOGGER.info("        RelatedObjectAccessor.get");
  59
  60                         if (!element.isStructural())
  61                                 return null;
  62                         Resource instance = StructuralUtils.getContainingInstance(element);
  63
  64                         Resource publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);
  65
  66                      if (publicRelation == null)
  67                         return null;
  68                         Resource r =  g.getPossibleObject(instance, publicRelation);
  69                         if (r == null)
  70                                 return null;
  71                         List<Resource> context = new ArrayList<Resource>();
  72                         for (int i = 0; i < element.getContext().size()-1; i++)
  73                                 context.add(element.getContext().get(i));
  74                         if (StructuralUtils.isStructuralInstance(g, r)) {
  75                                 return new StructuralResource(g, r, context,r);
  76                         } else {
  77                                 return new StructuralResource(g, r, context);
  78                         }
  79                 } catch (DatabaseException e) {
  80                         throw new MappingException(e);
  81                 }
  82         }
  83
  84         @Override
  85         public boolean set(WriteGraph g, StructuralResource element, StructuralResource value)
  86                         throws MappingException {
  87                 try {
  88                     LOGGER.info("        RelatedObjectAccessor.set");
  89                     Resource instance = StructuralUtils.getContainingInstance(element);
  90                     Resource publicRelation = null;
  91                     if (instance == null)
  92                         return false;
  93                     publicRelation = StructuralUtils.getPublishedRelation(g, element, relation);
  94                     if (value == null) {
  95                         if (publicRelation == null)
  96                                 return false;
  97                         if (preventChange(element))
  98                                 return false;
  99                         g.deny(instance, publicRelation);
 100                         return true;
 101                     } else {
 102                         if (publicRelation == null) {
 103                                 if (preventChange(element))
 104                                         return false;
 105                                 publicRelation = StructuralUtils.getOrCreatePublishedRelation(g, element, relation);
 106                                 g.claim(instance, publicRelation, value.getResource());
 107                                 return true;
 108                         } else {
 109                                 Resource r = g.getPossibleObject(instance, publicRelation);
 110                                 if (r == null) {
 111                                         if (preventChange(element))
 112                                                 return false;
 113                                         g.claim(instance, publicRelation, value.getResource());
 114                                         return true;
 115                                 } else {
 116                                         if (r.equals(value.getResource()))
 117                                                 return false;
 118                                         if (preventChange(element))
 119                                                 return false;
 120                                         g.deny(instance, publicRelation);
 121                                         g.claim(instance, publicRelation, value.getResource());
 122                                         return true;
 123                                 }
 124                         }
 125                     }
 126                 } catch (DatabaseException e) {
 127                         throw new MappingException(e);
 128                 }
 129
 130         }
 131
 132 }