bundles/org.simantics.objmap2/src/org/simantics/objmap/structural/rules/domain/RelatedValueAccessor.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.Arrays;
  15
  16 import org.slf4j.Logger;
  17 import org.slf4j.LoggerFactory;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.Resource;
  20 import org.simantics.db.Statement;
  21 import org.simantics.db.WriteGraph;
  22 import org.simantics.db.exception.DatabaseException;
  23 import org.simantics.layer0.Layer0;
  24 import org.simantics.objmap.exceptions.MappingException;
  25 import org.simantics.objmap.graph.rules.domain.IDomainAccessor;
  26 import org.simantics.objmap.structural.StructuralResource;
  27
  28
  29 public class RelatedValueAccessor implements IDomainAccessor<StructuralResource,Object> {
  30
  31     static Logger LOGGER = LoggerFactory.getLogger(RelatedValueAccessor.class);
  32
  33         Resource relation;
  34         Resource valueType;
  35         boolean useTypeResource;
  36
  37         private boolean preventStructuralChanges = true;
  38         private boolean preventStructuralRootChanges = true;
  39
  40         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource) {
  41                 this.relation = relation;
  42                 this.valueType = valueType;
  43                 this.useTypeResource = useTypeResource;
  44         }
  45
  46         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {
  47                 this.relation = relation;
  48                 this.valueType = valueType;
  49                 this.useTypeResource = useTypeResource;
  50                 this.preventStructuralChanges = preventStructuralChanges;
  51                 this.preventStructuralRootChanges = preventStructuralRootChanges;
  52         }
  53
  54         private boolean preventChange(StructuralResource element) {
  55         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);
  56     }
  57
  58         @Override
  59         public Object get(ReadGraph g, StructuralResource element) throws MappingException {
  60                 try {
  61                     LOGGER.trace("        RelatedValueAccessor.get");
  62                     Resource res = getServiceResource(g, element);
  63                     if (res == null)
  64                         return null;
  65                         Resource valueResource = g.getPossibleObject(res, relation);
  66                         if(valueResource == null)
  67                                 return null;
  68                         return g.getValue(valueResource);
  69                 } catch (DatabaseException e) {
  70                         throw new MappingException(e);
  71                 }
  72         }
  73
  74         @Override
  75         public boolean set(WriteGraph g, StructuralResource relement, Object value)
  76                         throws MappingException {
  77                 try {
  78                     LOGGER.trace("        RelatedValueAccessor.set");
  79
  80                     Resource element = getServiceResource(g, relement);
  81                     if (element == null)
  82                         return false;
  83                     Statement valueStatement = g.getPossibleStatement(element, relation);
  84                         if(valueStatement == null) {
  85                                 if(value == null)
  86                                         return false;
  87                                 if (preventChange(relement))
  88                                         return false;
  89                                 Resource valueResource = g.newResource();
  90                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  91                                                 valueType);
  92                                 g.claim(element, relation, valueResource);
  93                                 g.claimValue(valueResource, value);
  94                                 return true;
  95                         }
  96                         else {
  97                                 if(value == null) {
  98                                         if (preventChange(relement))
  99                                                 return false;
 100                                         if (!valueStatement.isAsserted(element)) {
 101                                                 g.deny(valueStatement.getObject());
 102                                                 return true;
 103                                         } else {
 104                                                 return false;
 105                                         }
 106
 107                                 }
 108                                 Object currentValue = g.getValue(valueStatement.getObject());
 109                                 if(equals(currentValue,value))
 110                                         return false;
 111                                 if (preventChange(relement))
 112                                         return false;
 113                                 if (!valueStatement.isAsserted(element))
 114                                         g.claimValue(valueStatement.getObject(), value);
 115                                 else {
 116                                         Resource valueResource = g.newResource();
 117                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
 118                                                         valueType);
 119                                         g.claim(element, relation, valueResource);
 120                                         g.claimValue(valueResource, value);
 121                                 }
 122                                 return true;
 123                         }
 124                 } catch (DatabaseException e) {
 125                         throw new MappingException(e);
 126                 }
 127
 128         }
 129
 130         private Resource getServiceResource(ReadGraph g, StructuralResource element) {
 131                 if (!useTypeResource)
 132                         return element.getResource();
 133                 return element.getTypeResource();
 134         }
 135
 136         private boolean equals(Object o1, Object o2) {
 137                 if (o1 instanceof boolean[])
 138                         Arrays.equals((boolean[])o1,(boolean[])o2);
 139                 if (o1 instanceof int[])
 140                         Arrays.equals((int[])o1,(int[])o2);
 141                 if (o1 instanceof float[])
 142                         Arrays.equals((float[])o1,(float[])o2);
 143                 if (o1 instanceof double[])
 144                         Arrays.equals((double[])o1,(double[])o2);
 145                 if (o1 instanceof byte[])
 146                         Arrays.equals((byte[])o1,(byte[])o2);
 147                 return o1.equals(o2);
 148
 149         }
 150
 151 }