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.apache.log4j.Logger;
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.Statement;
  20 import org.simantics.db.WriteGraph;
  21 import org.simantics.db.exception.DatabaseException;
  22 import org.simantics.layer0.Layer0;
  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 RelatedValueAccessor implements IDomainAccessor<StructuralResource,Object> {
  29
  30     static Logger LOGGER = Logger.getLogger("org.simantics.objmap");
  31
  32         Resource relation;
  33         Resource valueType;
  34         boolean useTypeResource;
  35
  36         private boolean preventStructuralChanges = true;
  37         private boolean preventStructuralRootChanges = true;
  38
  39         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource) {
  40                 this.relation = relation;
  41                 this.valueType = valueType;
  42                 this.useTypeResource = useTypeResource;
  43         }
  44
  45         public RelatedValueAccessor(Resource relation, Resource valueType, boolean useTypeResource, boolean preventStructuralChanges, boolean preventStructuralRootChanges) {
  46                 this.relation = relation;
  47                 this.valueType = valueType;
  48                 this.useTypeResource = useTypeResource;
  49                 this.preventStructuralChanges = preventStructuralChanges;
  50                 this.preventStructuralRootChanges = preventStructuralRootChanges;
  51         }
  52
  53         private boolean preventChange(StructuralResource element) {
  54         return preventStructuralChanges && element.isStructural() && (!element.isStructuralRoot()||preventStructuralRootChanges);
  55     }
  56
  57         @Override
  58         public Object get(ReadGraph g, StructuralResource element) throws MappingException {
  59                 try {
  60                     LOGGER.info("        RelatedValueAccessor.get");
  61                     Resource res = getServiceResource(g, element);
  62                     if (res == null)
  63                         return null;
  64                         Resource valueResource = g.getPossibleObject(res, relation);
  65                         if(valueResource == null)
  66                                 return null;
  67                         return g.getValue(valueResource);
  68                 } catch (DatabaseException e) {
  69                         throw new MappingException(e);
  70                 }
  71         }
  72
  73         @Override
  74         public boolean set(WriteGraph g, StructuralResource relement, Object value)
  75                         throws MappingException {
  76                 try {
  77                     LOGGER.info("        RelatedValueAccessor.set");
  78
  79                     Resource element = getServiceResource(g, relement);
  80                     if (element == null)
  81                         return false;
  82                     Statement valueStatement = g.getPossibleStatement(element, relation);
  83                         if(valueStatement == null) {
  84                                 if(value == null)
  85                                         return false;
  86                                 if (preventChange(relement))
  87                                         return false;
  88                                 Resource valueResource = g.newResource();
  89                                 g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
  90                                                 valueType);
  91                                 g.claim(element, relation, valueResource);
  92                                 g.claimValue(valueResource, value);
  93                                 return true;
  94                         }
  95                         else {
  96                                 if(value == null) {
  97                                         if (preventChange(relement))
  98                                                 return false;
  99                                         if (!valueStatement.isAsserted(element)) {
 100                                                 g.deny(valueStatement.getObject());
 101                                                 return true;
 102                                         } else {
 103                                                 return false;
 104                                         }
 105
 106                                 }
 107                                 Object currentValue = g.getValue(valueStatement.getObject());
 108                                 if(equals(currentValue,value))
 109                                         return false;
 110                                 if (preventChange(relement))
 111                                         return false;
 112                                 if (!valueStatement.isAsserted(element))
 113                                         g.claimValue(valueStatement.getObject(), value);
 114                                 else {
 115                                         Resource valueResource = g.newResource();
 116                                         g.claim(valueResource, Layer0.getInstance(g).InstanceOf, null,
 117                                                         valueType);
 118                                         g.claim(element, relation, valueResource);
 119                                         g.claimValue(valueResource, value);
 120                                 }
 121                                 return true;
 122                         }
 123                 } catch (DatabaseException e) {
 124                         throw new MappingException(e);
 125                 }
 126
 127         }
 128
 129         private Resource getServiceResource(ReadGraph g, StructuralResource element) {
 130                 if (!useTypeResource)
 131                         return element.getResource();
 132                 return element.getTypeResource();
 133         }
 134
 135         private boolean equals(Object o1, Object o2) {
 136                 if (o1 instanceof boolean[])
 137                         Arrays.equals((boolean[])o1,(boolean[])o2);
 138                 if (o1 instanceof int[])
 139                         Arrays.equals((int[])o1,(int[])o2);
 140                 if (o1 instanceof float[])
 141                         Arrays.equals((float[])o1,(float[])o2);
 142                 if (o1 instanceof double[])
 143                         Arrays.equals((double[])o1,(double[])o2);
 144                 if (o1 instanceof byte[])
 145                         Arrays.equals((byte[])o1,(byte[])o2);
 146                 return o1.equals(o2);
 147
 148         }
 149
 150 }