bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/instantiation/Instance.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 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.layer0.utils.instantiation;
  13
  14 import java.util.ArrayList;
  15 import java.util.List;
  16
  17 import org.simantics.db.ReadGraph;
  18 import org.simantics.db.Resource;
  19 import org.simantics.db.WriteGraph;
  20 import org.simantics.db.common.utils.Literals;
  21 import org.simantics.db.common.utils.NameUtils;
  22 import org.simantics.db.exception.DatabaseException;
  23
  24
  25 public class Instance {
  26
  27     public static class RelatedInstance {
  28         Resource relation;
  29         Instance instance;
  30         int      cardinality;
  31     }
  32
  33     public Resource              equals           = null;
  34     public List<RelatedInstance> relatedInstances = new ArrayList<RelatedInstance>();
  35     public Object                value            = null;
  36
  37     public Instance() {
  38     }
  39
  40     public Instance(Resource equals) {
  41         this.equals = equals;
  42     }
  43
  44     public Resource instantiate(WriteGraph graph) throws DatabaseException {
  45         if(equals != null)
  46             return equals;
  47         Resource ret = graph.newResource();
  48         for(RelatedInstance instance : relatedInstances)
  49             for(int i=0;i<instance.cardinality;++i)
  50                 graph.claim(ret, instance.relation,
  51                         instance.instance.instantiate(graph));
  52         if(value != null)
  53             graph.claimValue(ret, value);
  54         return ret;
  55     }
  56
  57     public Resource instantiateUsing(WriteGraph graph, Resource resource) throws DatabaseException {
  58         if(equals != null)
  59             return equals;
  60         Resource ret = resource;
  61         for(RelatedInstance instance : relatedInstances)
  62             for(int i=0;i<instance.cardinality;++i)
  63                 graph.claim(ret, instance.relation,
  64                         instance.instance.instantiate(graph));
  65         if(value != null)
  66             graph.claimValue(ret, value);
  67         return ret;
  68     }
  69
  70     public void print(StringBuilder builder, int indentation, ReadGraph graph) throws DatabaseException {
  71         ++ indentation;
  72         if(equals != null) {
  73             builder.append(NameUtils.getSafeName(graph, equals));
  74         }
  75         else {
  76             if(value != null) {
  77                 builder.append(Literals.literalToString(value));
  78                 builder.append(" : ");
  79             }
  80             else
  81                 builder.append("* : ");
  82 //            boolean first = true;
  83
  84             for(RelatedInstance instance : relatedInstances) {
  85                 builder.append("\n");
  86                 for(int i=0;i<indentation;++i)
  87                     builder.append("    ");
  88                 builder.append(NameUtils.getSafeName(graph, instance.relation));
  89                 if(instance.cardinality != 1)
  90                     builder.append("[" + instance.cardinality + "]");
  91                 builder.append(" = ");
  92                 instance.instance.print(builder, indentation, graph);
  93             }
  94
  95         }
  96     }
  97
  98     public String toString(ReadGraph graph) throws DatabaseException {
  99         StringBuilder builder = new StringBuilder();
 100         print(builder, 0, graph);
 101         return builder.toString();
 102     }
 103
 104 }