bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier2.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.browsing.ui.graph.impl;\r
  13 \r
  14 import java.util.ArrayList;\r
  15 import java.util.Collections;\r
  16 import java.util.HashSet;\r
  17 import java.util.List;\r
  18 import java.util.Set;\r
  19 \r
  20 import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;\r
  21 import org.simantics.databoard.Bindings;\r
  22 import org.simantics.db.ReadGraph;\r
  23 import org.simantics.db.RequestProcessor;\r
  24 import org.simantics.db.Resource;\r
  25 import org.simantics.db.Session;\r
  26 import org.simantics.db.UndoContext;\r
  27 import org.simantics.db.VirtualGraph;\r
  28 import org.simantics.db.WriteGraph;\r
  29 import org.simantics.db.common.request.ObjectsWithType;\r
  30 import org.simantics.db.common.request.WriteRequest;\r
  31 import org.simantics.db.exception.DatabaseException;\r
  32 import org.simantics.db.layer0.variable.Variable;\r
  33 import org.simantics.db.layer0.variable.Variables;\r
  34 import org.simantics.db.request.Read;\r
  35 import org.simantics.layer0.Layer0;\r
  36 import org.simantics.utils.datastructures.Callback;\r
  37 import org.simantics.utils.ui.ErrorLogger;\r
  38 \r
  39 /**\r
  40  * @author Tuukka Lehtonen\r
  41  */\r
  42 public class EnumerationVariableModifier2 implements EnumerationModifier {\r
  43 \r
  44     protected final Session      session;\r
  45     protected final UndoContext  undoContext;\r
  46     protected final Variable     variable;\r
  47     protected final Set<String> allowedValues;\r
  48     protected final String       defaultValue;\r
  49 \r
  50     protected Throwable        modifierFailed;\r
  51 \r
  52     public EnumerationVariableModifier2(RequestProcessor processor, UndoContext undoContext, Variable variable) {\r
  53 \r
  54         this.session = processor.getSession();\r
  55         this.undoContext = undoContext;\r
  56         this.variable = variable;\r
  57         this.allowedValues = computeAllowedValues(processor, variable);\r
  58         this.defaultValue = computeDefaultValue(processor, variable);\r
  59         \r
  60     }\r
  61 \r
  62     protected String computeDefaultValue(RequestProcessor processor, final Variable variable) {\r
  63         try {\r
  64            return processor.syncRequest(new Read<String>() {\r
  65                 @Override\r
  66                 public String perform(ReadGraph graph) throws DatabaseException {\r
  67                         return variable.getPossiblePropertyValue(graph, Variables.LABEL);\r
  68                 }\r
  69             });\r
  70         } catch (DatabaseException e) {\r
  71             return "";\r
  72         }\r
  73     }\r
  74     \r
  75     protected Set<String> computeAllowedValues(RequestProcessor processor, final Variable variable) {\r
  76         try {\r
  77            return processor.syncRequest(new Read<Set<String>>() {\r
  78                 @Override\r
  79                 public Set<String> perform(ReadGraph graph) throws DatabaseException {\r
  80 \r
  81                         Layer0 L0 = Layer0.getInstance(graph);\r
  82                         Set<String> result = new HashSet<String>();\r
  83                         Resource literal = variable.getPossibleRepresents(graph);\r
  84                         Resource type = graph.getSingleObject(literal, L0.PartOf);\r
  85                         for(Resource lit : graph.syncRequest(new ObjectsWithType(type, L0.ConsistsOf, type))) {\r
  86                                 String label = graph.getPossibleRelatedValue(lit, L0.HasLabel);\r
  87                                 if(label == null) label = graph.getRelatedValue(lit, L0.HasName);\r
  88                                 result.add(label);\r
  89                         }\r
  90                         return result;\r
  91                         \r
  92                 }\r
  93             });\r
  94         } catch (DatabaseException e) {\r
  95             return Collections.emptySet();\r
  96         }\r
  97     }\r
  98 \r
  99     public class Write extends WriteRequest {\r
 100 \r
 101         final private Variable variable;\r
 102         final private String label;\r
 103 \r
 104         public Write(Variable variable, String label) {\r
 105             super((VirtualGraph)null);\r
 106             this.variable = variable;\r
 107             this.label = label;\r
 108         }\r
 109 \r
 110         @Override\r
 111         public void perform(WriteGraph graph) throws DatabaseException {\r
 112                 variable.setValue(graph, label, Bindings.STRING);\r
 113         }\r
 114 \r
 115     }\r
 116     \r
 117     protected void doModify(final String label) {\r
 118         session.asyncRequest(new Write(variable, label),\r
 119                 new Callback<DatabaseException>() {\r
 120             @Override\r
 121             public void run(DatabaseException parameter) {\r
 122                 if (parameter != null)\r
 123                     ErrorLogger.defaultLogError(parameter);\r
 124             }\r
 125         });\r
 126     }\r
 127 \r
 128     @Override\r
 129     public String getValue() {\r
 130         return defaultValue;\r
 131     }\r
 132 \r
 133     @Override\r
 134     public String isValid(String label) {\r
 135         if (modifierFailed != null)\r
 136             return "Could not resolve validator for this value, modification denied. Reason: "\r
 137             + modifierFailed.getMessage();\r
 138         // Validity should already be enforced by the editing UI for\r
 139         // enumerations.\r
 140         return null;\r
 141     }\r
 142 \r
 143     @Override\r
 144     public final void modify(String label) {\r
 145         if (modifierFailed != null)\r
 146             // Should never end up here, isValid should prevent it.\r
 147             throw new Error("modifier failed: " + modifierFailed.getMessage());\r
 148         doModify(label);\r
 149     }\r
 150 \r
 151     @Override\r
 152     public List<String> getValues() {\r
 153         ArrayList<String> result = new ArrayList<String>();\r
 154         result.addAll(allowedValues);\r
 155         return result;\r
 156     }\r
 157 \r
 158 };\r