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