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