bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier3.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.List;
  15
  16 import org.simantics.browsing.ui.common.modifiers.EnumerationValue;
  17 import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;
  18 import org.simantics.databoard.Bindings;
  19 import org.simantics.db.ReadGraph;
  20 import org.simantics.db.RequestProcessor;
  21 import org.simantics.db.Resource;
  22 import org.simantics.db.Session;
  23 import org.simantics.db.VirtualGraph;
  24 import org.simantics.db.WriteGraph;
  25 import org.simantics.db.common.request.WriteRequest;
  26 import org.simantics.db.exception.DatabaseException;
  27 import org.simantics.db.layer0.variable.Variable;
  28 import org.simantics.db.request.Read;
  29 import org.simantics.utils.ui.ErrorLogger;
  30
  31 /**
  32  * @author Tuukka Lehtonen
  33  */
  34 public class EnumerationVariableModifier3 implements EnumerationModifier {
  35
  36     protected final Session      session;
  37     protected final Variable     variable;
  38     protected final List<String> allowedValues;
  39     protected final String       defaultValue;
  40
  41     protected Throwable        modifierFailed;
  42
  43     public EnumerationVariableModifier3(RequestProcessor processor, Variable variable, List<String> allowedValues) {
  44
  45         this.session = processor.getSession();
  46         this.variable = variable;
  47         this.allowedValues = allowedValues;
  48         this.defaultValue = computeDefaultValue(processor, variable);
  49         //System.err.println(this.defaultValue);
  50
  51     }
  52
  53     protected String computeDefaultValue(RequestProcessor processor, final Variable variable) {
  54         try {
  55            return processor.syncRequest(new Read<String>() {
  56                 @Override
  57                 public String perform(ReadGraph graph) throws DatabaseException {
  58                     EnumerationValue<Resource> ev = graph.syncRequest(new GetEnumerationValue(variable.getParent(graph).getRepresents(graph)));
  59                     if(ev != null) {
  60                             return ev.getEnumeratedValue().getName();
  61                     }
  62           //            System.err.println(variable.getURI(graph));
  63                         return variable.getValue(graph);//variable.getPossiblePropertyValue(graph, Variables.LABEL);
  64                 }
  65             });
  66         } catch (DatabaseException e) {
  67             return "";
  68         }
  69     }
  70
  71     public class Write extends WriteRequest {
  72
  73         final private Variable variable;
  74         final private String label;
  75
  76         public Write(Variable variable, String label) {
  77             super((VirtualGraph)null);
  78             this.variable = variable;
  79             this.label = label;
  80         }
  81
  82         @Override
  83         public void perform(WriteGraph graph) throws DatabaseException {
  84                 variable.setValue(graph, label, Bindings.STRING);
  85         }
  86
  87     }
  88
  89     protected void doModify(final String label) {
  90         session.asyncRequest(new Write(variable, label),
  91                 parameter -> {
  92                     if (parameter != null)
  93                         ErrorLogger.defaultLogError(parameter);
  94         });
  95     }
  96
  97     @Override
  98     public String getValue() {
  99         return defaultValue;
 100     }
 101
 102     @Override
 103     public String isValid(String label) {
 104         if (modifierFailed != null)
 105             return "Could not resolve validator for this value, modification denied. Reason: "
 106             + modifierFailed.getMessage();
 107         // Validity should already be enforced by the editing UI for
 108         // enumerations.
 109         return null;
 110     }
 111
 112     @Override
 113     public final void modify(String label) {
 114         if (modifierFailed != null)
 115             // Should never end up here, isValid should prevent it.
 116             throw new Error("modifier failed: " + modifierFailed.getMessage());
 117         doModify(label);
 118     }
 119
 120     @Override
 121     public List<String> getValues() {
 122         return allowedValues;
 123     }
 124
 125 };