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.content.Labeler.EnumerationModifier;
  17 import org.simantics.databoard.Bindings;
  18 import org.simantics.db.ReadGraph;
  19 import org.simantics.db.RequestProcessor;
  20 import org.simantics.db.Session;
  21 import org.simantics.db.VirtualGraph;
  22 import org.simantics.db.WriteGraph;
  23 import org.simantics.db.common.request.WriteRequest;
  24 import org.simantics.db.exception.DatabaseException;
  25 import org.simantics.db.layer0.variable.Variable;
  26 import org.simantics.db.layer0.variable.Variables;
  27 import org.simantics.db.request.Read;
  28 import org.simantics.utils.datastructures.Callback;
  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           //            System.err.println(variable.getURI(graph));
  59                         return variable.getValue(graph);//variable.getPossiblePropertyValue(graph, Variables.LABEL);
  60                 }
  61             });
  62         } catch (DatabaseException e) {
  63             return "";
  64         }
  65     }
  66
  67     public class Write extends WriteRequest {
  68
  69         final private Variable variable;
  70         final private String label;
  71
  72         public Write(Variable variable, String label) {
  73             super((VirtualGraph)null);
  74             this.variable = variable;
  75             this.label = label;
  76         }
  77
  78         @Override
  79         public void perform(WriteGraph graph) throws DatabaseException {
  80                 variable.setValue(graph, label, Bindings.STRING);
  81         }
  82
  83     }
  84
  85     protected void doModify(final String label) {
  86         session.asyncRequest(new Write(variable, label),
  87                 new Callback<DatabaseException>() {
  88             @Override
  89             public void run(DatabaseException parameter) {
  90                 if (parameter != null)
  91                     ErrorLogger.defaultLogError(parameter);
  92             }
  93         });
  94     }
  95
  96     @Override
  97     public String getValue() {
  98         return defaultValue;
  99     }
 100
 101     @Override
 102     public String isValid(String label) {
 103         if (modifierFailed != null)
 104             return "Could not resolve validator for this value, modification denied. Reason: "
 105             + modifierFailed.getMessage();
 106         // Validity should already be enforced by the editing UI for
 107         // enumerations.
 108         return null;
 109     }
 110
 111     @Override
 112     public final void modify(String label) {
 113         if (modifierFailed != null)
 114             // Should never end up here, isValid should prevent it.
 115             throw new Error("modifier failed: " + modifierFailed.getMessage());
 116         doModify(label);
 117     }
 118
 119     @Override
 120     public List<String> getValues() {
 121         return allowedValues;
 122     }
 123
 124 };