1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.browsing.ui.graph.impl;
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14 import java.util.List;
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16 import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;
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17 import org.simantics.db.ReadGraph;
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18 import org.simantics.db.RequestProcessor;
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19 import org.simantics.db.Session;
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20 import org.simantics.db.UndoContext;
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21 import org.simantics.db.common.request.ReadRequest;
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22 import org.simantics.db.exception.DatabaseException;
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23 import org.simantics.db.layer0.variable.Variable;
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24 import org.simantics.db.layer0.variable.VariableWrite;
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25 import org.simantics.utils.datastructures.Callback;
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26 import org.simantics.utils.ui.ErrorLogger;
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29 * @author Tuukka Lehtonen
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31 public class EnumerationVariableModifier implements EnumerationModifier {
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33 protected final Session session;
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34 protected final UndoContext undoContext;
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35 protected final Variable variable;
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36 protected final List<String> allowedValues;
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37 protected final String defaultValue;
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39 private String initialValue;
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40 protected Throwable modifierFailed;
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42 public EnumerationVariableModifier(RequestProcessor processor, UndoContext undoContext, Variable variable,
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43 List<String> allowedValues, String defaultValue) {
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44 this.session = processor.getSession();
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45 this.undoContext = undoContext;
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46 this.variable = variable;
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47 this.allowedValues = allowedValues;
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48 this.defaultValue = defaultValue;
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50 initializeModifier(processor);
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53 protected void initializeModifier(RequestProcessor processor) {
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55 processor.syncRequest(new ReadRequest() {
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57 public void run(ReadGraph graph) throws DatabaseException {
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58 initialValue = getInitialValue(graph);
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61 } catch (DatabaseException e) {
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66 protected void doModify(final String label) {
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67 session.asyncRequest(new VariableWrite(variable, label, null, null),
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68 new Callback<DatabaseException>() {
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70 public void run(DatabaseException parameter) {
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71 if (parameter != null)
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72 ErrorLogger.defaultLogError(parameter);
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77 protected String getInitialValue(ReadGraph graph) throws DatabaseException {
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78 Object value = variable.getValue(graph);
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79 return value == null ? defaultValue : value.toString();
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83 public String getValue() {
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84 return initialValue;
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88 public String isValid(String label) {
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89 if (modifierFailed != null)
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90 return "Could not resolve validator for this value, modification denied. Reason: "
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91 + modifierFailed.getMessage();
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92 // Validity should already be enforced by the editing UI for
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98 public final void modify(String label) {
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99 if (modifierFailed != null)
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100 // Should never end up here, isValid should prevent it.
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101 throw new Error("modifier failed: " + modifierFailed.getMessage());
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106 public List<String> getValues() {
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107 return allowedValues;
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