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.modeling.ui.diagram.monitor;
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14 import org.simantics.basicexpression.Expressions;
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15 import org.simantics.basicexpression.analysis.ExpressionException;
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16 import org.simantics.common.format.Formatter;
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17 import org.simantics.db.ReadGraph;
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18 import org.simantics.db.common.request.TernaryRead;
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19 import org.simantics.db.exception.DatabaseException;
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20 import org.simantics.db.layer0.variable.Variable;
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21 import org.simantics.utils.ui.ErrorLogger;
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23 final public class MonitorValue extends TernaryRead<String, Formatter, Variable, String> {
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25 public MonitorValue(String expression, Formatter formatter, Variable variable) {
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26 super(expression, formatter, variable);
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30 public String perform(ReadGraph graph) throws DatabaseException {
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31 if (parameter == null)
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34 MonitorExpressionVisitor visitor = new MonitorExpressionVisitor(graph, parameter2, parameter3);
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36 Expressions.evaluate(parameter, visitor);
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37 Object result = visitor.getResult();
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38 if (result instanceof Throwable)
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39 return ((Throwable) result).getLocalizedMessage();
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40 return result != null ? result.toString() : "null";
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41 } catch (ExpressionException e) {
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42 ErrorLogger.defaultLogError(e);
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43 return e.getMessage();
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