1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.modeling.ui.diagram.monitor;
14 import org.simantics.basicexpression.Expressions;
15 import org.simantics.basicexpression.analysis.ExpressionException;
16 import org.simantics.common.format.Formatter;
17 import org.simantics.db.ReadGraph;
18 import org.simantics.db.common.request.TernaryRead;
19 import org.simantics.db.exception.DatabaseException;
20 import org.simantics.db.layer0.variable.Variable;
21 import org.simantics.utils.ui.ErrorLogger;
23 final public class MonitorValue extends TernaryRead<String, Formatter, Variable, String> {
25 public MonitorValue(String expression, Formatter formatter, Variable variable) {
26 super(expression, formatter, variable);
30 public String perform(ReadGraph graph) throws DatabaseException {
31 if (parameter == null)
34 MonitorExpressionVisitor visitor = new MonitorExpressionVisitor(graph, parameter2, parameter3);
36 Expressions.evaluate(parameter, visitor);
37 Object result = visitor.getResult();
38 if (result instanceof Throwable)
39 return ((Throwable) result).getLocalizedMessage();
40 return result != null ? result.toString() : "null"; //$NON-NLS-1$
41 } catch (ExpressionException e) {
42 ErrorLogger.defaultLogError(e);
43 return e.getMessage();