Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/uml/ui/behavior/state_machines/UMLChangeExpressionModel.java
// $Id: UMLChangeExpressionModel.java 15003 2008-06-19 17:00:09Z mvw $
// Copyright (c) 2006-2008 The Regents of the University of California. All
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// software and its documentation without fee, and without a written
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package org.argouml.uml.ui.behavior.state_machines;

import org.apache.log4j.Logger;
import org.argouml.model.Model;
import org.argouml.ui.targetmanager.TargetManager;
import org.argouml.uml.ui.UMLExpressionModel2;
import org.argouml.uml.ui.UMLUserInterfaceContainer;

/**
 * The model for the boolean expression of a ChangeEvent.
 * 
 * @author michiel
 */
class UMLChangeExpressionModel extends UMLExpressionModel2 {

    private static final Logger LOG =
        Logger.getLogger(UMLChangeExpressionModel.class);

    /**
     * The constructor.
     *
     * @param container the container of UML user interface components
     * @param propertyName the name of the property
     */
    public UMLChangeExpressionModel(UMLUserInterfaceContainer container,
            String propertyName) {
        super(container, propertyName);
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#getExpression()
     */
    public Object getExpression() {
        return Model.getFacade().getChangeExpression(
                TargetManager.getInstance().getTarget());
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#setExpression(java.lang.Object)
     */
    public void setExpression(Object expression) {
        Object target = TargetManager.getInstance().getTarget();

        if (target == null) {
            throw new IllegalStateException("There is no target for "
                    + getContainer());
        }
        Model.getStateMachinesHelper().setChangeExpression(target, expression);
    }

    /*
     * @see org.argouml.uml.ui.UMLExpressionModel2#newExpression()
     */
    public Object newExpression() {
        LOG.debug("new boolean expression");
        return Model.getDataTypesFactory().createBooleanExpression("", "");
    }

}
