Ramp.java

/* An adapter class for ptolemy.actor.lib.Ramp.

 Copyright (c) 2006-2009 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
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 software and its documentation for any purpose, provided that the above
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 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
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 */
package ptolemy.data.properties.lattice.logicalAND.actor.lib;

import java.util.List;

import ptolemy.data.IntToken;
import ptolemy.data.properties.lattice.PropertyConstraintSolver;
import ptolemy.kernel.util.Attribute;
import ptolemy.kernel.util.IllegalActionException;

//////////////////////////////////////////////////////////////////////////
//// Ramp

/**
 An adapter class for ptolemy.actor.lib.Ramp.

 @author Thomas Mandl
@version $Id$
@since Ptolemy II 7.1
*/
public class Ramp extends Source {

    /**
     */
    public Ramp(PropertyConstraintSolver solver, ptolemy.actor.lib.Ramp actor)
            throws IllegalActionException {

        super(solver, actor);
        _actor = actor;
    }

    public List<Inequality> constraintList() throws IllegalActionException {
        if (_actor.step.getPort().connectedPortList().isEmpty()) {
            setAtLeast(_actor.output, _actor.step);
            if (_actor.step.getToken().isEqualTo(new IntToken(0))
                    .booleanValue()) {
                setAtLeast(_actor.output, _lattice.getElement("TRUE"));
            } else {
                setAtLeast(_actor.output, _lattice.getElement("FALSE"));
            }
        } else {
            // since we do not have partial evaluation we have to set
            // the property to a conservative solution
            setAtLeast(_actor.output, _lattice.getElement("FALSE"));
        }

        return super.constraintList();
    }

    protected List<Attribute> _getPropertyableAttributes() {
        List<Attribute> result = super._getPropertyableAttributes();
        if (_actor.step.getPort().connectedPortList().isEmpty()) {
            result.add(_actor.step);
        }

        return result;
    }

    ///////////////////////////////////////////////////////////////////
    ////                         private variables                 ////
    private ptolemy.actor.lib.Ramp _actor;

}