Ptidej-v5.2-master/POM Tests/data/ArgoUML_0.28/src/org/argouml/profile/internal/ocl/EvaluateInvariant.java
// $Id: EvaluateInvariant.java 15924 2008-10-14 19:28:49Z tfmorris $
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package org.argouml.profile.internal.ocl;

import tudresden.ocl.parser.analysis.DepthFirstAdapter;
import tudresden.ocl.parser.node.AConstraint;
import tudresden.ocl.parser.node.PConstraintBody;

/**
 * Evaluates OCL invariants, this class should not depend on the model
 * subsystem.
 * 
 * @author maurelio1234
 */
public class EvaluateInvariant extends DepthFirstAdapter {

    /**
     * Is this invariant satified?
     */
    private boolean ok = true;

    /**
     * The Expression Evaluator
     */
    private EvaluateExpression expEvaluator = null;

    private Object modelElement;

    private ModelInterpreter mi;

    /**
     * Constructor
     * 
     * @param element self
     * @param interpreter model interpreter
     */
    public EvaluateInvariant(Object element, ModelInterpreter interpreter) {
        this.modelElement = element;
        this.mi = interpreter;
        this.expEvaluator = new EvaluateExpression(element, interpreter);
    }

    /**
     * @return is the invariant ok?
     */
    public boolean isOK() {
        return ok;
    }

    /** Interpreter Code * */

    /*
     * @see tudresden.ocl.parser.analysis.DepthFirstAdapter#caseAConstraint(tudresden.ocl.parser.node.AConstraint)
     */
    @Override
    public void caseAConstraint(AConstraint node) {
        inAConstraint(node);
        if (node.getContextDeclaration() != null) {
            node.getContextDeclaration().apply(this);
        }
        {
            boolean localOk = true;

            Object temp[] = node.getConstraintBody().toArray();
            for (int i = 0; i < temp.length; i++) {
                expEvaluator.reset(modelElement, mi);
                ((PConstraintBody) temp[i]).apply(expEvaluator);

                Object val = expEvaluator.getValue();
                localOk &= val != null && (val instanceof Boolean)
                        && (Boolean) val;
            }

            ok = localOk;
        }
        outAConstraint(node);
    }

}
