/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.equation.ext;

import org.simantics.db.Resource;
import org.simantics.db.ReadGraph;
import org.simantics.db.exception.DatabaseException;
import org.simantics.equation.EquationResources;
import org.simantics.equation.solver.ExpressionSolver;
import org.simantics.equation.solver.Solver;
import org.simantics.equation.stubs.EquationResource;

public class SecondOrderScalarPolynomialSolver implements ExpressionSolver {

    public void evaluate(Solver solver, ReadGraph g, Resource t) throws DatabaseException {
        EquationResource eq = EquationResources.equationResource;

        double a = g.getRelatedValue(t, eq.HasA);
        double b = g.getRelatedValue(t, eq.HasB);
        double c = g.getRelatedValue(t, eq.HasC);

        double x = solver.getDoubleValue(g, g.getSingleObject(t, eq.HasSource));

        double r = a * x * x + b * x + c;

        solver.setValue(g.getSingleObject(t, eq.HasTarget), new double[] { r });
    }

}