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package uk.org.retep.math.model;

import uk.org.retep.math.MathematicsException;
import uk.org.retep.math.visitor.ArithmeticVisitor;

/**
 * A monadic Function. Here when accepting a visitor, if it's an instance of {@link FunctionArithmeticVisitor}
 * then {@link #acceptImpl(uk.org.retep.math.visitor.FunctionArithmeticVisitor) } is called, otherwise
 * we simply accept against the child. Doing this allows us to still optimise etc the parameter, but the function
 * will never be optimised.
 *
 */
public abstract class MonadicFunctionOp
        extends MonadicOp
{

    @Override
    public final Object accept( ArithmeticVisitor visitor )
            throws MathematicsException
    {
        if( getVisitor().isAssignableFrom( visitor.getClass() ) )
        {
            return acceptImpl( getVisitor().cast( visitor ) );
        }
        else if( getValue() != null )
        {
            return getValue().accept( visitor );
        }
        else
        {
            return null;
        }
    }

    protected abstract Class getVisitor();

    protected abstract Object acceptImpl( V visitor )
            throws MathematicsException;
}