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package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;

/**
 * INTERNAL
 * <p><b>Purpose</b>: Represent an ABS in EJBQL
 * <p><b>Responsibilities</b>:<ul>
 * <li> Generate the correct expression for an ABS in EJBQL
 * </ul>
 *    @author Jon Driscoll and Joel Lucuik
 *    @since TopLink 4.0
 */
public class AbsNode extends ArithmeticFunctionNode {
    public AbsNode() {
        super();
    }

    /**
     * INTERNAL
     * Validate node and calculate its type.
     */
    public void validate(ParseTreeContext context) {
        if (left != null) {
            left.validate(context);
            setType(left.getType());
        }
    }

    /**
     * INTERNAL 
     */
    public void validateParameter(ParseTreeContext context, Object contextType) {
        // delegate to the argument node
        left.validateParameter(context, contextType);
    }

    /**
     * INTERNAL
     * Generate the TopLink expression for this node
     */
    public Expression generateExpression(GenerationContext context) {
        Expression whereClause = getLeft().generateExpression(context);
        whereClause = ExpressionMath.abs(whereClause);
        return whereClause;
    }

}