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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
 * 
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * 
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 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;

/**
 * INTERNAL
 * Purpose: Represent an ABS in EJBQL
 * 
Responsibilities:

 *  Generate the correct expression for an ABS in EJBQL
 * 
 *    @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;
    }

}