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/*
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 * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
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 *
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 * 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
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package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;

/**
 * INTERNAL
 * Purpose: Represent a SQRT
 * 
Responsibilities:

 *  Generate the correct expression for SQRT
 * 
 *    @author Jon Driscoll and Joel Lucuik
 *    @since TopLink 4.0
 */
public class SqrtNode extends ArithmeticFunctionNode {

    /**
     * Return a new SqrtNode
     */
    public SqrtNode() {
        super();
    }

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

    /**
     * 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 = whereClause.getFunction(ExpressionOperator.Sqrt);
        return whereClause;
    }

}