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package oracle.toplink.essentials.internal.parsing;

import oracle.toplink.essentials.expressions.*;

/**
 * INTERNAL
 * 

Purpose: Represent a '+' in EJBQL *

Responsibilities:

    *
  • Generate the correct expression for a '+' *
* @author Jon Driscoll and Joel Lucuik * @since July 2003 */ public class PlusNode extends BinaryOperatorNode { public PlusNode() { super(); } /** * INTERNAL * Validate node and calculates its type. */ public void validate(ParseTreeContext context) { super.validate(context); if ((left != null) && (right != null)) { TypeHelper typeHelper = context.getTypeHelper(); setType(typeHelper.extendedBinaryNumericPromotion( left.getType(), right.getType())); } } /** * INTERNAL * Generate the expression. The steps are: * 1. Generate the expression for the left node * 2. Add the .plus to the where clause returned from step 1 * 3. Generate the expression for the right side and use it as the parameter for the .plus() * 4. Return the completed where clause to the caller */ public Expression generateExpression(GenerationContext context) { Expression whereClause = getLeft().generateExpression(context); whereClause = ExpressionMath.add(whereClause, getRight().generateExpression(context)); return whereClause; } public boolean isPlusNode() { return true; } }




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