oracle.toplink.essentials.internal.parsing.PlusNode Maven / Gradle / Ivy
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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;
}
}