oracle.toplink.essentials.internal.parsing.SizeNode Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
import oracle.toplink.essentials.exceptions.EJBQLException;
/**
* INTERNAL
* Purpose: Represent a SIZE function
*
Responsibilities:
* - Generate the correct expression for SIZE
*
*/
public class SizeNode extends ArithmeticFunctionNode {
/**
* Return a new SizeNode.
*/
public SizeNode() {
super();
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
if (left != null) {
left.validate(context);
}
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getIntType());
}
/**
* INTERNAL
* Generate the TopLink expression for this node
*/
public Expression generateExpression(GenerationContext context) {
DotNode dotNode = (DotNode)getLeft();
Node prefix = dotNode.getLeft();
String variableName = ((AttributeNode)dotNode.getRight()).getAttributeName();
// check whether variable denotes a collection valued field
if (!dotNode.endsWithCollectionField(context)) {
throw EJBQLException.invalidSizeArgument(
context.getParseTreeContext().getQueryInfo(),
getLine(), getColumn(), variableName);
}
Expression whereClause = prefix.generateExpression(context);
whereClause = whereClause.size(variableName);
return whereClause;
}
}