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package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.Expression;
/**
* INTERNAL
* <p><b>Purpose</b>: Represent a WHERE
* <p><b>Responsibilities</b>:<ul>
* <li> Apply this where clause to a query
* </ul>
* @author Jon Driscoll
* @since TopLink 5.0
*/
public class WhereNode extends MajorNode {
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
if (left != null) {
left.validate(context);
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getBooleanType());
}
}
/**
* INTERNAL
* @param context The generation context
* @return A TopLink expression
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = null;
if (getLeft() != null) {
whereClause = getLeft().generateExpression(context);
}
return whereClause;
}
}