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/**
 * INTERNAL
 * <p><b>Purpose</b>: This node represents a HAVING
 * <p><b>Responsibilities</b>:<ul>
 * <li> Generate the correct expression for HAVING
 * </ul>
 */
package oracle.toplink.essentials.internal.parsing;

// TopLink Imports
import oracle.toplink.essentials.queryframework.ReportQuery;
import oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
import oracle.toplink.essentials.exceptions.EJBQLException;
import oracle.toplink.essentials.expressions.Expression;

public class HavingNode extends MajorNode {

    private Node having = null;

    /**
     * INTERNAL
     * Validate the current node.
     */
    public void validate(ParseTreeContext context, GroupByNode groupbyNode) {
        if (having != null) {
            having.validate(context);
            
            if ((groupbyNode != null) && !groupbyNode.isValidHavingExpr(having)) {
                throw EJBQLException.invalidHavingExpression(
                    context.getQueryInfo(),  having.getLine(), having.getColumn(),
                    having.getAsString(), groupbyNode.getAsString());
            }
        }
    }
    
    /**
     * INTERNAL
     * Add the having expression to the passed query
     */
    public void addHavingToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            Expression havingExpression = getHaving().generateExpression(context);
            ((ReportQuery)theQuery).setHavingExpression(havingExpression);
        }
    }

    /**
     * INTERNAL
     * Return the HAVING expression
     */
    public Node getHaving() {
        return having;
    }

    /**
     * INTERNAL
     * Set the HAVING expression
     */
    public void setHaving(Node having) {
        this.having = having;
    }
}