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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
// Copyright (c) 1998, 2006, Oracle. All rights reserved.  

/**
 * INTERNAL
 * Purpose: This node represents a HAVING
 * 
Responsibilities:

 *  Generate the correct expression for HAVING
 * 
 */
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(
                    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;
    }
}