oracle.toplink.essentials.internal.parsing.MinNode Maven / Gradle / Ivy
/*
* 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, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
import oracle.toplink.essentials.queryframework.ReportQuery;
import oracle.toplink.essentials.expressions.Expression;
/**
* INTERNAL
* Purpose: Model a MIN
*
Responsibilities:
* - Apply itself to a query correctly
*
*/
public class MinNode extends AggregateNode {
/**
* INTERNAL
* Apply this node to the passed query
*/
public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
if (theQuery.isReportQuery()) {
ReportQuery reportQuery = (ReportQuery)theQuery;
reportQuery.addAttribute(resolveAttribute(),
generateExpression(context));
}
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
if (left != null) {
left.validate(context);
setType(left.getType());
}
}
/**
* INTERNAL
*/
protected Expression addAggregateExression(Expression expr) {
return expr.minimum();
}
/**
* INTERNAL
* Get the string representation of this node.
*/
public String getAsString() {
return "MIN(" + left.getAsString() + ")";
}
}