/*******************************************************************************
* Copyright (c) 1998, 2010 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.jpa.parsing;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.queries.ReportQuery;
import org.eclipse.persistence.expressions.*;
/**
* INTERNAL
* <p><b>Purpose</b>: Represent a date function: CURRENT_DATE, CURRENT_TIME,
* CURRENT_TIMESTAMP.
* <p><b>Responsibilities</b>:<ul>
* <li> Generate the correct expression for the date function
* </ul>
*/
public class DateFunctionNode extends FunctionalExpressionNode {
private Class type;
/**
* DateFunctionNode constructor.
*/
public DateFunctionNode() {
super();
}
/**
* INTERNAL
* Apply this node to the passed query
*/
public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
if (theQuery.isReportQuery()){
ReportQuery reportQuery = (ReportQuery)theQuery;
reportQuery.addAttribute("date", generateExpression(context), type);
}
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
setType(type);
}
/**
* INTERNAL
* Generate the EclipseLink expression for this node
*/
public Expression generateExpression(GenerationContext context) {
Expression expr = context.getBaseExpression();
if (expr == null) {
expr = new ExpressionBuilder();
}
Expression result = null;
if (type == Date.class) {
result = expr.currentDateDate();
} else if (type == Time.class) {
result = expr.currentTime();
} else if (type == Timestamp.class) {
result = expr.currentDate();
}
return result;
}
/** */
public void useCurrentDate() {
type = Date.class;
}
/** */
public void useCurrentTime() {
type = Time.class;
}
/** */
public void useCurrentTimestamp() {
type = Timestamp.class;
}
}