org.eclipse.persistence.internal.jpa.parsing.DateFunctionNode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation

EclipseLink build based upon Git transaction f2b9fc5

There is a newer version: 5.0.0-B03

/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// 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
 * Purpose: Represent a date function: CURRENT_DATE, CURRENT_TIME,
 * CURRENT_TIMESTAMP.
 * 
Responsibilities:

 *  Generate the correct expression for the date function
 * 
 */
public class DateFunctionNode extends FunctionalExpressionNode {

    private Class type;

    /**
     * DateFunctionNode constructor.
     */
    public DateFunctionNode() {
        super();
    }

    /**
     * INTERNAL
     * Apply this node to the passed query
     */
    @Override
    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.
     */
    @Override
    public void validate(ParseTreeContext context) {
        setType(type);
    }

    /**
     * INTERNAL
     * Generate the EclipseLink expression for this node
     */
    @Override
    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;
    }

}