001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
005: *
006: *
007: * The contents of this file are subject to the terms of either the GNU
008: * General Public License Version 2 only ("GPL") or the Common Development
009: * and Distribution License("CDDL") (collectively, the "License"). You
010: * may not use this file except in compliance with the License. You can obtain
011: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
012: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
013: * language governing permissions and limitations under the License.
014: *
015: * When distributing the software, include this License Header Notice in each
016: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
017: * Sun designates this particular file as subject to the "Classpath" exception
018: * as provided by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the License
020: * Header, with the fields enclosed by brackets [] replaced by your own
021: * identifying information: "Portions Copyrighted [year]
022: * [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * If you wish your version of this file to be governed by only the CDDL or
027: * only the GPL Version 2, indicate your decision by adding "[Contributor]
028: * elects to include this software in this distribution under the [CDDL or GPL
029: * Version 2] license." If you don't indicate a single choice of license, a
030: * recipient has the option to distribute your version of this file under
031: * either the CDDL, the GPL Version 2 or to extend the choice of license to
032: * its licensees as provided above. However, if you add GPL Version 2 code
033: * and therefore, elected the GPL Version 2 license, then the option applies
034: * only if the new code is made subject to such option by the copyright
035: * holder.
036: */
037: package oracle.toplink.essentials.internal.parsing;
038:
039: import java.sql.Date;
040: import java.sql.Time;
041: import java.sql.Timestamp;
042:
043: import oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
044: import oracle.toplink.essentials.queryframework.ReportQuery;
045: import oracle.toplink.essentials.expressions.*;
046:
047: /**
048: * INTERNAL
049: * <p><b>Purpose</b>: Represent a date function: CURRENT_DATE, CURRENT_TIME,
050: * CURRENT_TIMESTAMP.
051: * <p><b>Responsibilities</b>:<ul>
052: * <li> Generate the correct expression for the date function
053: * </ul>
054: */
055: public class DateFunctionNode extends FunctionalExpressionNode {
056:
057: private Class type;
058:
059: /**
060: * DateFunctionNode constructor.
061: */
062: public DateFunctionNode() {
063: super ();
064: }
065:
066: /**
067: * INTERNAL
068: * Apply this node to the passed query
069: */
070: public void applyToQuery(ObjectLevelReadQuery theQuery,
071: GenerationContext context) {
072: if (theQuery.isReportQuery()) {
073: ReportQuery reportQuery = (ReportQuery) theQuery;
074: reportQuery.addAttribute("date",
075: generateExpression(context), type);
076: }
077: }
078:
079: /**
080: * INTERNAL
081: * Validate node and calculate its type.
082: */
083: public void validate(ParseTreeContext context) {
084: setType(type);
085: }
086:
087: /**
088: * INTERNAL
089: * Generate the TopLink expression for this node
090: */
091: public Expression generateExpression(GenerationContext context) {
092: Expression expr = context.getBaseExpression();
093: if (expr == null) {
094: expr = new ExpressionBuilder();
095: }
096: Expression result = null;
097: if (type == Date.class) {
098: result = expr.currentDateDate();
099: } else if (type == Time.class) {
100: result = expr.currentTime();
101: } else if (type == Timestamp.class) {
102: result = expr.currentDate();
103: }
104: return result;
105: }
106:
107: /** */
108: public void useCurrentDate() {
109: type = Date.class;
110: }
111:
112: /** */
113: public void useCurrentTime() {
114: type = Time.class;
115: }
116:
117: /** */
118: public void useCurrentTimestamp() {
119: type = Timestamp.class;
120: }
121:
122: }
|