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 oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
040: import oracle.toplink.essentials.queryframework.ReportQuery;
041: import oracle.toplink.essentials.expressions.Expression;
042:
043: /**
044: * INTERNAL
045: * <p><b>Purpose</b>: Model a COUNT
046: * <p><b>Responsibilities</b>:<ul>
047: * <li> Apply itself to a query correctly
048: * </ul>
049: * @author Jon Driscoll
050: * @since TopLink 5.0
051: */
052: public class CountNode extends AggregateNode {
053:
054: /**
055: * INTERNAL
056: * Apply this node to the passed query
057: */
058: public void applyToQuery(ObjectLevelReadQuery theQuery,
059: GenerationContext context) {
060: if (theQuery.isReportQuery()) {
061: ReportQuery reportQuery = (ReportQuery) theQuery;
062: String attrName = getLeft().isDotNode() ? resolveAttribute()
063: : "COUNT";
064: reportQuery.addAttribute(attrName,
065: generateExpression(context), Long.class);
066: }
067: }
068:
069: /**
070: * INTERNAL
071: * Validate node and calculate its type.
072: */
073: public void validate(ParseTreeContext context) {
074: if (left != null) {
075: left.validate(context);
076: TypeHelper typeHelper = context.getTypeHelper();
077: setType(typeHelper.getLongClassType());
078: }
079: }
080:
081: /**
082: * INTERNAL
083: */
084: protected Expression addAggregateExression(Expression expr) {
085: return expr.count();
086: }
087:
088: /**
089: * INTERNAL
090: * Is this node a CountNode
091: */
092: public boolean isCountNode() {
093: return true;
094: }
095:
096: /**
097: * INTERNAL
098: * Get the string representation of this node.
099: */
100: public String getAsString() {
101: return "COUNT(" + left.getAsString() + ")";
102: }
103: }
|