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.expressions.*;
040:
041: /**
042: * INTERNAL
043: * <p><b>Purpose</b>: Represent a LIKE in EJBQL
044: * <p><b>Responsibilities</b>:<ul>
045: * <li> Generate the correct expression for a LIKE
046: * </ul>
047: * @author Jon Driscoll and Joel Lucuik
048: * @since TopLink 4.0
049: */
050: public class LikeNode extends SimpleConditionalExpressionNode {
051: private EscapeNode escape = null;
052:
053: /**
054: * LikeNode constructor comment.
055: */
056: public LikeNode() {
057: super ();
058: }
059:
060: /**
061: * INTERNAL
062: * Validate the current node and calculates its type.
063: */
064: public void validate(ParseTreeContext context) {
065: TypeHelper typeHelper = context.getTypeHelper();
066: if (left != null) {
067: left.validate(context);
068: left.validateParameter(context, typeHelper.getStringType());
069: }
070: if (right != null) {
071: right.validate(context);
072: right
073: .validateParameter(context, typeHelper
074: .getStringType());
075: }
076:
077: if (escape != null) {
078: escape.validate(context);
079: }
080:
081: setType(typeHelper.getBooleanType());
082: }
083:
084: /**
085: * INTERNAL
086: * Return a TopLink expression for this node.
087: */
088: public Expression generateExpression(GenerationContext context) {
089: Expression whereClause = getLeft().generateExpression(context);
090: if (!hasEscape()) {
091: whereClause = whereClause.like(getRight()
092: .generateExpression(context));
093: } else {
094: whereClause = whereClause.like(getRight()
095: .generateExpression(context), getEscapeNode()
096: .generateExpression(context));
097: }
098: return whereClause;
099: }
100:
101: public boolean hasEscape() {
102: return getEscapeNode() != null;
103: }
104:
105: // Accessors
106: public EscapeNode getEscapeNode() {
107: return escape;
108: }
109:
110: public void setEscapeNode(EscapeNode node) {
111: escape = node;
112: }
113: }
|