oracle.toplink.essentials.internal.parsing.LessThanNode Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*/
// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.parsing;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL
* Purpose: Represent a '<' in EJBQL
*
Responsibilities:
* - Generate the correct expression for a '<'
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class LessThanNode extends BinaryOperatorNode {
/**
* LessThanNode constructor comment.
*/
public LessThanNode() {
super();
}
/**
* INTERNAL
* Validate the current node and calculates its type.
*/
public void validate(ParseTreeContext context) {
super.validate(context);
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getBooleanType());
}
/**
* INTERNAL
* Resolve the expression. The steps are:
* 1. Set the expressionBuilder for the left and right nodes
* 2. Generate the expression for the left node
* 3. Add the .lessThan to the where clause returned from step 2
* 4. Generate the expression for the right side and use it as the parameter for the .lessThan()
* 5. Return the completed where clause to the caller
*/
public Expression generateExpression(GenerationContext context) {
Expression whereClause = getLeft().generateExpression(context);
whereClause = whereClause.lessThan(getRight().generateExpression(context));
return whereClause;
}
/**
* INTERNAL
* Get the string representation of this node.
*/
public String getAsString() {
return left.getAsString() + " < " + right.getAsString();
}
}