org.eclipse.persistence.internal.jpa.parsing.LessThanNode Maven / Gradle / Ivy
/*
* Copyright (c) 1998, 2019 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 org.eclipse.persistence.expressions.Expression;
/**
* 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.
*/
@Override
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
*/
@Override
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.
*/
@Override
public String getAsString() {
return left.getAsString() + " < " + right.getAsString();
}
}