oracle.toplink.essentials.internal.parsing.OrNode Maven / Gradle / Ivy
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* 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
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// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.parsing;
import java.util.*;
import oracle.toplink.essentials.expressions.*;
/**
* INTERNAL
* Purpose: Represent an OR
*
Responsibilities:
* - Generate the correct expression for an OR
*
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class OrNode extends LogicalOperatorNode {
private Set leftOuterScopeVariables = null;
private Set rightOuterScopeVariables = null;
/**
* Return a new OrNode.
*/
public OrNode() {
super();
}
/**
* INTERNAL
* Validate node and calculate its type.
*/
public void validate(ParseTreeContext context) {
Set saved = context.getOuterScopeVariables();
if (left != null) {
context.resetOuterScopeVariables();
left.validate(context);
leftOuterScopeVariables = context.getOuterScopeVariables();
}
if (right != null) {
context.resetOuterScopeVariables();
right.validate(context);
rightOuterScopeVariables = context.getOuterScopeVariables();
}
context.resetOuterScopeVariables(saved);
if ((left != null) && (right != null)) {
left.validateParameter(context, right.getType());
right.validateParameter(context, left.getType());
}
TypeHelper typeHelper = context.getTypeHelper();
setType(typeHelper.getBooleanType());
}
/**
* INTERNAL
* Return a TopLink expression by 'OR'ing the expressions from the left and right nodes
*/
public Expression generateExpression(GenerationContext context) {
// Get the left expression
Expression leftExpr = getLeft().generateExpression(context);
leftExpr = appendOuterScopeVariableJoins(
leftExpr, leftOuterScopeVariables, context);
Expression rightExpr = getRight().generateExpression(context);
rightExpr = appendOuterScopeVariableJoins(
rightExpr, rightOuterScopeVariables, context);
// Or it with whatever the right expression is
return leftExpr.or(rightExpr);
}
/**
* INTERNAL
*/
private Expression appendOuterScopeVariableJoins(
Expression expr, Set outerScopeVariables, GenerationContext context) {
if ((outerScopeVariables == null) || outerScopeVariables.isEmpty()) {
// no outer scope variables => nothing to be done
return expr;
}
Expression joins = context.joinVariables(outerScopeVariables);
return appendExpression(expr, joins);
}
}