| /* |
| * Copyright (c) 2011, 2021 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: |
| // Gordon Yorke - Initial development |
| // |
| package org.eclipse.persistence.internal.jpa.querydef; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import jakarta.persistence.criteria.Expression; |
| import jakarta.persistence.criteria.Predicate; |
| import jakarta.persistence.metamodel.Metamodel; |
| |
| /** |
| * <p> |
| * <b>Purpose</b>: Contains the implementation of the Predicate interface of the JPA |
| * criteria API. |
| * <p> |
| * <b>Description</b>: The predicate forms the least specific expression node. Predicates |
| * result in boolean expressions that are combined to form the final expression. |
| * |
| * @see jakarta.persistence.criteria Predicate |
| * |
| * @author gyorke |
| * @since EclipseLink 1.2 |
| */ |
| public class PredicateImpl extends CompoundExpressionImpl implements Predicate { |
| |
| protected BooleanOperator booloperator; |
| |
| public <T> PredicateImpl (Metamodel metamodel, org.eclipse.persistence.expressions.Expression expressionNode, List<Expression<?>> parentExpressions, BooleanOperator operator){ |
| super(metamodel, expressionNode, parentExpressions); |
| this.booloperator = operator; |
| } |
| |
| /** |
| * INTERNAL: |
| * This method returns null if this is not a conjunction/disjunction |
| * TRUE if this is a conjunction, FALSE for disjunction. |
| */ |
| public Boolean getJunctionValue() { |
| if (this.currentNode != null) { |
| return null; |
| } |
| return this.getOperator() == BooleanOperator.AND; |
| } |
| |
| @Override |
| /** |
| * Return the boolean operator for the predicate. If the predicate is |
| * simple, this is AND. |
| * |
| * @return boolean operator for the predicate |
| */ |
| public BooleanOperator getOperator(){ |
| return this.booloperator; |
| } |
| |
| /** |
| * Return the top-level conjuncts or disjuncts of the predicate. |
| * |
| * @return list boolean expressions forming the predicate |
| */ |
| @Override |
| public List<Expression<Boolean>> getExpressions(){ |
| return this.expressions; |
| } |
| |
| /** |
| * Apply negation to the predicate. |
| * |
| * @return the negated predicate |
| */ |
| @Override |
| public Predicate not(){ |
| PredicateImpl predicateImpl = null; |
| if (isJunction()) { |
| if (getJunctionValue()) { |
| predicateImpl = new PredicateImpl(this.metamodel, null, null, BooleanOperator.OR); |
| } else { |
| predicateImpl = new PredicateImpl(this.metamodel, null, null, BooleanOperator.AND); |
| } |
| predicateImpl.setIsNegated(true); |
| return predicateImpl; |
| } |
| List<Expression<?>> list = new ArrayList(); |
| list.add(this); |
| predicateImpl = new PredicateImpl(this.metamodel, this.currentNode.not(), list, this.booloperator); |
| predicateImpl.setIsNegated(true); |
| return predicateImpl; |
| } |
| |
| /** |
| * @param operator the operator to set |
| */ |
| @Override |
| public void setOperator(BooleanOperator operator) { |
| this.booloperator = operator; |
| } |
| |
| @Override |
| public boolean isJunction(){ |
| return this.currentNode == null; |
| } |
| |
| @Override |
| public boolean isCompoundExpression(){ |
| return false; |
| } |
| } |