| /* |
| * Copyright (c) 2006, 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: |
| // Oracle - initial API and implementation |
| // |
| package org.eclipse.persistence.jpa.jpql.parser; |
| |
| import org.eclipse.persistence.jpa.jpql.WordParser; |
| |
| /** |
| * <p> |
| * The <b>AND</b> logical operator chains multiple criteria together. A valid operand of an |
| * <b>AND</b> operator must be one of: <b>TRUE</b>, <b>FALSE</b>, and <b>NULL</b>. The |
| * <b>AND</b> operator has a higher precedence than the <b>OR</b> operator. |
| * </p><p> |
| * <b>NULL</b> represents unknown. Therefore, if one operand is <b>NULL</b> and the other operand |
| * is <b>FALSE</b> the result is <b>FALSE</b>, because one <b>FALSE</b> operand is sufficient for |
| * a <b>FALSE</b> result. If one operand is <b>NULL</b> and the other operand is either |
| * <b>TRUE</b> or <b>NULL</b>, the result is <b>NULL</b> (unknown). |
| * </p> |
| * |
| * <table border="1" style="border:1px outset darkgrey;"> |
| * <caption>The following table shows how the <code><b>AND</b></code> operator is evaluated based on its two operands:</caption> |
| * <tr><td></td> <td><b>TRUE</b></td><td><b>FALSE</b></td><td><b>NULL</b></td></tr> |
| * <tr><td><b>TRUE</b> </td><td> TRUE </td><td> FALSE </td><td> NULL </td></tr> |
| * <tr><td><b>FALSE</b></td><td> FALSE </td><td> FALSE </td><td> FALSE </td></tr> |
| * <tr><td><b>NULL</b> </td><td> NULL </td><td> FALSE </td><td> NULL </td></tr> |
| * </table> |
| * |
| * <div><b>BNF:</b> <code>conditional_term ::= conditional_term AND conditional_factor</code></div> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class AndExpression extends LogicalExpression { |
| |
| /** |
| * Creates a new <code>AndExpression</code>. |
| * |
| * @param parent The parent of this expression |
| */ |
| public AndExpression(AbstractExpression parent) { |
| super(parent, AND); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String getLeftExpressionQueryBNFId() { |
| return ConditionalTermBNF.ID; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public String getRightExpressionQueryBNFId() { |
| return ConditionalFactorBNF.ID; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) { |
| return word.equalsIgnoreCase(AND) || |
| word.equalsIgnoreCase(OR) || |
| super.isParsingComplete(wordParser, word, expression); |
| } |
| } |