| /* |
| * 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; |
| |
| /** |
| * This expression represents an arithmetic expression, which means the first and second expressions |
| * are aggregated with an arithmetic sign. |
| * |
| * @see AdditionExpression |
| * @see DivisionExpression |
| * @see MultiplicationExpression |
| * @see SubtractionExpression |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public abstract class ArithmeticExpression extends CompoundExpression { |
| |
| /** |
| * Creates a new <code>ArithmeticExpression</code>. |
| * |
| * @param parent The parent of this expression |
| * @param identifier The arithmetic sign |
| */ |
| protected ArithmeticExpression(AbstractExpression parent, String identifier) { |
| super(parent, identifier); |
| } |
| |
| @Override |
| public JPQLQueryBNF findQueryBNF(Expression expression) { |
| return getParent().findQueryBNF(expression); |
| } |
| |
| /** |
| * Returns the arithmetic sign this expression is actually representing. |
| * |
| * @return The single character value of the arithmetic sign |
| */ |
| public final String getArithmeticSign() { |
| return getText(); |
| } |
| |
| @Override |
| public String getLeftExpressionQueryBNFId() { |
| return ArithmeticExpressionBNF.ID; |
| } |
| |
| @Override |
| public final JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(ArithmeticTermBNF.ID); |
| } |
| |
| @Override |
| public final String getRightExpressionQueryBNFId() { |
| return ArithmeticTermBNF.ID; |
| } |
| |
| @Override |
| protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) { |
| |
| char character = word.charAt(0); |
| |
| // A comparison symbol needs to continue the parsing |
| if (character == '=' || character == '<' || character == '>') { |
| return true; |
| } |
| |
| // Addition/Subtraction will create a chain of operations |
| if (character == '+' || character == '-') { |
| return false; |
| } |
| |
| // Multiplication/Division will group the expression together to follow the order of operation |
| if (character == '*' || character == '/') { |
| return (expression == null); |
| } |
| |
| return (expression != null); |
| } |
| |
| @Override |
| protected final String parseIdentifier(WordParser wordParser) { |
| return getText(); |
| } |
| } |