| /* |
| * 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 java.util.Collection; |
| import java.util.List; |
| import org.eclipse.persistence.jpa.jpql.WordParser; |
| |
| /** |
| * This expression simply adds a plus or minus sign to the arithmetic primary expression. |
| * |
| * <div><b>BNF:</b> <code>arithmetic_factor ::= [{+|-}] arithmetic_primary</code></div> |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public final class ArithmeticFactor extends AbstractExpression { |
| |
| /** |
| * The {@link Expression} representing the arithmetic primary. |
| */ |
| private AbstractExpression expression; |
| |
| /** |
| * Determines whether there is a whitespace after the arithmetic operator. |
| */ |
| private boolean hasSpaceAfterArithmeticOperator; |
| |
| /** |
| * The arithmetic operator, either '+' or '-'. |
| */ |
| private char operator; |
| |
| /** |
| * Creates a new <code>ArithmeticFactor</code>. |
| * |
| * @param parent The parent of this expression |
| * @param arithmeticFactor The arithmetic factor, which is either '+' or '-' |
| */ |
| public ArithmeticFactor(AbstractExpression parent, String arithmeticFactor) { |
| super(parent, arithmeticFactor); |
| operator = arithmeticFactor.charAt(0); |
| } |
| |
| @Override |
| public void accept(ExpressionVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public void acceptChildren(ExpressionVisitor visitor) { |
| getExpression().accept(visitor); |
| } |
| |
| @Override |
| protected void addChildrenTo(Collection<Expression> children) { |
| children.add(getExpression()); |
| } |
| |
| @Override |
| protected void addOrderedChildrenTo(List<Expression> children) { |
| |
| children.add(buildStringExpression(operator)); |
| |
| if (hasSpaceAfterArithmeticOperator) { |
| children.add(buildStringExpression(SPACE)); |
| } |
| |
| if (expression != null) { |
| children.add(expression); |
| } |
| } |
| |
| @Override |
| public JPQLQueryBNF findQueryBNF(Expression expression) { |
| |
| if ((this.expression != null) && this.expression.isAncestor(expression)) { |
| return getQueryBNF(ArithmeticPrimaryBNF.ID); |
| } |
| |
| return super.findQueryBNF(expression); |
| } |
| |
| /** |
| * Returns the {@link Expression} representing the arithmetic primary. |
| * |
| * @return The expression representing the arithmetic primary |
| */ |
| public Expression getExpression() { |
| if (expression == null) { |
| expression = buildNullExpression(); |
| } |
| return expression; |
| } |
| |
| @Override |
| public JPQLQueryBNF getQueryBNF() { |
| return getQueryBNF(ArithmeticFactorBNF.ID); |
| } |
| |
| @Override |
| protected boolean handleAggregate(JPQLQueryBNF queryBNF) { |
| return false; |
| } |
| |
| /** |
| * Determines whether the arithmetic primary was parsed. |
| * |
| * @return <code>true</code> the arithmetic primary was parsed; <code>false</code> if nothing was parsed |
| */ |
| public boolean hasExpression() { |
| return expression != null && |
| !expression.isNull(); |
| } |
| |
| /** |
| * Determines whether a whitespace was parsed after the arithmetic operator. |
| * |
| * @return <code>true</code> if there was a whitespace after the arithmetic operator; |
| * <code>false</code> otherwise |
| */ |
| public boolean hasSpaceAfterArithmeticOperator() { |
| return hasSpaceAfterArithmeticOperator; |
| } |
| |
| /** |
| * Determines if the arithmetic primary is prepended with the minus sign. |
| * |
| * @return <code>true</code> if the expression is prepended with '-'; <code>false</code> otherwise |
| */ |
| public boolean isNegative() { |
| return operator == '-'; |
| } |
| |
| @Override |
| protected boolean isParsingComplete(WordParser wordParser, String word, Expression expression) { |
| return wordParser.isArithmeticSymbol(wordParser.character()) || |
| super.isParsingComplete(wordParser, word, expression); |
| } |
| |
| /** |
| * Determines if the arithmetic primary is prepended with the plus sign. |
| * |
| * @return <code>true</code> if the expression is prepended with '+'; <code>false</code> otherwise |
| */ |
| public boolean isPositive() { |
| return operator == '+'; |
| } |
| |
| @Override |
| protected void parse(WordParser wordParser, boolean tolerant) { |
| |
| // Remove the arithmetic operator |
| wordParser.moveForward(1); |
| |
| hasSpaceAfterArithmeticOperator = (wordParser.skipLeadingWhitespace() > 0); |
| |
| // Parse the expression |
| expression = parse(wordParser, ArithmeticFactorBNF.ID, tolerant); |
| } |
| |
| @Override |
| protected void toParsedText(StringBuilder writer, boolean actual) { |
| |
| writer.append(operator); |
| |
| if (hasSpaceAfterArithmeticOperator) { |
| writer.append(SPACE); |
| } |
| |
| if (expression != null) { |
| expression.toParsedText(writer, actual); |
| } |
| } |
| } |