| /* |
| * 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 factory is responsible to return the right literal expression. |
| * |
| * @see StringLiteral |
| * @see InputParameter |
| * @see NumericLiteral |
| * @see KeywordExpression |
| * @see StateFieldPathExpression |
| * @see IdentificationVariable |
| * |
| * @version 2.5 |
| * @since 2.3 |
| * @author Pascal Filion |
| */ |
| public abstract class AbstractLiteralExpressionFactory extends ExpressionFactory { |
| |
| /** |
| * Creates a new <code>AbstractLiteralExpressionFactory</code>. |
| * |
| * @param id The unique identifier of this {@link ExpressionFactory} |
| */ |
| protected AbstractLiteralExpressionFactory(String id) { |
| super(id); |
| } |
| |
| /** |
| * Creates the actual {@link AbstractExpression} this factory manages. |
| * |
| * @param parent The parent {@link AbstractExpression} |
| * @param wordParser The text to parse based on the current position of the cursor |
| * @param word The current word being parsed |
| * @param expression During the parsing, it is possible the first part of an expression was |
| * parsed which needs to be used as a sub-expression of the newly created expression |
| * @return A new {@link AbstractExpression} representing the portion or the totality of the |
| * text held by {@link WordParser} starting at the cursor position |
| */ |
| protected abstract AbstractExpression buildExpression(AbstractExpression parent, |
| WordParser wordParser, |
| String word, |
| AbstractExpression expression, |
| boolean tolerant); |
| |
| @Override |
| protected AbstractExpression buildExpression(AbstractExpression parent, |
| WordParser wordParser, |
| String word, |
| JPQLQueryBNF queryBNF, |
| AbstractExpression expression, |
| boolean tolerant) { |
| |
| switch (wordParser.getWordType()) { |
| |
| case NUMERIC_LITERAL: { |
| expression = new NumericLiteral(parent, word); |
| expression.parse(wordParser, tolerant); |
| return expression; |
| } |
| |
| case STRING_LITERAL: { |
| expression = new StringLiteral(parent, word); |
| expression.parse(wordParser, tolerant); |
| return expression; |
| } |
| |
| case INPUT_PARAMETER: { |
| expression = new InputParameter(parent, word); |
| expression.parse(wordParser, tolerant); |
| return expression; |
| } |
| } |
| |
| // Path expression |
| if (word.indexOf(AbstractExpression.DOT) > -1) { |
| char character = word.charAt(0); |
| |
| if ((expression != null) && (character == AbstractExpression.DOT)) { |
| if (isCollection()) { |
| expression = new CollectionValuedPathExpression(parent, expression, word); |
| } |
| else { |
| expression = new StateFieldPathExpression(parent, expression, word); |
| } |
| } |
| else { |
| if (isCollection()) { |
| expression = new CollectionValuedPathExpression(parent, word); |
| } |
| else { |
| expression = new StateFieldPathExpression(parent, word); |
| } |
| } |
| |
| expression.parse(wordParser, tolerant); |
| return expression; |
| } |
| |
| // Checks for invalid JPQL queries |
| ExpressionRegistry registry = getExpressionRegistry(); |
| |
| if (tolerant && registry.isIdentifier(word)) { |
| ExpressionFactory factory = registry.expressionFactoryForIdentifier(word); |
| // TODO: Before creating the expression, check to make sure it's not a function: 'identifier(' |
| if (factory != null) { |
| expression = factory.buildExpression(parent, wordParser, word, queryBNF, expression, tolerant); |
| |
| if (expression != null) { |
| return new BadExpression(parent, expression); |
| } |
| } |
| } |
| |
| return buildExpression(parent, wordParser, word, expression, tolerant); |
| } |
| |
| /** |
| * Determines |
| * |
| */ |
| protected boolean isCollection() { |
| return false; |
| } |
| } |