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/*******************************************************************************
* Copyright (c) 2006, 2013 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 v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.jpql.parser;
import org.eclipse.persistence.jpa.jpql.WordParser;
/**
* This {@link ValueExpressionFactory} creates a general identification variable, which is either
* with the identifier KEY or VALUE and then checks the existence of a path expression.
*
* @see KeyExpressionFactory
* @see ValueExpressionFactory
*
* @version 2.4
* @since 2.3
* @author Pascal Filion
*/
public abstract class GeneralIdentificationExpressionFactory extends ExpressionFactory {
/**
* Creates a new GeneralIdentificationExpressionFactory
.
*
* @param id The unique identifier of this ExpressionFactory
* @param identifier The JPQL identifier handled by this factory
*/
public GeneralIdentificationExpressionFactory(String id, String identifier) {
super(id, identifier);
}
/**
* Creates the actual expression this factory manages.
*
* @param parent The parent of this expression
* @return The {@link Expression} this factory manages
*/
protected abstract AbstractExpression buildExpression(AbstractExpression parent);
/**
* {@inheritDoc}
*/
@Override
protected final AbstractExpression buildExpression(AbstractExpression parent,
WordParser wordParser,
String word,
JPQLQueryBNF queryBNF,
AbstractExpression expression,
boolean tolerant) {
expression = buildExpression(parent);
expression.parse(wordParser, tolerant);
if (wordParser.character() == AbstractExpression.DOT) {
ExpressionFactory factory = getExpressionRegistry().getExpressionFactory(queryBNF.getFallbackExpressionFactoryId());
expression = factory.buildExpression(parent, wordParser, wordParser.word(), queryBNF, expression, tolerant);
}
return expression;
}
}