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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.ExpressionTools;
import org.eclipse.persistence.jpa.jpql.WordParser;
/**
* This {@link UpdateItemStateFieldPathExpressionFactory} is meant to handle the parsing of a
* portion of the query when it's expected to be a state field path. By default a word without a dot
* would be parsed as an identification variable but for the left side of the update item assignment,
* a single word is a state field path expression.
*
* @see StateFieldPathExpression
*
* @version 2.5
* @since 2.3
* @author Pascal Filion
*/
@SuppressWarnings("nls")
public final class UpdateItemStateFieldPathExpressionFactory extends ExpressionFactory {
/**
* The unique identifier of this {@link StateFieldPathExpressionFactory}.
*/
public static final String ID = "update-item-state-field-path";
/**
* Creates a new UpdateItemStateFieldPathExpressionFactory
.
*/
public UpdateItemStateFieldPathExpressionFactory() {
super(ID);
}
/**
* {@inheritDoc}
*/
@Override
protected AbstractExpression buildExpression(AbstractExpression parent,
WordParser wordParser,
String word,
JPQLQueryBNF queryBNF,
AbstractExpression expression,
boolean tolerant) {
ExpressionRegistry registry = getExpressionRegistry();
// When the tolerant mode is turned on, parse the invalid portion of the query
if (tolerant && registry.isIdentifier(word)) {
ExpressionFactory factory = registry.expressionFactoryForIdentifier(word);
// Special case where the word is seen as an JPQL identifier but it's actually
// an unqualified path expression. Examples:
// UPDATE DateTime SET avg = 'JPQL'
// UPDATE DateTime SET timestamp = 'JPQL'
if (factory == null ||
registry.getIdentifierRole(word) == IdentifierRole.FUNCTION &&
!ExpressionTools.isFunctionExpression(wordParser, word)) {
expression = new StateFieldPathExpression(parent, word);
expression.parse(wordParser, tolerant);
return expression;
}
factory = registry.getExpressionFactory(StateFieldPathExpressionFactory.ID);
return factory.buildExpression(parent, wordParser, word, queryBNF, expression, tolerant);
}
// Create the state path expression
expression = new StateFieldPathExpression(parent, word);
expression.parse(wordParser, tolerant);
return expression;
}
}