/*******************************************************************************
* Copyright (c) 1998, 2010 Oracle. 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 from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.jpa.parsing.jpql;
import org.eclipse.persistence.internal.jpa.parsing.JPQLParseTree;
import org.eclipse.persistence.queries.ObjectLevelReadQuery;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.queries.DatabaseQuery;
/**
* Factory class used to isolate Antlr dependencies.
*/
public class JPQLParserFactory {
public JPQLParserFactory() {
}
public JPQLParser buildParserFor(String ejbqlString) {
return JPQLParser.buildParserFor(ejbqlString);
}
public JPQLParser parseEJBQLString(String ejbqlString) {
JPQLParser parser = buildParserFor(ejbqlString);
parser.parse();
return parser;
}
/**
* Populate the query using the information retrieved from parsing the JPQL.
*/
public void populateQuery(String jpqlString, ObjectLevelReadQuery query, AbstractSession session) {
// PERF: Check if the JPQL has already been parsed.
// Only allow queries with default properties to be parse cached.
boolean isCacheable = query.isDefaultPropertiesQuery();
DatabaseQuery cachedQuery = null;
if (isCacheable) {
cachedQuery = (DatabaseQuery)session.getProject().getJPQLParseCache().get(jpqlString);
}
if ((cachedQuery == null)
|| (!cachedQuery.isPrepared())
|| (cachedQuery.getClass() != query.getClass())) {
JPQLParser parser = parseEJBQLString(jpqlString);
JPQLParseTree parseTree = parser.getParseTree();
parseTree.populateQuery(query, session);
if (isCacheable) {
session.getProject().getJPQLParseCache().put(jpqlString, query);
}
} else {
query.prepareFromQuery(cachedQuery);
query.setIsPrepared(true);
}
}
}