/*
* Copyright (C) 2003-2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.chromattic.core.query;
import org.chromattic.api.query.QueryLanguage;
import org.chromattic.api.query.ObjectQuery;
import org.chromattic.api.UndeclaredRepositoryException;
import org.chromattic.core.DomainSession;
import javax.jcr.RepositoryException;
import java.util.Map;
import java.util.EnumMap;
import java.util.HashMap;
/**
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public class QueryManager {
/** . */
private static EnumMap<QueryLanguage, String> languages = new EnumMap<QueryLanguage, String>(QueryLanguage.class);
static {
languages.put(QueryLanguage.SQL, javax.jcr.query.Query.SQL);
languages.put(QueryLanguage.XPATH, javax.jcr.query.Query.XPATH);
}
/** . */
private EnumMap<QueryLanguage, Map<ObjectQueryKey, ObjectQuery<?>>> globalQueryCache;
/** . */
private final DomainSession domainSession;
public QueryManager(DomainSession domainSession) {
this.domainSession = domainSession;
}
public <O> ObjectQuery<O> getObjectQuery(Class<O> objectClass, String statement) {
try {
// For now we support on SQL
QueryLanguage language = QueryLanguage.SQL;
ObjectQueryKey key = new ObjectQueryKey(objectClass, statement);
ObjectQuery<?> query = null;
if (globalQueryCache != null) {
Map<ObjectQueryKey, ObjectQuery<?>> queryCache = globalQueryCache.get(language);
if (queryCache != null) {
query = queryCache.get(key);
}
}
//
if (query == null) {
String jcrLanguage = languages.get(language);
query = new ObjectQueryImpl<O>(objectClass, domainSession, statement);
//
Map<ObjectQueryKey, ObjectQuery<?>> queryCache;
if (globalQueryCache == null) {
globalQueryCache = new EnumMap<QueryLanguage, Map<ObjectQueryKey, ObjectQuery<?>>>(QueryLanguage.class);
queryCache = new HashMap<ObjectQueryKey, ObjectQuery<?>>();
globalQueryCache.put(language, queryCache);
} else {
queryCache = globalQueryCache.get(language);
if (queryCache == null) {
globalQueryCache.put(language, queryCache);
}
}
queryCache.put(key, query);
}
//
@SuppressWarnings("unchecked") ObjectQuery<O> ret = (ObjectQuery<O>)query;
return ret;
}
catch (RepositoryException e) {
throw new UndeclaredRepositoryException(e);
}
}
}