/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* 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.jboss.capedwarf.datastore;
import java.util.ArrayList;
import java.util.List;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.Transaction;
import org.jboss.capedwarf.datastore.metadata.MetadataQueryTypeFactory;
import org.jboss.capedwarf.datastore.query.DefaultQueryTypeFactory;
import org.jboss.capedwarf.datastore.query.QueryHandle;
import org.jboss.capedwarf.datastore.query.QueryHandleService;
import org.jboss.capedwarf.datastore.query.QueryTypeFactory;
import org.jboss.capedwarf.datastore.stats.StatsQueryTypeFactory;
/**
* Query type factory.
*
* @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
*/
public class QueryTypeFactories {
private final List<QueryTypeFactory> factories = new ArrayList<QueryTypeFactory>();
private final QueryHandleService service;
public QueryTypeFactories(QueryHandleService service) {
this.service = service;
// query type factories
factories.add(new StatsQueryTypeFactory());
factories.add(MetadataQueryTypeFactory.INSTANCE);
factories.add(DefaultQueryTypeFactory.INSTANCE);
// initialize
for (QueryTypeFactory factory : factories) {
factory.initialize(service);
}
}
public PreparedQuery prepare(Transaction tx, Query query) {
for (QueryTypeFactory factory : factories) {
if (factory.handleQuery(tx, query)) {
QueryHandle handle = factory.createQueryHandle(service);
return handle.createQuery(tx, query);
}
}
throw new IllegalArgumentException("No matching query type: " + query);
}
}