/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.processors;
import static org.apache.commons.lang.StringUtils.isBlank;
import java.util.Map;
import java.util.HashMap;
import org.apache.hadoop.hive.ql.Driver;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.conf.HiveConf;
/**
* CommandProcessorFactory.
*
*/
public final class CommandProcessorFactory {
private CommandProcessorFactory() {
// prevent instantiation
}
static Map<HiveConf, Driver> mapDrivers = new HashMap<HiveConf, Driver>();
public static CommandProcessor get(String cmd) {
return get(cmd, null);
}
public static CommandProcessor get(String cmd, HiveConf conf) {
String cmdl = cmd.toLowerCase();
if ("set".equals(cmdl)) {
return new SetProcessor();
} else if ("dfs".equals(cmdl)) {
SessionState ss = SessionState.get();
return new DfsProcessor(ss.getConf());
} else if ("add".equals(cmdl)) {
return new AddResourceProcessor();
} else if ("delete".equals(cmdl)) {
return new DeleteResourceProcessor();
} else if (!isBlank(cmd)) {
if (conf == null) {
return new Driver();
}
Driver drv = mapDrivers.get(conf);
if (drv == null) {
drv = new Driver();
mapDrivers.put(conf, drv);
}
drv.init();
return drv;
}
return null;
}
public static void clean(HiveConf conf) {
Driver drv = mapDrivers.get(conf);
if (drv != null) {
drv.destroy();
}
mapDrivers.remove(conf);
}
}