/*
* Copyright (c) 2011-2015 EPFL DATA Laboratory
* Copyright (c) 2014-2015 The Squall Collaboration (see NOTICE)
*
* All rights reserved.
*
* Licensed 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 ch.epfl.data.squall.api.sql.estimators;
import java.util.Map;
import ch.epfl.data.squall.utilities.SystemParameters;
public class ConfigSelectivityEstimator {
private final Map _map;
public ConfigSelectivityEstimator(Map map) {
_map = map;
}
/*
* read selectivity from the config file
*/
public double estimate(String compName) {
final String selStr = compName + "_SEL";
return SystemParameters.getDouble(_map, selStr);
}
}