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/*
* 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.drill.exec.physical.impl.statistics;
import java.util.HashMap;
public class MergedStatisticFactory {
private HashMap<String,Class<? extends MergedStatistic>> statsClasses = new HashMap<>( );
/*
* Creates the appropriate statistics object given the name of the statistics and the input statistic
*/
private static MergedStatisticFactory instance = new MergedStatisticFactory();
//Can not instantiate
private MergedStatisticFactory() {
statsClasses.put(Statistic.COLNAME, ColumnMergedStatistic.class);
statsClasses.put(Statistic.COLTYPE, ColTypeMergedStatistic.class);
statsClasses.put(Statistic.ROWCOUNT, RowCountMergedStatistic.class);
statsClasses.put(Statistic.NNROWCOUNT, NNRowCountMergedStatistic.class);
statsClasses.put(Statistic.AVG_WIDTH, AvgWidthMergedStatistic.class);
statsClasses.put(Statistic.HLL_MERGE, HLLMergedStatistic.class);
statsClasses.put(Statistic.NDV, NDVMergedStatistic.class);
statsClasses.put(Statistic.SUM_DUPS, CntDupsMergedStatistic.class);
}
private MergedStatistic newMergedStatistic(String outputStatName)
throws InstantiationException, IllegalAccessException {
MergedStatistic stat = statsClasses.get(outputStatName).newInstance();
return stat;
}
public static MergedStatistic getMergedStatistic(String outputStatName, String inputStatName, double samplePercent) {
try {
MergedStatistic statistic = instance.newMergedStatistic(outputStatName);
if (statistic == null) {
throw new IllegalArgumentException("No implementation found for " + outputStatName);
} else {
statistic.initialize(inputStatName, samplePercent);
return statistic;
}
} catch (InstantiationException ex) {
throw new IllegalArgumentException("Cannot instantiate class for " + outputStatName);
} catch (IllegalAccessException ex) {
throw new IllegalArgumentException("Cannot access class for " + outputStatName);
}
}
}
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