/*
* 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.solr.analytics.statistics;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.solr.analytics.util.PercentileCalculator;
import com.google.common.collect.Iterables;
/**
* <code>PercentileStatsCollector</code> computes a given list of percentiles.
*/
@SuppressWarnings("rawtypes")
public class PercentileStatsCollector extends AbstractDelegatingStatsCollector{
public final List<Comparable> values = new ArrayList<>();
public static final Pattern PERCENTILE_PATTERN = Pattern.compile("perc(?:entile)?_(\\d+)",Pattern.CASE_INSENSITIVE);
protected final double[] percentiles;
protected final String[] percentileNames;
protected Comparable[] results;
public PercentileStatsCollector(StatsCollector delegate, double[] percentiles, String[] percentileNames) {
super(delegate);
this.percentiles = percentiles;
this.percentileNames = percentileNames;
}
@Override
public Comparable getStat(String stat) {
for( int i=0; i < percentiles.length; i++ ){
if (stat.equals(percentileNames[i])) {
if (results!=null) {
return results[i];
} else {
return null;
}
}
}
return delegate.getStat(stat);
}
public void compute(){
delegate.compute();
if (values.size()>0) {
results = Iterables.toArray(getPercentiles(),Comparable.class);
} else {
results = null;
}
}
@SuppressWarnings({ "unchecked"})
protected List<Comparable> getPercentiles() {
return PercentileCalculator.getPercentiles(values, percentiles);
}
public void collect(int doc) throws IOException {
super.collect(doc);
if (value.exists) {
values.add((Comparable)value.toObject());
}
}
}