org.apache.solr.analytics.statistics.PercentileStatsCollector.java Source code

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Here is the source code for org.apache.solr.analytics.statistics.PercentileStatsCollector.java

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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.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());
        }
    }

}