/*
* 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.usergrid.chop.webapp.service.chart.filter;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.usergrid.chop.webapp.service.chart.value.Value;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;
public class PercentileFilter {
public static Map<String, Collection<Value>> filter(Map<String, Collection<Value>> map, int percent) {
double percentile = new DescriptiveStatistics(toArray(map)).getPercentile(percent);
Map<String, Collection<Value>> resultMap = new LinkedHashMap<String, Collection<Value>>();
for (String key : map.keySet()) {
resultMap.put(key, doFilter(map.get(key), percentile));
}
return resultMap;
}
public static Collection<Value> filter(Collection<Value> values, double percent) {
double percentile = new DescriptiveStatistics(toArray(values)).getPercentile(percent);
return doFilter(values, percentile);
}
private static Collection<Value> doFilter(Collection<Value> values, double percentile) {
ArrayList<Value> resultValues = new ArrayList<Value>();
for (Value value : values) {
if (value.getValue() <= percentile) {
resultValues.add(value);
}
}
return resultValues;
}
private static double[] toArray(Map<String, Collection<Value>> map) {
double arr[] = {};
for (Collection<Value> valueList : map.values()) {
arr = ArrayUtils.addAll(arr, toArray(valueList));
}
return arr;
}
private static double[] toArray(Collection<Value> values) {
double arr[] = new double[values.size()];
int i = 0;
for (Value value : values) {
arr[i] = value.getValue();
i++;
}
return arr;
}
}