| /* |
| * 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.client.solrj.io.eval; |
| |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.Locale; |
| |
| import org.apache.commons.math3.random.EmpiricalDistribution; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class EmpiricalDistributionEvaluator extends RecursiveNumericEvaluator implements ManyValueWorker { |
| protected static final long serialVersionUID = 1L; |
| private int bins = 99; |
| |
| public EmpiricalDistributionEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{ |
| super(expression, factory); |
| |
| if(2 != containedEvaluators.size() && 1 != containedEvaluators.size()) { |
| throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting one or two values but found %d",expression,containedEvaluators.size())); |
| } |
| } |
| |
| @Override |
| public Object doWork(Object... values) throws IOException { |
| |
| if(!(values[0] instanceof List<?>)){ |
| throw new StreamEvaluatorException("List value expected but found type %s for value %s", values[0].getClass().getName(), values[0].toString()); |
| } |
| |
| if(values.length == 2) { |
| Number n = (Number)values[1]; |
| bins = n.intValue(); |
| } |
| |
| EmpiricalDistribution empiricalDistribution = new EmpiricalDistribution(bins); |
| |
| double[] backingValues = ((List<?>)values[0]).stream().mapToDouble(innerValue -> ((Number)innerValue).doubleValue()).sorted().toArray(); |
| |
| empiricalDistribution.load(backingValues); |
| |
| return empiricalDistribution; |
| } |
| } |
| |