solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/TriangularDistributionEvaluator.java

/*
 * 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 org.apache.commons.math3.distribution.TriangularDistribution;
import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;

public class TriangularDistributionEvaluator extends RecursiveNumericEvaluator implements ManyValueWorker {

  private static final long serialVersionUID = 1;

  public TriangularDistributionEvaluator(StreamExpression expression, StreamFactory factory) throws IOException {
    super(expression, factory);
  }

  @Override
  public Object doWork(Object... values) throws IOException {

    if (values.length != 3) {
      throw new IOException("Triangular distribution requires three numeric parameters low, mode, high");
    }

    double low = ((Number) values[0]).doubleValue();
    double mode = ((Number) values[1]).doubleValue();
    double high = ((Number) values[2]).doubleValue();

    return new TriangularDistribution(low, mode, high);
  }
}