| /* |
| * 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.ArrayList; |
| |
| import org.apache.commons.math3.analysis.function.HarmonicOscillator; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class OscillateEvaluator extends RecursiveNumericEvaluator implements ManyValueWorker { |
| protected static final long serialVersionUID = 1L; |
| |
| public OscillateEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{ |
| super(expression, factory); |
| } |
| |
| @Override |
| @SuppressWarnings({"unchecked"}) |
| public Object doWork(Object... objects) throws IOException{ |
| |
| if(objects.length != 3) { |
| throw new IOException("The oscillate function takes 3 arguments."); |
| } |
| |
| double amp = ((Number)objects[0]).doubleValue(); |
| double om = ((Number)objects[1]).doubleValue(); |
| double phase = ((Number)objects[2]).doubleValue(); |
| |
| |
| HarmonicOscillator pf = new HarmonicOscillator(amp, om, phase); |
| double[] x = new double[128]; |
| |
| @SuppressWarnings({"rawtypes"}) |
| List list = new ArrayList(); |
| for(int i=0; i<128; i++) { |
| double yvalue= pf.value(i); |
| list.add(yvalue); |
| x[i] = i; |
| } |
| |
| VectorFunction func = new VectorFunction(pf, list); |
| func.addToContext("x", x); |
| return func; |
| } |
| } |