| /* |
| * 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.Locale; |
| import java.util.List; |
| import java.util.ArrayList; |
| |
| import org.apache.commons.math3.linear.Array2DRowRealMatrix; |
| import org.apache.commons.math3.linear.RealMatrix; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamExpression; |
| import org.apache.solr.client.solrj.io.stream.expr.StreamFactory; |
| |
| public class SumColumnsEvaluator extends RecursiveObjectEvaluator implements OneValueWorker { |
| protected static final long serialVersionUID = 1L; |
| |
| public SumColumnsEvaluator(StreamExpression expression, StreamFactory factory) throws IOException{ |
| super(expression, factory); |
| |
| if(1 != containedEvaluators.size()){ |
| throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting exactly 1 value but found %d",expression,containedEvaluators.size())); |
| } |
| } |
| |
| @Override |
| public Object doWork(Object value) throws IOException{ |
| if(null == value){ |
| return null; |
| } else if (value instanceof Matrix) { |
| |
| //First transpose the matrix |
| Matrix matrix = (Matrix) value; |
| double[][] data = matrix.getData(); |
| RealMatrix realMatrix = new Array2DRowRealMatrix(data, false); |
| |
| List<Number> sums = new ArrayList<>(data[0].length); |
| |
| for(int i=0; i<data[0].length; i++) { |
| double sum = 0; |
| double[] col = realMatrix.getColumn(i); |
| for(int j=0; j<col.length; j++){ |
| sum+=col[j]; |
| } |
| |
| sums.add(sum); |
| } |
| |
| return sums; |
| } else { |
| throw new IOException("Grand sum function only operates on a matrix"); |
| } |
| } |
| } |