| /* |
| * 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.analytics.function.reduction.data; |
| |
| import java.util.function.Consumer; |
| |
| import org.apache.solr.analytics.stream.reservation.DoubleCheckedReservation; |
| import org.apache.solr.analytics.stream.reservation.ReductionDataReservation; |
| import org.apache.solr.analytics.value.AnalyticsValueStream; |
| import org.apache.solr.analytics.value.DoubleValueStream; |
| |
| /** |
| * Collects the sum of the given {@link DoubleValueStream} parameter. |
| */ |
| public class SumCollector extends ReductionDataCollector<SumCollector.SumData> { |
| private final DoubleValueStream param; |
| public static final String name = "sum"; |
| private final String exprStr; |
| |
| public SumCollector(DoubleValueStream param) { |
| this.param = param; |
| this.exprStr = AnalyticsValueStream.createExpressionString(name,param); |
| } |
| |
| private double sum; |
| private boolean exists; |
| |
| /** |
| * Return the sum of the set data |
| * |
| * @return the sum |
| */ |
| public double sum() { |
| return sum; |
| } |
| |
| /** |
| * Return whether a sum exists. |
| * A sum will always exist if there is at least one existing value for the parameter, |
| * otherwise the sum does not exist. |
| * |
| * @return whether a sum exists |
| */ |
| public boolean exists() { |
| return exists; |
| } |
| |
| @Override |
| public SumData newData() { |
| SumData data = new SumData(); |
| data.sum = 0; |
| data.exists = false; |
| return data; |
| } |
| |
| double tempSum; |
| boolean tempExists; |
| @Override |
| public void collect() { |
| tempSum = 0; |
| tempExists = false; |
| param.streamDoubles( val -> { |
| tempSum += val; |
| tempExists = true; |
| }); |
| } |
| @Override |
| protected void apply(SumData data) { |
| data.sum += tempSum; |
| data.exists |= tempExists; |
| } |
| |
| @Override |
| public void submitReservations(Consumer<ReductionDataReservation<?,?>> consumer) { |
| consumer.accept(new DoubleCheckedReservation( |
| value -> { |
| ioData.sum += value; |
| ioData.exists = true; |
| }, |
| ()-> ioData.sum, |
| ()-> ioData.exists |
| )); |
| } |
| |
| @Override |
| public void setMergedData(ReductionData data) { |
| sum = ((SumData)data).sum; |
| exists = data.exists; |
| } |
| |
| @Override |
| public void setData(ReductionData data) { |
| sum = ((SumData)data).sum; |
| exists = data.exists; |
| } |
| |
| @Override |
| public String getName() { |
| return name; |
| } |
| @Override |
| public String getExpressionStr() { |
| return exprStr; |
| } |
| |
| public static class SumData extends ReductionData { |
| double sum; |
| } |
| } |