1 package org.apache.lucene.facet.search.aggregator;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
21 * A CountingAggregator updates a counter array with the size of the whole
22 * taxonomy, counting the number of times each category appears in the given set
25 * @lucene.experimental
27 public class CountingAggregator implements Aggregator {
29 protected int[] counterArray;
31 public void aggregate(int ordinal) {
32 ++counterArray[ordinal];
35 public void setNextDoc(int docid, float score) {
36 // There's nothing for us to do here since we only increment the count by 1
37 // in this aggregator.
40 public CountingAggregator(int[] counterArray) {
41 this.counterArray = counterArray;
45 public boolean equals(Object obj) {
46 if (obj == null || obj.getClass() != this.getClass()) {
49 CountingAggregator that = (CountingAggregator) obj;
50 return that.counterArray == this.counterArray;
54 public int hashCode() {
55 int hashCode = counterArray == null ? 0 : counterArray.hashCode();