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