package org.apache.lucene.facet.search.aggregator.association;
import java.io.IOException;
import org.apache.lucene.facet.enhancements.association.AssociationsPayloadIterator;
import org.apache.lucene.facet.index.params.CategoryListParams;
import org.apache.lucene.facet.search.aggregator.Aggregator;
import org.apache.lucene.index.IndexReader;
/**
* 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.
*/
/**
* An {@link Aggregator} which updates the weight of a category by summing the
* weights of the float association it finds for every document.
*
* @lucene.experimental
*/
public class AssociationFloatSumAggregator implements Aggregator {
protected final String field;
protected final float[] sumArray;
protected final AssociationsPayloadIterator associationsPayloadIterator;
public AssociationFloatSumAggregator(IndexReader reader, float[] sumArray) throws IOException {
this(CategoryListParams.DEFAULT_TERM.field(), reader, sumArray);
}
public AssociationFloatSumAggregator(String field, IndexReader reader, float[] sumArray) throws IOException {
this.field = field;
associationsPayloadIterator = new AssociationsPayloadIterator(reader, field);
this.sumArray = sumArray;
}
public void aggregate(int ordinal) {
long association = associationsPayloadIterator.getAssociation(ordinal);
if (association != AssociationsPayloadIterator.NO_ASSOCIATION) {
sumArray[ordinal] += Float.intBitsToFloat((int) association);
}
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
AssociationFloatSumAggregator that = (AssociationFloatSumAggregator) obj;
return that.field.equals(field) && that.sumArray == sumArray;
}
@Override
public int hashCode() {
return field.hashCode();
}
public void setNextDoc(int docid, float score) throws IOException {
associationsPayloadIterator.setNextDoc(docid);
}
}