--- /dev/null
+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 integer association it finds for every document.
+ *
+ * @lucene.experimental
+ */
+public class AssociationIntSumAggregator implements Aggregator {
+
+ protected final String field;
+ protected final int[] sumArray;
+ protected final AssociationsPayloadIterator associationsPayloadIterator;
+
+ public AssociationIntSumAggregator(IndexReader reader, int[] sumArray) throws IOException {
+ this(CategoryListParams.DEFAULT_TERM.field(), reader, sumArray);
+ }
+
+ public AssociationIntSumAggregator(String field, IndexReader reader, int[] 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] += association;
+ }
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ if (obj == null || obj.getClass() != this.getClass()) {
+ return false;
+ }
+ AssociationIntSumAggregator that = (AssociationIntSumAggregator) 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);
+ }
+
+}