--- /dev/null
+package org.apache.lucene.facet.enhancements.association;
+
+import org.apache.lucene.facet.index.attributes.CategoryProperty;
+
+/**
+ * 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 AssociationProperty} which treats the association as int - merges
+ * two associations by summation.
+ *
+ * @lucene.experimental
+ */
+public class AssociationIntProperty extends AssociationProperty {
+
+ /**
+ * @param value
+ * The association value.
+ */
+ public AssociationIntProperty(int value) {
+ super(value);
+ }
+
+ @Override
+ public boolean equals(Object other) {
+ if (other == this) {
+ return true;
+ }
+ if (!(other instanceof AssociationIntProperty)) {
+ return false;
+ }
+ AssociationIntProperty o = (AssociationIntProperty) other;
+ return o.association == this.association;
+ }
+
+ @Override
+ public int hashCode() {
+ return "AssociationIntProperty".hashCode() * 31 + (int) association;
+ }
+
+ public void merge(CategoryProperty other) {
+ AssociationIntProperty o = (AssociationIntProperty) other;
+ this.association += o.association;
+ }
+
+}