pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / facet / src / java / org / apache / lucene / facet / search / aggregator / association / AssociationIntSumAggregator.java

diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/association/AssociationIntSumAggregator.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/association/AssociationIntSumAggregator.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/association/AssociationIntSumAggregator.java
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+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);
+  }
+  
+}