pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/CountingAggregator.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/CountingAggregator.java
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+++ b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/CountingAggregator.java
@@ -0,0 +1,59 @@
+package org.apache.lucene.facet.search.aggregator;
+
+/**
+ * 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.
+ */
+
+/**
+ * A CountingAggregator updates a counter array with the size of the whole
+ * taxonomy, counting the number of times each category appears in the given set
+ * of documents.
+ * 
+ * @lucene.experimental
+ */
+public class CountingAggregator implements Aggregator {
+
+  protected int[] counterArray;
+
+  public void aggregate(int ordinal) {
+    ++counterArray[ordinal];
+  }
+
+  public void setNextDoc(int docid, float score) {
+    // There's nothing for us to do here since we only increment the count by 1
+    // in this aggregator.
+  }
+
+  public CountingAggregator(int[] counterArray) {
+    this.counterArray = counterArray;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj == null || obj.getClass() != this.getClass()) {
+      return false;
+    }
+    CountingAggregator that = (CountingAggregator) obj;
+    return that.counterArray == this.counterArray;
+  }
+
+  @Override
+  public int hashCode() {
+    int hashCode = counterArray == null ? 0 : counterArray.hashCode();
+
+    return hashCode;
+  }
+}