pylucene 3.5.0-3

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

diff --git a/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/ScoringAggregator.java b/lucene-java-3.5.0/lucene/contrib/facet/src/java/org/apache/lucene/facet/search/aggregator/ScoringAggregator.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/ScoringAggregator.java
@@ -0,0 +1,58 @@
+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.
+ */
+
+/**
+ * An {@link Aggregator} which updates the weight of a category according to the
+ * scores of the documents it was found in.
+ * 
+ * @lucene.experimental
+ */
+public class ScoringAggregator implements Aggregator {
+
+  private final float[] scoreArray;
+  private float score;
+  private final int hashCode;
+  
+  public ScoringAggregator(float[] counterArray) {
+    this.scoreArray = counterArray;
+    this.hashCode = scoreArray == null ? 0 : scoreArray.hashCode();
+  }
+
+  public void aggregate(int ordinal) {
+    scoreArray[ordinal] += score;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (obj == null || obj.getClass() != this.getClass()) {
+      return false;
+    }
+    ScoringAggregator that = (ScoringAggregator) obj;
+    return that.scoreArray == this.scoreArray;
+  }
+
+  @Override
+  public int hashCode() {
+    return hashCode;
+  }
+
+  public void setNextDoc(int docid, float score) {
+    this.score = score;
+  }
+}