pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / src / java / org / apache / lucene / search / PositiveScoresOnlyCollector.java

diff --git a/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PositiveScoresOnlyCollector.java b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PositiveScoresOnlyCollector.java
new file mode 100644 (file)
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+++ b/lucene-java-3.5.0/lucene/src/java/org/apache/lucene/search/PositiveScoresOnlyCollector.java
@@ -0,0 +1,63 @@
+package org.apache.lucene.search;
+
+/**
+ * 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.
+ */
+
+import java.io.IOException;
+
+import org.apache.lucene.index.IndexReader;
+
+/**
+ * A {@link Collector} implementation which wraps another
+ * {@link Collector} and makes sure only documents with
+ * scores > 0 are collected.
+ */
+public class PositiveScoresOnlyCollector extends Collector {
+
+  final private Collector c;
+  private Scorer scorer;
+  
+  public PositiveScoresOnlyCollector(Collector c) {
+    this.c = c;
+  }
+  
+  @Override
+  public void collect(int doc) throws IOException {
+    if (scorer.score() > 0) {
+      c.collect(doc);
+    }
+  }
+
+  @Override
+  public void setNextReader(IndexReader reader, int docBase) throws IOException {
+    c.setNextReader(reader, docBase);
+  }
+
+  @Override
+  public void setScorer(Scorer scorer) throws IOException {
+    // Set a ScoreCachingWrappingScorer in case the wrapped Collector will call
+    // score() also.
+    this.scorer = new ScoreCachingWrappingScorer(scorer);
+    c.setScorer(this.scorer);
+  }
+
+  @Override
+  public boolean acceptsDocsOutOfOrder() {
+    return c.acceptsDocsOutOfOrder();
+  }
+
+}