pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / backwards / src / test / org / apache / lucene / search / TestPositiveScoresOnlyCollector.java

diff --git a/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/search/TestPositiveScoresOnlyCollector.java b/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/search/TestPositiveScoresOnlyCollector.java
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+++ b/lucene-java-3.5.0/lucene/backwards/src/test/org/apache/lucene/search/TestPositiveScoresOnlyCollector.java
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+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;
+import org.apache.lucene.index.RandomIndexWriter;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestPositiveScoresOnlyCollector extends LuceneTestCase {
+
+  private static final class SimpleScorer extends Scorer {
+    private int idx = -1;
+    
+    public SimpleScorer(Weight weight) {
+      super(weight);
+    }
+    
+    @Override public float score() throws IOException {
+      return idx == scores.length ? Float.NaN : scores[idx];
+    }
+
+    @Override public int docID() { return idx; }
+
+    @Override public int nextDoc() throws IOException {
+      return ++idx != scores.length ? idx : NO_MORE_DOCS;
+    }
+    
+    @Override public int advance(int target) throws IOException {
+      idx = target;
+      return idx < scores.length ? idx : NO_MORE_DOCS;
+    }
+  }
+
+  // The scores must have positive as well as negative values
+  private static final float[] scores = new float[] { 0.7767749f, -1.7839992f,
+      8.9925785f, 7.9608946f, -0.07948637f, 2.6356435f, 7.4950366f, 7.1490803f,
+      -8.108544f, 4.961808f, 2.2423935f, -7.285586f, 4.6699767f };
+
+  public void testNegativeScores() throws Exception {
+  
+    // The Top*Collectors previously filtered out documents with <= scores. This
+    // behavior has changed. This test checks that if PositiveOnlyScoresFilter
+    // wraps one of these collectors, documents with <= 0 scores are indeed
+    // filtered.
+    
+    int numPositiveScores = 0;
+    for (int i = 0; i < scores.length; i++) {
+      if (scores[i] > 0) {
+        ++numPositiveScores;
+      }
+    }
+    
+    Directory directory = newDirectory();
+    RandomIndexWriter writer = new RandomIndexWriter(random, directory);
+    writer.commit();
+    IndexReader ir = writer.getReader();
+    writer.close();
+    IndexSearcher searcher = newSearcher(ir);
+    Weight fake = new TermQuery(new Term("fake", "weight")).createWeight(searcher);
+    Scorer s = new SimpleScorer(fake);
+    TopDocsCollector<ScoreDoc> tdc = TopScoreDocCollector.create(scores.length, true);
+    Collector c = new PositiveScoresOnlyCollector(tdc);
+    c.setScorer(s);
+    while (s.nextDoc() != DocIdSetIterator.NO_MORE_DOCS) {
+      c.collect(0);
+    }
+    TopDocs td = tdc.topDocs();
+    ScoreDoc[] sd = td.scoreDocs;
+    assertEquals(numPositiveScores, td.totalHits);
+    for (int i = 0; i < sd.length; i++) {
+      assertTrue("only positive scores should return: " + sd[i].score, sd[i].score > 0);
+    }
+    searcher.close();
+    ir.close();
+    directory.close();
+  }
+  
+}