pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.4.0 / lucene / src / java / org / apache / lucene / search / DefaultSimilarity.java

diff --git a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/DefaultSimilarity.java b/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/DefaultSimilarity.java
deleted file mode 100644 (file)
index e321ff3..0000000
--- a/lucene-java-3.4.0/lucene/src/java/org/apache/lucene/search/DefaultSimilarity.java
+++ /dev/null
@@ -1,93 +0,0 @@
-package org.apache.lucene.search;
-
-import org.apache.lucene.index.FieldInvertState;
-
-/**
- * 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.
- */
-
-/** Expert: Default scoring implementation. */
-public class DefaultSimilarity extends Similarity {
-
-  /** Implemented as
-   *  <code>state.getBoost()*lengthNorm(numTerms)</code>, where
-   *  <code>numTerms</code> is {@link FieldInvertState#getLength()} if {@link
-   *  #setDiscountOverlaps} is false, else it's {@link
-   *  FieldInvertState#getLength()} - {@link
-   *  FieldInvertState#getNumOverlap()}.
-   *
-   *  @lucene.experimental */
-  @Override
-  public float computeNorm(String field, FieldInvertState state) {
-    final int numTerms;
-    if (discountOverlaps)
-      numTerms = state.getLength() - state.getNumOverlap();
-    else
-      numTerms = state.getLength();
-    return state.getBoost() * ((float) (1.0 / Math.sqrt(numTerms)));
-  }
-  
-  /** Implemented as <code>1/sqrt(sumOfSquaredWeights)</code>. */
-  @Override
-  public float queryNorm(float sumOfSquaredWeights) {
-    return (float)(1.0 / Math.sqrt(sumOfSquaredWeights));
-  }
-
-  /** Implemented as <code>sqrt(freq)</code>. */
-  @Override
-  public float tf(float freq) {
-    return (float)Math.sqrt(freq);
-  }
-    
-  /** Implemented as <code>1 / (distance + 1)</code>. */
-  @Override
-  public float sloppyFreq(int distance) {
-    return 1.0f / (distance + 1);
-  }
-    
-  /** Implemented as <code>log(numDocs/(docFreq+1)) + 1</code>. */
-  @Override
-  public float idf(int docFreq, int numDocs) {
-    return (float)(Math.log(numDocs/(double)(docFreq+1)) + 1.0);
-  }
-    
-  /** Implemented as <code>overlap / maxOverlap</code>. */
-  @Override
-  public float coord(int overlap, int maxOverlap) {
-    return overlap / (float)maxOverlap;
-  }
-
-  // Default true
-  protected boolean discountOverlaps = true;
-
-  /** Determines whether overlap tokens (Tokens with
-   *  0 position increment) are ignored when computing
-   *  norm.  By default this is true, meaning overlap
-   *  tokens do not count when computing norms.
-   *
-   *  @lucene.experimental
-   *
-   *  @see #computeNorm
-   */
-  public void setDiscountOverlaps(boolean v) {
-    discountOverlaps = v;
-  }
-
-  /** @see #setDiscountOverlaps */
-  public boolean getDiscountOverlaps() {
-    return discountOverlaps;
-  }
-}