beagled/Lucene.Net/Search/SimilarityDelegator.cs

   1 /*
   2  * Copyright 2005 The Apache Software Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 using System;
  18
  19 namespace Lucene.Net.Search
  20 {
  21
  22         /// <summary>Expert: Delegating scoring implementation.  Useful in {@link
  23         /// Query#GetSimilarity(Searcher)} implementations, to override only certain
  24         /// methods of a Searcher's Similiarty implementation..
  25         /// </summary>
  26         [Serializable]
  27         public class SimilarityDelegator : Similarity
  28         {
  29
  30                 private Similarity delegee;
  31
  32                 /// <summary>Construct a {@link Similarity} that delegates all methods to another.
  33                 ///
  34                 /// </summary>
  35                 /// <param name="delegee">the Similarity implementation to delegate to
  36                 /// </param>
  37                 public SimilarityDelegator(Similarity delegee)
  38                 {
  39                         this.delegee = delegee;
  40                 }
  41
  42                 public override float LengthNorm(System.String fieldName, int numTerms)
  43                 {
  44                         return delegee.LengthNorm(fieldName, numTerms);
  45                 }
  46
  47                 public override float QueryNorm(float sumOfSquaredWeights)
  48                 {
  49                         return delegee.QueryNorm(sumOfSquaredWeights);
  50                 }
  51
  52                 public override float Tf(float freq)
  53                 {
  54                         return delegee.Tf(freq);
  55                 }
  56
  57                 public override float SloppyFreq(int distance)
  58                 {
  59                         return delegee.SloppyFreq(distance);
  60                 }
  61
  62                 public override float Ldf(int docFreq, int numDocs)
  63                 {
  64                         return delegee.Ldf(docFreq, numDocs);
  65                 }
  66
  67                 public override float Coord(int overlap, int maxOverlap)
  68                 {
  69                         return delegee.Coord(overlap, maxOverlap);
  70                 }
  71         }
  72 }