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Lucene example source code file (SimilarityDelegator.java)

This example Lucene source code file (SimilarityDelegator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

deprecated, deprecated, fieldinvertstate, override, override, similarity, similarity, similaritydelegator, similaritydelegator, string

The Lucene SimilarityDelegator.java source code

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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

/** Expert: Delegating scoring implementation.  Useful in {@link
 * Query#getSimilarity(Searcher)} implementations, to override only certain
 * methods of a Searcher's Similarity implementation..
 * @deprecated this class will be removed in 4.0.  Please
 * subclass {@link Similarity} or {@link DefaultSimilarity} instead. */
public class SimilarityDelegator extends Similarity {

  private Similarity delegee;

  /** Construct a {@link Similarity} that delegates all methods to another.
   * @param delegee the Similarity implementation to delegate to
  public SimilarityDelegator(Similarity delegee) {
    this.delegee = delegee;

  public float computeNorm(String fieldName, FieldInvertState state) {
    return delegee.computeNorm(fieldName, state);

  public float queryNorm(float sumOfSquaredWeights) {
    return delegee.queryNorm(sumOfSquaredWeights);

  public float tf(float freq) {
    return delegee.tf(freq);
  public float sloppyFreq(int distance) {
    return delegee.sloppyFreq(distance);
  public float idf(int docFreq, int numDocs) {
    return delegee.idf(docFreq, numDocs);
  public float coord(int overlap, int maxOverlap) {
    return delegee.coord(overlap, maxOverlap);

  public float scorePayload(int docId, String fieldName, int start, int end, byte [] payload, int offset, int length) {
    return delegee.scorePayload(docId, fieldName, start, end, payload, offset, length);

Other Lucene examples (source code examples)

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