home | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Lucene example source code file (LimitTokenCountAnalyzer.java)

This example Lucene source code file (LimitTokenCountAnalyzer.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

analyzer, io, ioexception, limittokencountanalyzer, limittokencountanalyzer, limittokencountfilter, override, override, reader, reader, string, tokenstream, tokenstream

The Lucene LimitTokenCountAnalyzer.java source code

package org.apache.lucene.analysis;

/**
 * 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 org.apache.lucene.document.Fieldable;

import java.io.Reader;
import java.io.IOException;

/**
 * This Analyzer limits the number of tokens while indexing. It is
 * a replacement for the maximum field length setting inside {@link org.apache.lucene.index.IndexWriter}.
 */
public final class LimitTokenCountAnalyzer extends Analyzer {
  private final Analyzer delegate;
  private final int maxTokenCount;

  /**
   * Build an analyzer that limits the maximum number of tokens per field.
   */
  public LimitTokenCountAnalyzer(Analyzer delegate, int maxTokenCount) {
    this.delegate = delegate;
    this.maxTokenCount = maxTokenCount;
  }
  
  @Override
  public TokenStream tokenStream(String fieldName, Reader reader) {
    return new LimitTokenCountFilter(
      delegate.tokenStream(fieldName, reader), maxTokenCount
    );
  }
  
  @Override
  public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException {
    return new LimitTokenCountFilter(
      delegate.reusableTokenStream(fieldName, reader), maxTokenCount
    );
  }
  
  @Override
  public int getPositionIncrementGap(String fieldName) {
    return delegate.getPositionIncrementGap(fieldName);
  }

  @Override
  public int getOffsetGap(Fieldable field) {
    return delegate.getOffsetGap(field);
  }
  
  @Override
  public String toString() {
    return "LimitTokenCountAnalyzer(" + delegate.toString() + ", maxTokenCount=" + maxTokenCount + ")";
  }
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene LimitTokenCountAnalyzer.java source code file:



my book on functional programming

 

new blog posts

 

Copyright 1998-2019 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.