content: package org.apache.lucene.analysis.path;
  /**
   * 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 java.io.Reader;
  
  import org.apache.lucene.analysis.Tokenizer;
  import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
  import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;
  import org.apache.lucene.analysis.tokenattributes.PositionIncrementAttribute;
  
  /**
   *
   * Take something like:
   *
   * <pre>
   *  /something/something/else
   * </pre>
   *
   * and make:
   *
   * <pre>
   *  /something
   *  /something/something
   *  /something/something/else
   * </pre>
   */
  public class PathHierarchyTokenizer extends Tokenizer {
  
    public PathHierarchyTokenizer(Reader input) {
      this(input, DEFAULT_BUFFER_SIZE, DEFAULT_DELIMITER, DEFAULT_DELIMITER, DEFAULT_SKIP);
    }
  
    public PathHierarchyTokenizer(Reader input, int skip) {
      this(input, DEFAULT_BUFFER_SIZE, DEFAULT_DELIMITER, DEFAULT_DELIMITER, skip);
    }
  
    public PathHierarchyTokenizer(Reader input, int bufferSize, char delimiter) {
      this(input, bufferSize, delimiter, delimiter, DEFAULT_SKIP);
    }
  
    public PathHierarchyTokenizer(Reader input, char delimiter, char replacement) {
      this(input, DEFAULT_BUFFER_SIZE, delimiter, replacement, DEFAULT_SKIP);
    }
  
    public PathHierarchyTokenizer(Reader input, char delimiter, char replacement, int skip) {
      this(input, DEFAULT_BUFFER_SIZE, delimiter, replacement, skip);
    }
  
    public PathHierarchyTokenizer(Reader input, int bufferSize, char delimiter, char replacement, int skip) {
      super(input);
      termAtt.resizeBuffer(bufferSize);
  
      this.delimiter = delimiter;
      this.replacement = replacement;
      this.skip = skip;
      resultToken = new StringBuilder(bufferSize);
    }
  
    private static final int DEFAULT_BUFFER_SIZE = 1024;
    public static final char DEFAULT_DELIMITER = '/';
    public static final int DEFAULT_SKIP = 0;
  
    private final char delimiter;
    private final char replacement;
    private final int skip;
  
    private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
    private final OffsetAttribute offsetAtt = addAttribute(OffsetAttribute.class);
    private final PositionIncrementAttribute posAtt = addAttribute(PositionIncrementAttribute.class);
    private int startPosition = 0;
    private int finalOffset = 0;
    private int skipped = 0;
    private boolean endDelimiter = false;
    private StringBuilder resultToken;
  
  
    @Override
    public final boolean incrementToken() throws IOException {
      clearAttributes();
      termAtt.append( resultToken );
      if(resultToken.length() == 0){
        posAtt.setPositionIncrement(1);
      }
      else{
        posAtt.setPositionIncrement(0);
      }
      int length = 0;
      boolean added = false;
      if( endDelimiter ){
        termAtt.append(replacement);
        length++;
        endDelimiter = false;
        added = true;
      }
  
      while (true) {
        int c = input.read();
        if( c < 0 ){
          if( skipped > skip ) {
            length += resultToken.length();
            termAtt.setLength(length);
            finalOffset = correctOffset(startPosition + length);
            offsetAtt.setOffset(correctOffset(startPosition), finalOffset);
            if( added ){
              resultToken.setLength(0);
              resultToken.append(termAtt.buffer(), 0, length);
            }
            return added;
          }
          else{
            finalOffset = correctOffset(startPosition + length);
            return false;
          }
        }
        if( !added ){
          added = true;
          skipped++;
          if( skipped > skip ){
            termAtt.append(c == delimiter ? replacement : (char)c);
            length++;
          }
          else {
            startPosition++;
          }
        }
        else {
          if( c == delimiter ){
            if( skipped > skip ){
              endDelimiter = true;
              break;
            }
            skipped++;
            if( skipped > skip ){
              termAtt.append(replacement);
              length++;
            }
            else {
              startPosition++;
            }
          }
          else {
            if( skipped > skip ){
              termAtt.append((char)c);
              length++;
            }
            else {
              startPosition++;
            }
          }
        }
      }
      length += resultToken.length();
      termAtt.setLength(length);
      finalOffset = correctOffset(startPosition + length);
      offsetAtt.setOffset(correctOffset(startPosition), finalOffset);
      resultToken.setLength(0);
      resultToken.append(termAtt.buffer(), 0, length);
      return true;
    }
  
    @Override
    public final void end() {
      // set final offset
      offsetAtt.setOffset(finalOffset, finalOffset);
    }
  
    @Override
    public void reset(Reader input) throws IOException {
      super.reset(input);
      resultToken.setLength(0);
      finalOffset = 0;
      endDelimiter = false;
      skipped = 0;
    }
  }
  