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Lucene example source code file (NormalizeCharMap.java)

This example Lucene source code file (NormalizeCharMap.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

hashmap, map, map, mappingcharfilter, mappingcharfilter, normalizecharmap, normalizecharmap, runtimeexception, string, string, util

The Lucene NormalizeCharMap.java source code

 * 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.

package org.apache.lucene.analysis;

import java.util.HashMap;
import java.util.Map;

 * Holds a map of String input to String output, to be used
 * with {@link MappingCharFilter}.
public class NormalizeCharMap {

  Map<Character, NormalizeCharMap> submap;
  String normStr;
  int diff;

  /** Records a replacement to be applied to the inputs
   *  stream.  Whenever <code>singleMatch occurs in
   *  the input, it will be replaced with
   *  <code>replacement.
   * @param singleMatch input String to be replaced
   * @param replacement output String
  public void add(String singleMatch, String replacement) {
    NormalizeCharMap currMap = this;
    for(int i = 0; i < singleMatch.length(); i++) {
      char c = singleMatch.charAt(i);
      if (currMap.submap == null) {
        currMap.submap = new HashMap<Character, NormalizeCharMap>(1);
      NormalizeCharMap map = currMap.submap.get(Character.valueOf(c));
      if (map == null) {
        map = new NormalizeCharMap();
        currMap.submap.put(Character.valueOf(c), map);
      currMap = map;
    if (currMap.normStr != null) {
      throw new RuntimeException("MappingCharFilter: there is already a mapping for " + singleMatch);
    currMap.normStr = replacement;
    currMap.diff = singleMatch.length() - replacement.length();

Other Lucene examples (source code examples)

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