2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 package org.apache.lucene.analysis;
20 import java.util.HashMap;
24 * Holds a map of String input to String output, to be used
25 * with {@link MappingCharFilter}.
27 public class NormalizeCharMap {
29 Map<Character, NormalizeCharMap> submap;
33 /** Records a replacement to be applied to the inputs
34 * stream. Whenever <code>singleMatch</code> occurs in
35 * the input, it will be replaced with
36 * <code>replacement</code>.
38 * @param singleMatch input String to be replaced
39 * @param replacement output String
41 public void add(String singleMatch, String replacement) {
42 NormalizeCharMap currMap = this;
43 for(int i = 0; i < singleMatch.length(); i++) {
44 char c = singleMatch.charAt(i);
45 if (currMap.submap == null) {
46 currMap.submap = new HashMap<Character, NormalizeCharMap>(1);
48 NormalizeCharMap map = currMap.submap.get(Character.valueOf(c));
50 map = new NormalizeCharMap();
51 currMap.submap.put(Character.valueOf(c), map);
55 if (currMap.normStr != null) {
56 throw new RuntimeException("MappingCharFilter: there is already a mapping for " + singleMatch);
58 currMap.normStr = replacement;
59 currMap.diff = singleMatch.length() - replacement.length();