/**
* 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.
*/
package org.apache.lucene.analysis.charfilter;
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</code> occurs in
* the input, it will be replaced with
* <code>replacement</code>.
*
* @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();
}
}