| /* |
| * 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.io.IOException; |
| import java.io.Reader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| import org.apache.lucene.analysis.CharFilterFactory; |
| import org.apache.lucene.util.ResourceLoader; |
| import org.apache.lucene.util.ResourceLoaderAware; |
| |
| /** |
| * Factory for {@link MappingCharFilter}. |
| * |
| * <pre class="prettyprint"> |
| * <fieldType name="text_map" class="solr.TextField" positionIncrementGap="100"> |
| * <analyzer> |
| * <charFilter class="solr.MappingCharFilterFactory" mapping="mapping.txt"/> |
| * <tokenizer class="solr.WhitespaceTokenizerFactory"/> |
| * </analyzer> |
| * </fieldType></pre> |
| * |
| * @since Solr 1.4 |
| * @lucene.spi {@value #NAME} |
| */ |
| public class MappingCharFilterFactory extends CharFilterFactory implements ResourceLoaderAware { |
| |
| /** SPI name */ |
| public static final String NAME = "mapping"; |
| |
| protected NormalizeCharMap normMap; |
| private final String mapping; |
| |
| /** Creates a new MappingCharFilterFactory */ |
| public MappingCharFilterFactory(Map<String, String> args) { |
| super(args); |
| mapping = get(args, "mapping"); |
| if (!args.isEmpty()) { |
| throw new IllegalArgumentException("Unknown parameters: " + args); |
| } |
| } |
| |
| /** Default ctor for compatibility with SPI */ |
| public MappingCharFilterFactory() { |
| throw defaultCtorException(); |
| } |
| |
| @Override |
| public void inform(ResourceLoader loader) throws IOException { |
| if (mapping != null) { |
| List<String> wlist = null; |
| List<String> files = splitFileNames(mapping); |
| wlist = new ArrayList<>(); |
| for (String file : files) { |
| List<String> lines = getLines(loader, file.trim()); |
| wlist.addAll(lines); |
| } |
| final NormalizeCharMap.Builder builder = new NormalizeCharMap.Builder(); |
| parseRules(wlist, builder); |
| normMap = builder.build(); |
| if (normMap.map == null) { |
| // if the inner FST is null, it means it accepts nothing (e.g. the file is empty) |
| // so just set the whole map to null |
| normMap = null; |
| } |
| } |
| } |
| |
| @Override |
| public Reader create(Reader input) { |
| // if the map is null, it means there's actually no mappings... just return the original stream |
| // as there is nothing to do here. |
| return normMap == null ? input : new MappingCharFilter(normMap, input); |
| } |
| |
| @Override |
| public Reader normalize(Reader input) { |
| return create(input); |
| } |
| |
| // "source" => "target" |
| static Pattern p = Pattern.compile("\"(.*)\"\\s*=>\\s*\"(.*)\"\\s*$"); |
| |
| protected void parseRules(List<String> rules, NormalizeCharMap.Builder builder) { |
| for (String rule : rules) { |
| Matcher m = p.matcher(rule); |
| if (!m.find()) |
| throw new IllegalArgumentException( |
| "Invalid Mapping Rule : [" + rule + "], file = " + mapping); |
| builder.add(parseString(m.group(1)), parseString(m.group(2))); |
| } |
| } |
| |
| char[] out = new char[256]; |
| |
| protected String parseString(String s) { |
| int readPos = 0; |
| int len = s.length(); |
| int writePos = 0; |
| while (readPos < len) { |
| char c = s.charAt(readPos++); |
| if (c == '\\') { |
| if (readPos >= len) |
| throw new IllegalArgumentException("Invalid escaped char in [" + s + "]"); |
| c = s.charAt(readPos++); |
| switch (c) { |
| case '\\': |
| c = '\\'; |
| break; |
| case '"': |
| c = '"'; |
| break; |
| case 'n': |
| c = '\n'; |
| break; |
| case 't': |
| c = '\t'; |
| break; |
| case 'r': |
| c = '\r'; |
| break; |
| case 'b': |
| c = '\b'; |
| break; |
| case 'f': |
| c = '\f'; |
| break; |
| case 'u': |
| if (readPos + 3 >= len) |
| throw new IllegalArgumentException("Invalid escaped char in [" + s + "]"); |
| c = (char) Integer.parseInt(s.substring(readPos, readPos + 4), 16); |
| readPos += 4; |
| break; |
| } |
| } |
| out[writePos++] = c; |
| } |
| return new String(out, 0, writePos); |
| } |
| } |