/**
* 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.solr.analysis;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.miscellaneous.WordDelimiterFilter;
import org.apache.lucene.analysis.miscellaneous.WordDelimiterIterator;
import org.apache.lucene.analysis.util.CharArraySet;
import org.apache.solr.util.plugin.ResourceLoaderAware;
import org.apache.solr.common.ResourceLoader;
import org.apache.solr.common.util.StrUtils;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.IOException;
/**
* @version $Id: WordDelimiterFilterFactory.java 990451 2010-08-28 21:25:44Z rmuir $
*/
public class WordDelimiterFilterFactory extends BaseTokenFilterFactory implements ResourceLoaderAware {
public static final String PROTECTED_TOKENS = "protected";
public static final String TYPES = "types";
public void inform(ResourceLoader loader) {
String wordFiles = args.get(PROTECTED_TOKENS);
if (wordFiles != null) {
try {
protectedWords = getWordSet(loader, wordFiles, false);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
String types = args.get(TYPES);
if (types != null) {
try {
List<String> files = StrUtils.splitFileNames( types );
List<String> wlist = new ArrayList<String>();
for( String file : files ){
List<String> lines = loader.getLines( file.trim() );
wlist.addAll( lines );
}
typeTable = parseTypes(wlist);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
private CharArraySet protectedWords = null;
int generateWordParts=0;
int generateNumberParts=0;
int catenateWords=0;
int catenateNumbers=0;
int catenateAll=0;
int splitOnCaseChange=0;
int splitOnNumerics=0;
int preserveOriginal=0;
int stemEnglishPossessive=0;
byte[] typeTable = null;
@Override
public void init(Map<String, String> args) {
super.init(args);
generateWordParts = getInt("generateWordParts", 1);
generateNumberParts = getInt("generateNumberParts", 1);
catenateWords = getInt("catenateWords", 0);
catenateNumbers = getInt("catenateNumbers", 0);
catenateAll = getInt("catenateAll", 0);
splitOnCaseChange = getInt("splitOnCaseChange", 1);
splitOnNumerics = getInt("splitOnNumerics", 1);
preserveOriginal = getInt("preserveOriginal", 0);
stemEnglishPossessive = getInt("stemEnglishPossessive", 1);
}
public WordDelimiterFilter create(TokenStream input) {
return new WordDelimiterFilter(input, typeTable == null ? WordDelimiterIterator.DEFAULT_WORD_DELIM_TABLE : typeTable,
generateWordParts, generateNumberParts,
catenateWords, catenateNumbers, catenateAll,
splitOnCaseChange, preserveOriginal,
splitOnNumerics, stemEnglishPossessive, protectedWords);
}
// source => type
private static Pattern typePattern = Pattern.compile( "(.*)\\s*=>\\s*(.*)\\s*$" );
/** parses a list of MappingCharFilter style rules into a custom byte[] type table */
private byte[] parseTypes(List<String> rules) {
SortedMap<Character,Byte> typeMap = new TreeMap<Character,Byte>();
for( String rule : rules ){
Matcher m = typePattern.matcher(rule);
if( !m.find() )
throw new RuntimeException("Invalid Mapping Rule : [" + rule + "]");
String lhs = parseString(m.group(1).trim());
Byte rhs = parseType(m.group(2).trim());
if (lhs.length() != 1)
throw new RuntimeException("Invalid Mapping Rule : [" + rule + "]. Only a single character is allowed.");
if (rhs == null)
throw new RuntimeException("Invalid Mapping Rule : [" + rule + "]. Illegal type.");
typeMap.put(lhs.charAt(0), rhs);
}
// ensure the table is always at least as big as DEFAULT_WORD_DELIM_TABLE for performance
byte types[] = new byte[Math.max(typeMap.lastKey()+1, WordDelimiterIterator.DEFAULT_WORD_DELIM_TABLE.length)];
for (int i = 0; i < types.length; i++)
types[i] = WordDelimiterIterator.getType(i);
for (Map.Entry<Character,Byte> mapping : typeMap.entrySet())
types[mapping.getKey()] = mapping.getValue();
return types;
}
private Byte parseType(String s) {
if (s.equals("LOWER"))
return WordDelimiterFilter.LOWER;
else if (s.equals("UPPER"))
return WordDelimiterFilter.UPPER;
else if (s.equals("ALPHA"))
return WordDelimiterFilter.ALPHA;
else if (s.equals("DIGIT"))
return WordDelimiterFilter.DIGIT;
else if (s.equals("ALPHANUM"))
return WordDelimiterFilter.ALPHANUM;
else if (s.equals("SUBWORD_DELIM"))
return WordDelimiterFilter.SUBWORD_DELIM;
else
return null;
}
char[] out = new char[256];
private 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 RuntimeException( "Invalid escaped char in [" + s + "]" );
c = s.charAt( readPos++ );
switch( c ) {
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 RuntimeException( "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 );
}
}