org.apache.solr.analysis.CommonGramsFilterFactory Maven / Gradle / Ivy
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/**
* 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 java.io.IOException;
import java.util.List;
import java.util.Set;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.analysis.StopAnalyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.solr.common.ResourceLoader;
import org.apache.solr.common.util.StrUtils;
import org.apache.solr.util.plugin.ResourceLoaderAware;
/**
* Constructs a CommonGramsFilter
*/
/*
* This is pretty close to a straight copy from StopFilterFactory
*/
public class CommonGramsFilterFactory extends BaseTokenFilterFactory implements
ResourceLoaderAware {
public void inform(ResourceLoader loader) {
String commonWordFiles = args.get("words");
ignoreCase = getBoolean("ignoreCase", false);
if (commonWordFiles != null) {
try {
List files = StrUtils.splitFileNames(commonWordFiles);
if (commonWords == null && files.size() > 0){
//default stopwords list has 35 or so words, but maybe don't make it that big to start
commonWords = new CharArraySet(files.size() * 10, ignoreCase);
}
for (String file : files) {
List wlist = loader.getLines(file.trim());
//TODO: once StopFilter.makeStopSet(List) method is available, switch to using that so we can avoid a toArray() call
commonWords.addAll(CommonGramsFilter.makeCommonSet((String[])wlist.toArray(new String[0]), ignoreCase));
}
} catch (IOException e) {
throw new RuntimeException(e);
}
} else {
commonWords = (CharArraySet) CommonGramsFilter.makeCommonSet(StopAnalyzer.ENGLISH_STOP_WORDS, ignoreCase);
}
}
//Force the use of a char array set, as it is the most performant, although this may break things if Lucene ever goes away from it. See SOLR-1095
private CharArraySet commonWords;
private boolean ignoreCase;
public boolean isIgnoreCase() {
return ignoreCase;
}
public Set getCommonWords() {
return commonWords;
}
public CommonGramsFilter create(TokenStream input) {
CommonGramsFilter commonGrams = new CommonGramsFilter(input, commonWords, ignoreCase);
return commonGrams;
}
}