/*
* 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.mahout.utils.regex;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.util.Version;
import org.apache.mahout.common.lucene.TokenStreamIterator;
import java.io.IOException;
import java.io.StringReader;
public class AnalyzerTransformer implements RegexTransformer {
private Analyzer analyzer;
private String fieldName = "text";
public AnalyzerTransformer() {
this(new StandardAnalyzer(Version.LUCENE_34), "text");
}
public AnalyzerTransformer(Analyzer analyzer) {
this(analyzer, "text");
}
public AnalyzerTransformer(Analyzer analyzer, String fieldName) {
this.analyzer = analyzer;
this.fieldName = fieldName;
}
@Override
public String transformMatch(String match) {
StringBuilder result = new StringBuilder();
try {
TokenStream ts = analyzer.reusableTokenStream(fieldName, new StringReader(match));
ts.addAttribute(CharTermAttribute.class);
TokenStreamIterator iter = new TokenStreamIterator(ts);
while (iter.hasNext()) {
result.append(iter.next()).append(' ');
}
} catch (IOException e) {
throw new IllegalStateException(e);
}
return result.toString();
}
public Analyzer getAnalyzer() {
return analyzer;
}
public void setAnalyzer(Analyzer analyzer) {
this.analyzer = analyzer;
}
}