com.bizosys.unstructured.CustomAnalyzerExample.java Source code

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Here is the source code for com.bizosys.unstructured.CustomAnalyzerExample.java

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/*
* Copyright 2013 Bizosys Technologies Limited
*
* Licensed to the Bizosys Technologies Limited (Bizosys) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The Bizosys 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 com.bizosys.unstructured;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.HashSet;
import java.util.Set;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.LowerCaseFilter;
import org.apache.lucene.analysis.PorterStemFilter;
import org.apache.lucene.analysis.StopFilter;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.standard.StandardTokenizer;
import org.apache.lucene.analysis.synonym.SynonymFilter;
import org.apache.lucene.analysis.synonym.SynonymMap;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Fieldable;
import org.apache.lucene.util.CharsRef;
import org.apache.lucene.util.Version;

public class CustomAnalyzerExample extends Analyzer {

    @Override
    public TokenStream tokenStream(String field, Reader reader) {
        Tokenizer tokenizer = new StandardTokenizer(Version.LUCENE_36, reader);
        TokenStream ts = new LowerCaseFilter(Version.LUCENE_36, tokenizer);
        ts = new PorterStemFilter(ts);

        Set<String> stopwords = new HashSet<String>();
        stopwords.add("a");
        stopwords.add("in");
        ts = new StopFilter(Version.LUCENE_36, ts, stopwords);

        SynonymMap smap = null;
        try {
            SynonymMap.Builder sb = new SynonymMap.Builder(true);

            String base1 = "abinash";
            String syn1 = "abinasha";
            String syn11 = "abinashak";
            sb.add(new CharsRef(base1), new CharsRef(syn1), true);
            sb.add(new CharsRef(base1), new CharsRef(syn11), true);

            String base2 = "bangalor";
            String syn2 = "bangaloru";
            sb.add(new CharsRef(base2), new CharsRef(syn2), true);

            smap = sb.build();

        } catch (IOException ex) {
            ex.printStackTrace(System.err);
        }

        ts = new SynonymFilter(ts, smap, true);

        return ts;
    }

    public static void main(String[] args) throws Exception {
        Document doc = new Document();
        doc.add(new Field("description", "Abinash", Field.Store.NO, Field.Index.ANALYZED));
        Analyzer analyzer = new CustomAnalyzerExample();

        for (Fieldable field : doc.getFields()) {
            StringReader sr = new StringReader(field.stringValue());
            TokenStream stream = analyzer.tokenStream(field.name(), sr);
            CharTermAttribute termA = (CharTermAttribute) stream.getAttribute(CharTermAttribute.class);
            while (stream.incrementToken()) {
                System.out.println(termA.toString());
            }
            sr.close();
        }
    }
}