de.catma.indexer.WildcardTermExtractor.java Source code

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Here is the source code for de.catma.indexer.WildcardTermExtractor.java

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/*   
 *   CATMA Computer Aided Text Markup and Analysis
 *   
 *   Copyright (C) 2009-2013  University Of Hamburg
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.catma.indexer;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.OffsetAttribute;

import de.catma.indexer.wildcardparser.WildcardParser;

public class WildcardTermExtractor {

    private List<String> orderedTerms;

    public WildcardTermExtractor(String content, List<String> unseparableCharacterSequences,
            List<Character> userDefinedSeparatingCharacters, Locale locale) throws IOException {
        extractTermInfosWithWildcards(content, unseparableCharacterSequences, userDefinedSeparatingCharacters,
                locale);
    }

    private void extractTermInfosWithWildcards(String content, List<String> unseparableCharacterSequences,
            List<Character> userDefinedSeparatingCharacters, Locale locale) throws IOException {

        if (locale == null) {
            locale = Locale.getDefault();
        }

        WhitespaceAndPunctuationAnalyzer analyzer = new WhitespaceAndPunctuationAnalyzer(
                unseparableCharacterSequences, userDefinedSeparatingCharacters, locale);

        TokenStream ts = analyzer.tokenStream(null, // our analyzer does not use
                // the fieldname
                new StringReader(content));

        WildcardParser wildcardParser = new WildcardParser();
        while (ts.incrementToken()) {
            CharTermAttribute termAttr = (CharTermAttribute) ts.getAttribute(CharTermAttribute.class);

            OffsetAttribute offsetAttr = (OffsetAttribute) ts.getAttribute(OffsetAttribute.class);
            wildcardParser.handle(termAttr, offsetAttr);
        }
        wildcardParser.finish();

        orderedTerms = new ArrayList<String>();
        for (TermInfo ti : wildcardParser.getOrderedTermInfos()) {
            orderedTerms.add(ti.getTerm());
        }

    }

    public List<String> getOrderedTerms() {
        return orderedTerms;
    }

}