IOB2DataReader.java

/*
 Copyright (C) 2010 by
 * 
 * 	Cam-Tu Nguyen 
 *  ncamtu@ecei.tohoku.ac.jp or ncamtu@gmail.com
 *
 *  Xuan-Hieu Phan  
 *  pxhieu@gmail.com 
 *
 *  College of Technology, Vietnamese University, Hanoi
 * 	Graduate School of Information Sciences, Tohoku University
 *
 * JVnTextPro-v.2.0 is a 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 2 of the License,
 * or (at your option) any later version.
 *
 * JVnTextPro-v.2.0 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  JVnTextPro-v.2.0); if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 */
package jvnsegmenter;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import jvntextpro.data.DataReader;
import jvntextpro.data.Sentence;
import jvntextpro.data.TWord;

// TODO: Auto-generated Javadoc
// TODO: Read data in IOB2 format which is the same as training data provided 
// in the previous version of JVnSegmenter (v.1.0)
/**
 * The Class IOB2DataReader.
 */
public class IOB2DataReader extends DataReader {

	/* (non-Javadoc)
	 * @see jvntextpro.data.DataReader#readFile(java.lang.String)
	 */
	@Override
	public List<Sentence> readFile(String datafile) {
		// TODO Auto-generated method stub
		// read all data into a data string
		String dataStr = "";
		try{
			BufferedReader in = new BufferedReader(new InputStreamReader(
					new FileInputStream(datafile), "UTF-8"));
			String line;
			int count = 0;
			while ((line = in.readLine()) != null){
				System.out.println("Line " + count++);
				dataStr += line + "\n";
			}
			in.close();			
		}
		catch (Exception e){
			System.out.println(e.getMessage());
			return null;
		}
		return readString(dataStr);
	}

	/* (non-Javadoc)
	 * @see jvntextpro.data.DataReader#readString(java.lang.String)
	 */
	@Override
	public List<Sentence> readString(String dataStr) {
		// TODO Auto-generated method stub
		dataStr = dataStr + "$";
		String  [] lines = dataStr.split("\\n");
		
		List<Sentence> data = new ArrayList<Sentence>();
		Sentence sent = new Sentence();
		for (String line : lines){
			System.out.println(".");
			if (line.isEmpty() || line.equalsIgnoreCase("$")){								
				data.add(sent);
				sent = new Sentence();				
			}
			else{
				StringTokenizer tk = new StringTokenizer(line, "\t");
				if (tk.countTokens() != 2) continue;
				else {
					String token = tk.nextToken();
					String tag = tk.nextToken();
					TWord tw = new TWord(token, tag);
					sent.addTWord(tw);
				}
			}
		}
		return data;
	}

}