LUTRead.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;

/**
 * This class matches stroke recognition results to character
 * Assumes existence of "LUTforward.dat" and "LUTback.dat" files in project directory
 * TODO - Edit-distance for user-corrections
 * @author aruni
 *
 */

public class LUTRead {
	
	public static void main(String[] args) throws IOException, ClassNotFoundException 
	{
		//Reading in the LUT from file to HashMap 
		ObjectInputStream oin = new ObjectInputStream(new FileInputStream(new File("LUTforward.dat")));
		HashMap<String,String> LUTforward = (HashMap<String, String>) oin.readObject();
		
		System.out.println(LUTforward);
		
		//Creating object with LUT for character recognition
		CharLUT Lut = new CharLUT(LUTforward);
		
		//ArrayList to store the recognised strokes
		ArrayList<String> stroke_str = new ArrayList<String>();
		
		/*
		 * Simulating the stroke recognition portion as user input from console
		 */
		System.out.println("Enter stroke sequence. Enter -1 to exit.");
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String read=br.readLine();
		while(!read.equals("-1"))
		{
			stroke_str.add(read);
			read=br.readLine();
		}
		String char_class = Lut.getValue(stroke_str);
		System.out.println("Character class: "+ char_class + " for strokes: " + stroke_str.toString());
		
		oin.close();
	}
	
}

class CharLUT
{
	HashMap<String,String> LUTforward;
	String strokeSeq;
	String charClass;
	String correctedCharClass;
	String correctedStrokeSeq;
	
	/**
	 * public constructor of class CharLUT
	 * @param HashMap<String,String> LUTfwd
	 */
	public CharLUT(HashMap<String,String> LUTfwd)
	{
		LUTforward = LUTfwd;
	}
	
	/**
	 * Overloaded function
	 * @param ArrayList<String> stroke_seq
	 * @return String character class
	 */
	public String getValue(ArrayList<String> stroke_seq)
	{
		Collections.sort(stroke_seq);
		String arr = (String) stroke_seq.toString();
		String key_string = arr.replaceAll("(^\\[|\\]$)", "").replace(", ", " ");
		strokeSeq = key_string;
		charClass = LUTforward.get(key_string);
		return charClass;
	}
	
	/**
	 * Overloaded function
	 * @param String stroke_seq
	 * @return String character class
	 */
	public String getValue(String stroke_seq)
	{
		strokeSeq = stroke_seq;
		charClass = LUTforward.get(stroke_seq);
		return charClass;
	}
	
	/**
	 * @param String correctCharClass from user's correction
	 * @return String character class
	 */
	public void setCorrectCharClass(String correctClass)
	{
		correctedCharClass = correctClass;
	}
	
}