package exercise.fill_blank;

import java.io.*;
import java.util.*;
import exercise.*;

public class FBExerciseModel extends ExerciseModel {
    protected int		numBlanks;

    public FBExerciseModel(String id, String prompt, int numBlanks) {
	super(id, prompt);
	this.numBlanks = numBlanks;
    }

    public int getNumBlanks() { return numBlanks; }

    public static FBExerciseModel load(String path) throws IOException {
	String line;

	// Read the document into a buffer.
	Class cl = FBExerciseModel.class;
	InputStream is = cl.getResourceAsStream(path);
	InputStreamReader isr = new InputStreamReader(is);
	BufferedReader br = new BufferedReader(isr);
	Vector docBuffer = new Vector();
	while ((line = br.readLine()) != null) { docBuffer.add(line); }
	br.close();

	// Read the id from the buffer.
	String id = (String)docBuffer.get(2);

	// Read the prompt from the buffer.
	StringBuffer promptBuffer = new StringBuffer();
	int index = 5;
	while ((line = (String)docBuffer.get(index++)) != "</prompt>") {
	    promptBuffer.append(line + "\n");
	}
	String prompt = promptBuffer.toString();

	// Read the number of blanks from the buffer.
	line = (String)docBuffer.get(index + 1);
	int numBlanks = Integer.parseInt(line);

	// Return an Exercise object.
	return new FBExerciseModel(id, prompt, numBlanks);
    }
}