CorrectionFour.java

package org.c3sl.ufpr.br.correction;

import br.ufpr.c3sl.mistakes.MistakeOccurrence;
import br.ufpr.c3sl.virtualkeyboard.mathevaluator.MathEvaluator;

public class CorrectionFour extends AbstractCorrection{

	public CorrectionFour() {
		super(4);
	}

	private static final long serialVersionUID = -284173720939128612L;

	@Override
	public boolean isCorrect(String answer, int row, int column) {
		MathEvaluator math = new MathEvaluator();
		math.addVariable("ℓ", 311.43);
		math.addVariable("n", 0.8);
		math.setExpression(answer);

		answerDouble = math.getValue();

		String expression = "";
		
		switch (column) {
		case 2:
			if (row < 5)
				expression = "ℓ/2^"+row;
			else 
				expression = "ℓ/ ( 2 ^ n )";
			break;
		case 3:
			if (row < 5)
				expression = " ( ( ( ℓ/2^" + row + " ) ^ 2 ) * sqrt ( 3 ) ) / 4 ";
			else 
				expression = " ( ( ( ℓ/ (2 ^ n)  ) ^ 2 ) * sqrt ( 3 ) ) / 4 ";
			break;
		case 4:
			if (row < 5)
				expression = " 3 ^ " + row;
			else 
				expression = " 3 ^ n";
			break;
		case 5:
			if (row < 5)
				expression = " 3 ^ " + row + " * ( ( ( ℓ/2^" + row + " ) ^ 2 ) * sqrt ( 3 ) ) / 4 ";
			else 
				expression = " (3 ^ n)  * ( ( ( ℓ/ (2 ^ n)  ) ^ 2 ) * sqrt ( 3 ) ) / 4 ";
			break;
		default:
			break;
		}
		
		math.setExpression(expression);

		correctAnswer = math.getValue();

		int comparationReturn = super.compareDouble(correctAnswer, answerDouble, 0.009);

		switch (comparationReturn) {
		case 1:
			this.message = null;
			saveHit(answer, expression, row, column);
			return true;
		case -1:
			if (column != 4)
			this.message = MistakeOccurrence.getMistakeMessage("4", 3, Integer.parseInt(row+""+column));
			saveState(answer, expression, row, column);
			return false;
		case -2:
			if (column != 4)
			this.message = MistakeOccurrence.getMistakeMessage("4", 3, Integer.parseInt(row+""+column));
			saveState(answer, expression, row, column);	
			return false;
		default:
			this.message = null;
			return false;
		}
	}
}