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BowlingKata/src/session2/BowlingScoreCalculator.java

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+package session2;
+
+public class BowlingScoreCalculator {
+
+	private int countFrames = 0;
+	private boolean firstRoll = true;
+	private int sum = 0;
+
+	public int calculateScore(String rolls) {
+		for (int rollIndex = 0; rollIndex < rolls.length() && countFrames < 10; rollIndex++) {
+			char roll = rolls.charAt(rollIndex);
+			if (rollIsStrike(roll)) {
+				handleStrike(rolls, rollIndex);
+			} else if (rollIsSpare(roll)) {
+				handleSpare(rolls, rollIndex);
+			} else {
+				handleRegularRoll(rolls, rollIndex);
+			}
+		}
+		return sum;
+	}
+
+	private void handleRegularRoll(String rolls, int i) {
+		sum += getValueForRolls(rolls, i);
+		if (firstRoll == true) {
+			firstRoll = false;
+		} else {
+			countFrames++;
+			firstRoll = true;
+		}
+	}
+
+	private void handleSpare(String rolls, int i) {
+		if (rolls.charAt(i - 1) != '-') {
+			sum -= getValueForRolls(rolls, i - 1);
+		}
+		sum += 10;
+		if (rolls.charAt(i + 1) != '-') {
+			sum += getValueForRolls(rolls, i + 1);
+		}
+		countFrames++;
+		firstRoll = true;
+	}
+
+	private boolean rollIsSpare(char roll) {
+		return roll == '/';
+	}
+
+	private boolean rollIsStrike(char roll) {
+		return roll == 'X';
+	}
+
+	private void handleStrike(String rolls, int i) {
+		sum += 10;
+		sum += getValueForRolls(rolls, i + 1);
+		sum += getValueForRolls(rolls, i + 2);
+		countFrames++;
+		firstRoll = true;
+	}
+
+	private int getValueForRolls(String rolls, int rollIndex) {
+		char roll = rolls.charAt(rollIndex);
+		if (rollIsStrike(roll)) {
+			return 10;
+		} else if (roll == '-') {
+			return 0;
+		} else {
+			return Integer.parseInt(roll + "");
+		}
+	}
+
+}