VS_LET/09-cloud/src/main/java/vs/BallotBox.java

package vs;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class BallotBox {
	private Map<String, Integer> votes = new HashMap<>();

	public synchronized void vote(String choice) {
		Integer votes = this.votes.get(choice);
		if (votes == null) {
			votes = 0;
		}
		this.votes.put(choice, votes + 1);
	}

	public synchronized int countVotes() {
		int sum = 0;
		for (Map.Entry<String, Integer> choice : this.votes.entrySet()) {
			sum += choice.getValue();
		}
		return sum;
	}

	public synchronized int getNumberOfVotes(String choice) {
		Integer votes = this.votes.get(choice);
		if (votes == null) {
			votes = 0;
		}
		return votes;
	}

	public synchronized Set<String> getChoices() {
		return this.votes.keySet();
	}
}