ContinuousIntegration/TDD-Mocking/src/main/java/de/edu/hsfulda/ciip/tdd/StateAlive.java

package de.edu.hsfulda.ciip.tdd;

import java.util.List;

public class StateAlive implements State {

	@Override
	public State nextBy(List<State> neigborStates) {
		long alifeNeigbors = countAliveNeighbors(neigborStates);
		if(alifeNeigbors >1) {
			return this;
		} else {
			return new StateDead();
		}
	}
	
	private long countAliveNeighbors(List<State> neigborStates) {
		return neigborStates.stream().filter(state -> this == state).count();
	}
	
}