procedural-vs-OOP/src/main/java/de/hsfulda/pmuw/oop/CgolCell.java

package de.hsfulda.pmuw.oop;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;

public class CgolCell {
  private final StateChangeListener<CgolCell> listener;
  private CgolCell[] neighbors;
  private boolean isAlive, nextState;
  final int row, column;

  public CgolCell(int row, int column, boolean isAlive, StateChangeListener<CgolCell> listener) {
    super();
    this.row = row;
    this.column = column;
    this.isAlive = this.nextState = isAlive;
    this.listener = listener;
  }

  public boolean isAlive() {
    return isAlive;
  }

  public void setNeighbors(Set<CgolCell> neighbors) {
    this.neighbors = neighbors.toArray(new CgolCell[0]);
//    System.out.print(neighbors.stream().map(n -> String.format("(r%d-c%d %s)", n.row, n.column ,n.isAlive?"*":"-"))
//        .collect(Collectors.joining("", String.format("cell r%d-c%d:\n   ", row, column), "\n")));
  }

  void calculateNextGeneration() {
    int alifeNeigborsCount =0;
    for (CgolCell cgolCell : neighbors) {
      alifeNeigborsCount+= cgolCell.isAlive?1:0;
    }
    nextState = 3 == alifeNeigborsCount || (isAlive && (2 == alifeNeigborsCount));
  }

  void switchState() {
    if (isAlive || nextState) {
      for (CgolCell cgolCell : neighbors) {
        listener.addActiveCell(cgolCell);        
      }
      listener.addActiveCell(this);
    }
    isAlive = nextState;
  }

}