/**
* Check whether or not this fox is to give birth at this step. New births will be made into free
* adjacent locations.
*
* @param newFoxes A list to return newly born foxes.
*/
private void giveBirth(List<Animal> newFoxes) {
// New foxes are born into adjacent locations.
// Get a list of adjacent free locations.
Field field = getField();
List<Location> free = field.getFreeAdjacentLocations(getLocation());
int births = breed();
for (int b = 0; b < births && free.size() > 0; b++) {
Location loc = free.remove(0);
Fox young = new Fox(false, field, loc);
newFoxes.add(young);
}
}
/**
* Look for rabbits adjacent to the current location. Only the first live rabbit is eaten.
*
* @return Where food was found, or null if it wasn't.
*/
private Location findFood() {
Field field = getField();
List<Location> adjacent = field.adjacentLocations(getLocation());
Iterator<Location> it = adjacent.iterator();
while (it.hasNext()) {
Location where = it.next();
Object animal = field.getObjectAt(where);
if (animal instanceof Rabbit) {
Rabbit rabbit = (Rabbit) animal;
if (rabbit.isAlive()) {
rabbit.setDead();
foodLevel = RABBIT_FOOD_VALUE;
return where;
}
}
}
return null;
}