/**
* Look for foxes and wolfs adjacent to the current location. Only the first live foxes or wolf 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 Wolf) {
Wolf wolf = (Wolf) animal;
if (wolf.isAlive()) {
wolf.setDead();
setFoodLevel(WOLFS_FOOD_VALUE);
return where;
}
} else if (animal instanceof Fox) {
Fox fox = (Fox) animal;
if (fox.isAlive()) {
fox.setDead();
setFoodLevel(FOX_FOOD_VALUE);
return where;
}
} else if (animal instanceof Rabbit) {
Rabbit rabbit = (Rabbit) animal;
if (rabbit.isAlive()) {
rabbit.setDead();
setFoodLevel(RABBIT_FOOD_VALUE);
return where;
}
}
}
return null;
}
/**
* Check whether or not this bear is to give birth at this step. New births will be made into free
* adjacent locations.
*
* @param newbearrs A list to return newly born bears.
*/
private void giveBirth(List<Actor> newBears) {
// New bears 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);
Bear young = new Bear(false, field, loc);
newBears.add(young);
}
}