/// <summary>
/// returns the first of specified type in the queue
/// if none of specified type, returns null
/// if invalid type, returns null and reports invalid on console
/// </summary>
/// <param name="pref"> type of animal requested </param>
/// <returns> found animal or null </returns>
public Animal Dequeue(string pref)
{
Animal temp = null;
if (pref == "")
{
return(Primary.Dequeue());
}
if (pref != "dog" && pref != "cat")
{
Console.WriteLine($"This shelter doesn't house {pref}s.");
return(temp);
}
temp = Primary.Dequeue();
while (Primary.Front != null && temp.Species != pref)
{
Helper.Enqueue(temp);
temp = Primary.Dequeue();
}
while (Primary.Front != null)
{
Helper.Enqueue(Primary.Dequeue());
}
Queue hold;
hold = Primary;
Primary = Helper;
Helper = hold;
return(temp);
}
public Animal Dequeue(string pref)
{
Animal temp = null;
if (pref == "")
{
return(Primary.Dequeue());
}
if (pref != "dog" && pref != "cat")
{
Console.WriteLine("This animal does not exist");
return(temp);
}
temp = Primary.Dequeue();
// Checking to see if there is a match, if not send to secondary queue
// If the primary has anything left in it after finding a match go ahead and send the rest to the second queue
while (Primary.Front != null && temp.Species != pref)
{
Secondary.Enqueue(temp);
temp = Primary.Dequeue();
}
while (Primary.Front != null)
{
Secondary.Enqueue(Primary.Dequeue());
}
Queue temp2;
temp2 = Primary;
Primary = Secondary;
Secondary = temp2;
return(temp);
}
