/** A test of the methods add, toArray, isEmpty, and getCurrentSize, 
    as defined in the first draft of the class LinkedBag.
    @author Frank M. Carrano
    @version 4.0
*/
public class LinkedBagDemo
{
	public static void main(String[] args) 
	{
      System.out.println("Creating an empty bag.");
      BagInterface<String> aBag = new LinkedBag<>();
      testIsEmpty(aBag, true);
		displayBag(aBag);
      
      String[] contentsOfBag = {"A", "D", "B", "A", "C", "A", "D"};
		testAdd(aBag, contentsOfBag);
		testIsEmpty(aBag, false);
	} // end main
   
   // Tests the method isEmpty.
   // Precondition: If the bag is empty, the parameter empty should be true;
   // otherwise, it should be false.
	private static void testIsEmpty(BagInterface<String> bag, boolean empty)
   {
      System.out.print("\nTesting isEmpty with ");
      if (empty)
         System.out.println("an empty bag:");
      else
         System.out.println("a bag that is not empty:");
      
      System.out.print("isEmpty finds the bag ");
      if (empty && bag.isEmpty())
			System.out.println("empty: OK.");
		else if (empty)
			System.out.println("not empty, but it is: ERROR.");
		else if (!empty && bag.isEmpty())
			System.out.println("empty, but it is not empty: ERROR.");
		else
			System.out.println("not empty: OK.");      
	} // end testIsEmpty
   // Tests the method add.
	private static void testAdd(BagInterface<String> aBag, String[] content)
	{
		System.out.print("Adding the following " + content.length +
                       " strings to the bag: ");
		for (int index = 0; index < content.length; index++)
		{
			if (aBag.add(content[index]))
            System.out.print(content[index] + " ");
         else
            System.out.print("\nUnable to add " + content[index] +
                             " to the bag.");
		} // end for
      System.out.println();
      
		displayBag(aBag);
	} // end testAdd
   
   // Tests the method toArray while displaying the bag.
	private static void displayBag(BagInterface<String> aBag)
	{
		System.out.println("The bag contains the following string(s):");
		Object[] bagArray = aBag.toArray();
		for (int index = 0; index < bagArray.length; index++)
		{
			System.out.print(bagArray[index] + " ");
		} // end for
		
		System.out.println();
	} // end displayBag
} // end LinkedBagDemo1
/*
 Creating an empty bag.
 
 Testing isEmpty with an empty bag:
 isEmpty finds the bag empty: OK.
 The bag contains the following string(s):
 
 Adding the following 7 strings to the bag: A D B A C A D
 The bag contains the following string(s):
 D A C A B D A
 
 Testing isEmpty with a bag that is not empty:
 isEmpty finds the bag not empty: OK.
*/