IController.java

package wmich.edu.cs1120.LA3_Lee;
import java.io.*;

public interface IController {
	
	/**
	 * Displays the collection of library items on the screen
	 */
	public void displayCollection();
	
	/**
	 * Requests for the call number from the user, uses the findItem()
	 * method to check if that item exists in the library, and if it does 
	 * calls the checkOut() method for that item and prints out the item 
	 * that has been checked out. 
	 */
	public void checkoutMaterials();
	
	/**
	 * Searches in both the array of books and the array of periodicals 
	 * for the book with the call number received as a parameter.
	 * @param callNum The call number of the item requested by the user
	 * @return The requested item, or 'null' if item does not exist.
	 */
	public ILibrary findItem(String callNum);
	
	/**
	 * Displays the menu options to the user.
	 */
	public void showMenu();
	
	/**
	 * Reads data from the input file and stores the items in the 
	 * appropriate array. 
	 * @param fileName The name of the input file.
	 * @throws IOException Included in case input file is not found.
	 */
	public void readInput(String fileName) throws IOException;
	
}	// End of interface IController