463 lines
18 KiB
Java
463 lines
18 KiB
Java
// Import all required libraries. Not using .* as it is not good practice due to potential conflicts.
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import java.util.List;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.Scanner;
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import java.util.Random;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.Date;
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import java.io.File;
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import java.io.IOException;
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import java.awt.FileDialog;
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import java.awt.Frame;
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import java.io.PrintWriter;
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/**
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* Class to create objects of a Library, which can hold and report on assets held within
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*
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* @author George Wilkinson
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* @version 3.0
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*/
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public class Library
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{
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// private List<LibraryItem> itemList; // Initialise an ArrayList of name itemList to store Library Items
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// private List<LibraryUser> userList; // Initialise an ArrayList of name userList to store Library Users
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/* No longer needed, as we can use the keys of customerMap.
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private HashSet<String> uuidSet; // Initialise a Hash Set of name uuidSet ( unique user identifier ) to store unique user IDs for efficient O(1) searching
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*/
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private Map<String, LibraryUser> customerMap;
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private Map<String, LibraryItem> itemsMap;
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private Map<String, LibraryReservation> libraryReservationMap;
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private Diary diary;
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/*
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* Constructor for objects of class Library
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*/
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public Library()
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{
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// itemList = new ArrayList<LibraryItem>();
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// userList = new ArrayList<LibraryUser>();
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/* No longer needed, can use keys of customerMap.
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uuidSet = new HashSet<String>();
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*/
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customerMap = new HashMap<String, LibraryUser>();
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itemsMap = new HashMap<String, LibraryItem>();
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libraryReservationMap = new HashMap<String, LibraryReservation>();
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diary = new Diary();
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}
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/**
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* Storing Objects Start
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*/
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/*
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* Inserts object value item alongside key of @itemCode into @itemsMap.
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*/
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private void storeItem( LibraryItem item )
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{
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// itemList.add( item );
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itemsMap.put( item.getItemCode(), item );
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}
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/*
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* Inserts object value user alongside key of @userID into @customerMap.
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* If the userID is set to unknown, it will call @generateUserID.
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*/
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private void storeUser( LibraryUser user )
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{
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// userList.add( user );
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if ( user.getUserID().equals( "unknown" ) )
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{
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user.setUserID( generateUserID( "AB-", 6 ) );
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}
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customerMap.put( user.getUserID(), user ); // Store the user along with the userID.
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}
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/*
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* Inserts object value reservation alongside key of @reservationNo into @libraryReservationMap.
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*/
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private void storeLibraryReservation( LibraryReservation reservation )
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{
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libraryReservationMap.put( reservation.getReservationNo(), reservation );
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diary.addReservation( reservation );
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}
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/**
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* Storing Objects End
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*/
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/**
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* Generate IDs Start
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*/
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/*
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* Generate a sequential reservation number. Since Maps do not have an index, we cannot simply get the last value,
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* and recursion would be too intensive for this application. As a placeholder for the file output, a field variable
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* is used to hold the last highest value for the reservation number. Unlike @generateUserID, this has a maximum value
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* hardcoded to the spec. This likely will not be an issue since we can still have 1,000,000 reservations.
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*/
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public String generateReservationNo()
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{
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/*
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* Originally, I did not check if the number was already taken, however the last part of step 4 introduced deletion.
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* When a reservation is deleted that does not have the highest reservation number, conflicting reservation numbers are generated.
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* e.g. 5 reservations, reservation 3 ID: 000003 is deleted. The next reservation number would be 000004, as the size + 1 = 4
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*/
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String candidateNo = String.format("%06d", libraryReservationMap.size() + 1);
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for ( int i = 1; libraryReservationMap.containsKey( candidateNo ); i++ )
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{
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candidateNo = String.format( "%06d", libraryReservationMap.size() + i );
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}
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return candidateNo;
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}
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/*
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* Returns a random unique user ID by specifying
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* @prefix - arbitrary alphanumeric prefix
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* @length - length of numeric ID
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* and returning a unique user id
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* @uuid - a unique string starting with @prefix, and concat. with a random number
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*
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* Example: length = 6, expected result should be under 999,999 and above 99,999.
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* If we just use 10^(length), this would generate any number under 1,000,000.
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* This is an issue since any integers below 100,000 can be used, which would be incorrect.
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* By using the offset of a factor of 10 below the desired length we can generate between 0 and 899,999.
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* After this, we can add 100,000 back to the number to ensure a baseline length is maintained.
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*
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* Note: I am aware that this is overengineered, and that several random integers of amount @length could be used,
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* but this is considerably more efficient since there is no iteration involved in the creation of the ID. O(1)
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*/
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private String generateUserID( String prefix, int length )
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{
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Random random = new Random();
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final int offset = (int) Math.pow( 10, (length-1) ); // Static integer equal to 10^(length-1) lower than length. This will allow for the factor to be consistent.
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int intLength = (int) ( Math.pow( 10, length ) ) - offset ; // Integer equal to 10^(length) minus the offset. This creates a ceiling for the ID range.
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if ( customerMap.size() == intLength ) {
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System.out.println("Too many user IDs delegated for current range, increasing ID range by a factor of 10");
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return generateUserID( prefix, length+1 );
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/*
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* This is essential for eliminating a stack overflow error when the specified range is full. This would be incorrect to catch.
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* By incrementing the length value when the ID range is full, roughly 2.1 billion users can be created without running into an overflow error.
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*/
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}
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String uuid = prefix + ( random.nextInt( intLength ) + offset );
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/*
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* Sets the uid to the prefix, concat. with a random integer of specified length
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* Add the offset to a random number, to create a floor to the ID range.
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*/
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if ( customerMap.containsKey( uuid ) ) // Previously uuidSet.contains, replaced to de-dupe held data.
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{
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generateUserID( prefix, length ); // If the ID generated is already contained in the hashset, the method should be called again.
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}
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/* No longer needed, as we add the user and the ID to the customerMap when storing.
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* uuidSet.add( uuid )
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*/
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return uuid;
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}
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/**
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* Generate IDs End
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*/
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/**
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* Print Object Details Start
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*/
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/*
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* Prints to the terminal, in a human-readable format, library reservation in the itemList
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*
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* Contains a marker at the start and end to visualise in terminal output.
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*/
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public void printLibraryReservations() {
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System.out.println( "Reservation Details Start" );
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for ( LibraryReservation reservation : libraryReservationMap.values() ){
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System.out.println("---------------");
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reservation.printDetails();
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}
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System.out.println( "---------------\nReservation Details End\n" );
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}
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/*
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* Prints to the terminal, in a human-readable format, all items in the itemList
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*
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* Contains a marker at the start and end to visualise in terminal output.
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*/
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public void printAll()
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{
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System.out.println("\n\nItem Details Start");
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for( LibraryItem item : itemsMap.values() )
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{
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System.out.println("---------------");
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item.printDetails();
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}
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System.out.println("---------------");
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System.out.println("Items Details End\n\n---------------\n\nUser Details Start\n");
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for ( LibraryUser user : customerMap.values() )
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{
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System.out.println("---------------");
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user.printDetails();
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}
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System.out.println("---------------\nUser Details End\n");
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printLibraryReservations();
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}
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public void printDiaryEntries( String start, String end )
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{
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diary.printEntries( DateUtil.convertStringToDate( start ), DateUtil.convertStringToDate( end ) );
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}
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/**
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* Print Object Details End
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*/
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/**
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* Write Files Start
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*/
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/*
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* Write all current library reservations to a file specified by the user.
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*/
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public void writeLibraryReservationData()
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{
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try {
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Frame frame = null; // Initialise null frame
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FileDialog fileBox = new FileDialog( frame, "Save", FileDialog.SAVE ); // Initialise file dialog box to save written data.
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fileBox.setVisible( true );
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PrintWriter writer = new PrintWriter( new File( fileBox.getDirectory() + fileBox.getFile() ) );
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for ( LibraryReservation reservation : libraryReservationMap.values() ) {
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reservation.writeData( writer );
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}
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writer.close();
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}
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catch( IOException e ) { // Catch any IO Exceptions that may occur from improper file selection.
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System.err.println( "Caught IOException: " + e.getMessage() + "\nAn I/O Exception has occurred, please check file is readable and correct format." );
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}
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}
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/*
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* A method to output all user data to a file using a fileDialog to specify file location.
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*
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*/
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public void writeUserData()
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{
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try {
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Frame frame = null; // Initialise null frame
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FileDialog fileBox = new FileDialog( frame, "Save", FileDialog.SAVE ); // Initialise file dialog box to save written data.
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fileBox.setVisible( true );
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PrintWriter writer = new PrintWriter( new File( fileBox.getDirectory() + fileBox.getFile() ) );
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// for ( LibraryUser user : userList ){
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writer.println("[Library User data]");
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for ( LibraryUser user : customerMap.values() ) {
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user.writeData( writer );
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}
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writer.close();
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}
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catch( IOException e ) { // Catch any IO Exceptions that may occur from improper file selection.
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System.err.println( "Caught IOException: " + e.getMessage() + "\nAn I/O Exception has occurred, please check file is readable and correct format." );
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}
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}
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/**
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* Write Files End
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*/
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/**
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* Read Files Start
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*/
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/*
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* Read Library Reservation Data from a file specified by the user.
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*/
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public void readLibraryReservationData()
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{
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try {
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Frame frame = null; // Initialise null frame
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FileDialog fileBox = new FileDialog( frame, "Load", FileDialog.LOAD ); // Initialise file dialog box to save written data.
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fileBox.setVisible( true );
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Scanner reservationScanner = new Scanner ( new File( fileBox.getDirectory() + fileBox.getFile() ) );
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while ( reservationScanner.hasNextLine() )
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{
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Scanner detailScanner = new Scanner( reservationScanner.nextLine() ).useDelimiter(",");
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LibraryReservation reservation = new LibraryReservation();
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reservation.readData( detailScanner );
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storeLibraryReservation( reservation );
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detailScanner.close();
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}
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reservationScanner.close(); // Close Scanner
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}
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catch( IOException e ) { // Catch any IO Exceptions that may occur from improper file selection.
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System.err.println( "Caught IOException: " + e.getMessage() + "\nAn I/O Exception has occurred, please check file is readable and correct format." );
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}
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}
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/*
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* A method to read all data from files using a fileDialog to specify file location.
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* This will create the corresponding objects depending on flags contained in the file
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* and populate it's fields.
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*
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* Default flag value: "book", to support legacy files. This will not interfere with
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* files of different flag orders.
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*/
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public void readData()
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{
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Frame frame = null; // Initialise a null frame
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FileDialog fileBox = new FileDialog( frame, "Open", FileDialog.LOAD ); // Initialise filebox with the null frame pointer
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fileBox.setVisible( true ); // Open a file selection dialog to the user.
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try {
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Scanner fileScanner = new Scanner( new File( fileBox.getDirectory() + fileBox.getFile() ) );
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String typeFlag = "book"; // Set a default flag to support legacy files.
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while( fileScanner.hasNextLine() ) {
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String lineItem = fileScanner.nextLine();
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// Ensure no comments or empty lines are included
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if ( lineItem.contains( "//" ) || lineItem.trim().isEmpty() ){}
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// Check current line is a candidate flag
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else if ( lineItem.startsWith("[" ) ) {
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if ( lineItem.toLowerCase().contains("book") )
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typeFlag = "book";
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else if ( lineItem.toLowerCase().contains("periodical") )
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typeFlag = "periodical";
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else if ( lineItem.toLowerCase().contains("cd") )
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typeFlag = "cd";
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else if ( lineItem.toLowerCase().contains("dvd") )
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typeFlag = "dvd";
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else if ( lineItem.toLowerCase().contains("user") )
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typeFlag = "user";
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else {
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System.out.println( "Flag detected, but no accepted format...\n Cannot store item in Library. Changing Flag to generic and skipping the following: ");
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typeFlag = "generic";
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}
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}
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// Unfortunately cannot use switch case with string comparisons in Java 8.
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// Check current flag for data processing.
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else {
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Scanner detailScanner = new Scanner ( lineItem ).useDelimiter(","); // Create a new scanner to grab the values in a comma separated list
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LibraryItem item = null; // Initialise LibraryItem object. Java compiler was being cautious here, so I have to assign the value null.
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if ( typeFlag.equals( "book" ) ) {
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// Process Book Data
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item = new Book();
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}
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else if ( typeFlag.equals( "periodical" ) ) {
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// Process Periodic Data
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item = new Periodical();
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}
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else if ( typeFlag.equals( "cd" ) ) {
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//Process CD Data
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item = new CD();
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}
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else if ( typeFlag.equals( "dvd" ) ) {
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//Process DVD Data
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item = new DVD();
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}
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else if ( typeFlag.equals( "user" ) ) {
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//Process User Data
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LibraryUser user = new LibraryUser();
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user.readData( detailScanner );
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storeUser( user );
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continue;
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}
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else if ( typeFlag.equals( "generic" ) ) {
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// Output unaccepted lines to terminal
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System.out.println( lineItem );
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continue;
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}
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item.readItemData( detailScanner );
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storeItem( item );
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detailScanner.close();
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}
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}
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fileScanner.close();
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}
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catch( IOException e ) { // Catch any IO Exceptions that may occur from improper file selection.
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System.err.println( "Caught IOException: " + e.getMessage() + "\nAn I/O Exception has occurred, please check file is readable and correct format." );
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}
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}
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/**
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* Read Files End
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*/
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/**
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* Other Methods
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*/
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/*
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* Create a reservation to allow a user to reserve an item from the library.
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*/
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public boolean makeLibraryReservation( String userID, String itemCode, String startDate, int noOfDays )
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{
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if ( !customerMap.containsKey( userID ) )
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{
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System.out.println( "User does not exist" );
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return false;
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}
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if ( !itemsMap.containsKey( itemCode ) )
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{
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System.out.println( "Item does not exist in library" );
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return false;
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}
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if ( !DateUtil.isValidDateString( startDate ) )
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{
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System.out.println( "Date is not valid" );
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return false;
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}
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if ( !(noOfDays > 0) )
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{
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System.out.println( "Reservation must be more than 0 days" );
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return false;
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}
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Date start = DateUtil.convertStringToDate( startDate );
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/*
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* Unneeded, since addReservations returns any item currently on loan. Dates do not need to be checked for every day in loan.
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* Date end = DateUtil.incrementDate( start, noOfDays-1 );
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*/
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String rID = generateReservationNo();
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LibraryReservation reservation = new LibraryReservation( rID, itemCode, userID, startDate, noOfDays );
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/** Instead of the following For loop, I could've implemented
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* Arrays.asList( diary.getReservation( start, end ).contains( reservation )
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* Although this would've been easier, this implementation is more in the scope of what we have learned.
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**/
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for ( LibraryReservation diaryReservation : diary.getReservations( start ) )
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{
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if ( diaryReservation.toString().equals( reservation.toString() ) )
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{
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return false;
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}
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}
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storeLibraryReservation( reservation );
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return true;
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}
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public void deleteLibraryReservation( String reservationNo )
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{
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if ( libraryReservationMap.containsKey( reservationNo ) )
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{
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diary.deleteReservation( libraryReservationMap.get( reservationNo ) );
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libraryReservationMap.remove( reservationNo );
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}
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}
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}
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