diff options
Diffstat (limited to 'oop/11-point-of-sale/src/main/java/lk/ac')
12 files changed, 523 insertions, 0 deletions
diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/App.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/App.java new file mode 100644 index 0000000..c646f5e --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/App.java @@ -0,0 +1,24 @@ +package lk.ac.pdn.ceit.pos; + +import lk.ac.pdn.ceit.pos.ui.TextUI; + +/** + * Hello world! + */ +public class App { + public static void main(String[] args) { + // Create an ItemManager + ItemManager itemManager = new ItemManagerImpl(); + + // Create a BillManager + BillManager billManager = new BillManagerImpl(itemManager); + + // Create a POS + PointOfSale pos = new PointOfSaleImpl(itemManager, billManager); + + TextUI ui = new TextUI(); + ui.setPos(pos); + + ui.start(); + } +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManager.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManager.java new file mode 100644 index 0000000..7ac0e53 --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManager.java @@ -0,0 +1,16 @@ +package lk.ac.pdn.ceit.pos; + +import lk.ac.pdn.ceit.pos.entities.Bill; + +public interface BillManager { + public Bill createNewBill(); + + /** + * End the current bill. + */ + public void saveBill(); + + public void addLineItem(String itemId, int quantity); + + public void finishBillSession(); +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManagerImpl.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManagerImpl.java new file mode 100644 index 0000000..11f7889 --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/BillManagerImpl.java @@ -0,0 +1,52 @@ +package lk.ac.pdn.ceit.pos; + +import lk.ac.pdn.ceit.pos.entities.Bill; +import lk.ac.pdn.ceit.pos.entities.Item; +import lk.ac.pdn.ceit.pos.entities.LineItem; + +public class BillManagerImpl implements BillManager { + private ItemManager itemManager; + + private Bill currentBill; + + // Just for demo purpose. In real world, a database call may be used for this purpose. + private int lastBillId = 0; + + public BillManagerImpl(ItemManager itemManager) { + this.itemManager = itemManager; + } + + @Override + public Bill createNewBill() { + currentBill = new Bill(); + + lastBillId++; + currentBill.setId(lastBillId); + + return currentBill; + } + + @Override + public void addLineItem(String itemId, int quantity) { + if (currentBill == null) { + throw new IllegalStateException("A bill has not been created so far. Neither a checked exception is thrown."); + } + + Item item = itemManager.findById(itemId); + + if (item != null) { + LineItem lineItem = new LineItem(item.getId(), item.getName(), quantity, item.getUnitPrice()); + currentBill.addLineItem(lineItem); + } + } + + @Override + public void saveBill() { + // TODO: Save the currentBill in DB. + } + + @Override + public void finishBillSession() { + currentBill = null; + } +}
\ No newline at end of file diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManager.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManager.java new file mode 100644 index 0000000..3e31fdc --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManager.java @@ -0,0 +1,12 @@ +package lk.ac.pdn.ceit.pos; + +import java.math.BigDecimal; +import java.util.List; + +import lk.ac.pdn.ceit.pos.entities.Item; + +public interface ItemManager { + public Item createItem(String id, String name, BigDecimal unitPrice); + public Item findById(String id); + public List<Item> searchItems(String q); +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManagerImpl.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManagerImpl.java new file mode 100644 index 0000000..ae325cd --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ItemManagerImpl.java @@ -0,0 +1,47 @@ +package lk.ac.pdn.ceit.pos; + +import java.math.BigDecimal; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import lk.ac.pdn.ceit.pos.entities.Item; + +public class ItemManagerImpl implements ItemManager { + + // For this demo. let's hold Items in memory. + private Map<String, Item> items = new HashMap<>(); + + public ItemManagerImpl() { + // For demo purposes, let's create some items (to be availalbe in system db) + createItem("F001", "Red Lentil (Dhal)", new BigDecimal("250.00")); + createItem("F002", "Sugar", new BigDecimal("270.00")); + createItem("S001", "Beauty Soap", new BigDecimal("165.00")); + } + + @Override + public Item createItem(String id, String name, BigDecimal unitPrice) { + Item item = new Item(id, name, unitPrice); + items.put(id, item); + return item; + } + + @Override + public Item findById(String id) { + return items.get(id); + } + + @Override + public List<Item> searchItems(String q) { + List<Item> results = new ArrayList<>(); + + for (Item item : items.values()) { + if (item.getName().toLowerCase().contains(q.toLowerCase())) { + results.add(item); + } + } + + return results; + } +}
\ No newline at end of file diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSale.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSale.java new file mode 100644 index 0000000..d318af0 --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSale.java @@ -0,0 +1,15 @@ +package lk.ac.pdn.ceit.pos; + +import java.util.List; + +import lk.ac.pdn.ceit.pos.entities.Bill; +import lk.ac.pdn.ceit.pos.entities.Item; + +public interface PointOfSale { + public Bill createNewBill(); + public void addLineItem(String itemId, int quantity); + public void cashByCustomer(String amount); + public List<Item> searchItems(String q); + public void saveBill(); + public void finishBillSession(); +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSaleImpl.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSaleImpl.java new file mode 100644 index 0000000..b4d697d --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/PointOfSaleImpl.java @@ -0,0 +1,49 @@ +package lk.ac.pdn.ceit.pos; + +import java.util.List; + +import lk.ac.pdn.ceit.pos.entities.Bill; +import lk.ac.pdn.ceit.pos.entities.Item; + +public class PointOfSaleImpl implements PointOfSale { + + private ItemManager itemManager; + private BillManager billManager; + + public PointOfSaleImpl(ItemManager itemManager, BillManager billManager) { + this.itemManager = itemManager; + this.billManager = billManager; + } + + @Override + public Bill createNewBill() { + return billManager.createNewBill(); + } + + @Override + public void addLineItem(String itemId, int quantity) { + billManager.addLineItem(itemId, quantity); + } + + @Override + public void cashByCustomer(String amount) { + // TODO Auto-generated method stub + throw new UnsupportedOperationException("Unimplemented method 'cashByCustomer'"); + } + + @Override + public List<Item> searchItems(String q) { + return itemManager.searchItems(q); + } + + @Override + public void saveBill() { + billManager.saveBill(); + } + + @Override + public void finishBillSession() { + billManager.finishBillSession(); + } + +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Bill.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Bill.java new file mode 100644 index 0000000..c78f88b --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Bill.java @@ -0,0 +1,79 @@ +package lk.ac.pdn.ceit.pos.entities; + +import java.math.BigDecimal; +import java.util.ArrayList; +import java.util.List; + +public class Bill { + + private List<LineItem> lineItems = new ArrayList<>(); + private Cashier cashier; + + private int id; + private BigDecimal total = new BigDecimal("0.00"); + private BigDecimal tax; + private BigDecimal cashByCustomer; + private BigDecimal balance; + + public Bill() { + } + + public Cashier getCashier() { + return cashier; + } + + public void setCashier(Cashier cashier) { + this.cashier = cashier; + } + + public int getId() { + return id; + } + public void setId(int id) { + this.id = id; + } + + public BigDecimal getTotal() { + return total; + } + + public BigDecimal getTax() { + return tax; + } + + public void setTax(BigDecimal tax) { + this.tax = tax; + } + + public BigDecimal getCashByCustomer() { + return cashByCustomer; + } + public void setCashByCustomer(BigDecimal cashByCustomer) { + this.cashByCustomer = cashByCustomer; + } + + public BigDecimal getBalance() { + return balance; + } + + @Override + public String toString() { + return "Bill [id=" + id + ", total=" + total + ", tax=" + tax + ", cashByCustomer=" + cashByCustomer + + ", balance=" + balance + "]"; + } + + public void addLineItem(LineItem lineItem) { + lineItems.add(lineItem); + + // Update total + for (LineItem _lineItem : lineItems) { + total = total.add(_lineItem.getUnitPrice().multiply(BigDecimal.valueOf(_lineItem.getQuantity()))); + } + } + + public List<LineItem> getLineItems() { + // TODO: Do a deep copy and return to avoid external modification of line items. + // We return an immutable copy to avoid external world adding LineItems. + return List.copyOf(lineItems); + } +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Cashier.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Cashier.java new file mode 100644 index 0000000..f951a9c --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Cashier.java @@ -0,0 +1,31 @@ +package lk.ac.pdn.ceit.pos.entities; + +public class Cashier { + private String id; + private String name; + + public Cashier() { + } + + public Cashier(String id, String name) { + this.id = id; + this.name = name; + } + + public String getId() { + return id; + } + + public void setId(String id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Item.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Item.java new file mode 100644 index 0000000..ecf6bea --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/Item.java @@ -0,0 +1,43 @@ +package lk.ac.pdn.ceit.pos.entities; + +import java.math.BigDecimal; + +public class Item { + private String id; + private String name; + private BigDecimal unitPrice; + + public Item() { + } + + public Item(String id, String name, BigDecimal unitPrice) { + this.id = id; + this.name = name; + this.unitPrice = unitPrice; + } + + public String getId() { + return id; + } + public void setId(String id) { + this.id = id; + } + public String getName() { + return name; + } + public void setName(String name) { + this.name = name; + } + public BigDecimal getUnitPrice() { + return unitPrice; + } + public void setUnitPrice(BigDecimal unitPrice) { + this.unitPrice = unitPrice; + } + + @Override + public String toString() { + return "Item [id=" + id + ", name=" + name + ", unitPrice=" + unitPrice + "]"; + } + +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/LineItem.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/LineItem.java new file mode 100644 index 0000000..8c53ec4 --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/entities/LineItem.java @@ -0,0 +1,53 @@ +package lk.ac.pdn.ceit.pos.entities; + +import java.math.BigDecimal; + +public class LineItem { + + private String itemId; + private String itemName; + private int quantity; + private BigDecimal unitPrice; + + public LineItem() { + } + + public LineItem(String itemId, String itemName, int quantity, BigDecimal unitPrice) { + this.itemId = itemId; + this.itemName = itemName; + this.quantity = quantity; + this.unitPrice = unitPrice; + } + + public String getItemId() { + return itemId; + } + public void setItemId(String itemId) { + this.itemId = itemId; + } + public String getItemName() { + return itemName; + } + public void setItemName(String itemName) { + this.itemName = itemName; + } + public int getQuantity() { + return quantity; + } + public void setQuantity(int quantity) { + this.quantity = quantity; + } + public BigDecimal getUnitPrice() { + return unitPrice; + } + public void setUnitPrice(BigDecimal unitPrice) { + this.unitPrice = unitPrice; + } + + @Override + public String toString() { + return "LineItem [itemId=" + itemId + ", itemName=" + itemName + ", quantity=" + quantity + ", unitPrice=" + + unitPrice + "]"; + } + +} diff --git a/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ui/TextUI.java b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ui/TextUI.java new file mode 100644 index 0000000..874c074 --- /dev/null +++ b/oop/11-point-of-sale/src/main/java/lk/ac/pdn/ceit/pos/ui/TextUI.java @@ -0,0 +1,102 @@ +package lk.ac.pdn.ceit.pos.ui; + +import java.util.List; + +import lk.ac.pdn.ceit.pos.PointOfSale; +import lk.ac.pdn.ceit.pos.entities.Bill; +import lk.ac.pdn.ceit.pos.entities.Item; +import lk.ac.pdn.ceit.pos.entities.LineItem; + +public class TextUI { + private PointOfSale pos; + private Bill bill; // Current bill + + private void printBill() { + // Print top part of the bill + IO.println(bill); // TODO: Only print suitable parts for the top of the bill. + + // Print line items + for (LineItem lineItem : bill.getLineItems()) { + IO.println(lineItem); + } + + // TODO: Print total, cash given, balance, etc. + } + + public void setPos(PointOfSale pos) { + this.pos = pos; + } + + public void start() { + IO.println("POS Starting..."); + printHelp(); + + while (true) { + String response = IO.readln("POS> "); + + switch (response.trim().toLowerCase()) { + case "q": + case "quit": + IO.println("Bye bye!"); + System.exit(0); + + case "help": + printHelp(); + break; + + case "create": + bill = pos.createNewBill(); + IO.println("New bill created. Bill id: " + bill.getId()); + break; + + case "search": + String q = IO.readln("Enter search query (item name): "); + List<Item> items = pos.searchItems(q); + + IO.println("Search results: "); + + for (Item item : items) { + IO.println(item); + } + break; + + case "item": + String itemId = IO.readln("Enter item Id: "); + String quantity = IO.readln("Enter quantity: "); + pos.addLineItem(itemId, Integer.parseInt(quantity)); + break; + + case "save": + pos.saveBill(); + IO.println("Bill saved."); + break; + + case "finish": + pos.finishBillSession(); + this.bill = null; + IO.println("Bill session finished."); + break; + + case "print": + printBill(); + break; + + default: + IO.println("Command not understood."); + break; + } + + } + } + + private void printHelp() { + IO.println("Commands available:"); + IO.println(" q or quit - Quit the program."); + IO.println(" help - Prints this help."); + IO.println(" create - Create a new bill."); + IO.println(" item - Enter new item details to be purchased."); + IO.println(" save - Save the current bill in the system."); + IO.println(" print - Print the bill."); + IO.println(" finish - Finish current bill session."); + } +}
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