updated receipt handling

src/main/java/tech/iBeans/POSware/Lite/receipt.java

@@ -12,11 +12,66 @@ import tech.iBeans.POSware.Lite.data_test.*;
  */
 public class receipt {
     public static String content = "";
+	private static Dictionary<String, String> data = new Hashtable<>();
     
     public static void init() {
         content = "";
+		data.put("headers", "");
+		data.put("cart", "");
+		data.put("payment", "");
+		data.put("footer", "");
     };
+	
+	public static String create() {
+		/* This is different from an initialization or reset — this alsof adds the headers! 
+			
+			Returns: (String) the content
+		*/
+			
+		init();
+		headers();
+		
+		return(content);
+	};
     
+	private static String ready() {
+		/* Prepare for a new data entry. 
+			
+			Returns: (String) the updated receipt
+		*/
+			
+		content = content.concat("\n\n");
+		
+		return(content);
+	};
+	
+	public static String refresh() {
+		/* Refresh the receipt's content. 
+				Returns: (string) the updated conntent
+		*/
+		
+		content = "";
+		
+		if (data.get("headers") != null) {
+			content = content.concat(data.get("headers").toString());
+			ready();
+		};
+		if (data.get("cart") != null) {
+			content = content.concat(data.get("cart").toString());
+			ready();
+		};
+		if (data.get("payment") != null) {
+			content = content.concat(data.get("payment").toString());
+			ready();
+		};
+		if (data.get("footer") != null) {
+			content = content.concat(data.get("footer").toString());
+			ready();
+		};
+		
+		return(content);
+	};
+	
     public static String headers() {
         /* Generate the headers. 
         */
@@ -43,9 +98,35 @@ public class receipt {
         };
         
         
-        content = content.concat(content_headers);
+        data.put("headers", content_headers);
+		refresh();
         
         return(content_headers);
     };
+	
+	public static String action(String NAME, int QUANTITY, double PRICE, double TOTAL) {
+		/* Add an item to the cart. 
+			Parameters: 
+				(String) NAME: the name of the item
+				(int) QUANTITY: the quantity of the items in the cart
+				(double) PRICE: the unit price
+				(double) TOTAL: the total price
+			Returns: (String) the updated list of items in the cart
+		*/
+		
+		if (data.get("cart").toString().isBlank()) {
+			data.put("cart", "Quantity\tItem\tPrice\tTotal");
+		};
+		
+        data.put("cart", data.get("cart").toString().concat("\n"));
+		String item_current = String.join("\t", String.valueOf(QUANTITY), NAME, String.valueOf(PRICE), String.valueOf(TOTAL));
+		data.put("cart", data.get("cart").toString().concat(item_current));
+                
+                // Refresh. 
+		refresh();
+                
+                // Return the updated receipt section preview. 
+		return(data.get("cart").toString());
+	};
     
 }