import and modify inventory handling

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

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+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package tech.iBeans.POSware.Lite;
+import tech.iBeans.POSware.Lite.data_test.*;
+
+import java.util.*;
+
+/**
+ *
+ * @author eleven
+ */
+public class inventory {
+    
+    public static Dictionary<String, Dictionary> items = new Hashtable<>();
+    
+    public static boolean refresh() {
+        /* Refresh the inventory. 
+        
+        Returns: (bool) the refresh state
+        */
+        // Pull the sample items. 
+        items = data_test.fake_items;
+        return (true);
+    };
+    
+    
+    public static Object get(String SKU, String PROPERTY) {
+        /* Get the information of a particular SKU. 
+        
+        Parameters: 
+            (String) SKU: the SKU of the product to look for
+            (String) PROPERTY: the property in search
+        Returns: (Object) the corresponding value
+        */
+        
+        Dictionary<String, Boolean> PROPERTY_EXISTS = new Hashtable<>();
+        
+        // Find the SKU. This isn't the most efficient method but will do for the purposes of lab. 
+        Enumeration<String> items_SKU = items.keys();
+        PROPERTY_EXISTS.put("SKU", false);
+        do {
+            String item_SKU = items_SKU.nextElement();
+            PROPERTY_EXISTS.put("SKU", item_SKU.equals(SKU));
+        } while (items_SKU.hasMoreElements() && (!(PROPERTY_EXISTS.get("SKU"))));
+        
+        // Stop when the SKU is not found. 
+        if (!PROPERTY_EXISTS.get("SKU")) {
+            return (null);
+        };
+        
+        // Find the property within the element. 
+        Enumeration<String> item_properties = items.get(SKU).keys();
+        do {
+            String item_property = item_properties.nextElement(); 
+            PROPERTY_EXISTS.put("Property", item_property.equals(PROPERTY));
+            if (PROPERTY_EXISTS.get("Property")) {
+                break;
+            };
+        } while (item_properties.hasMoreElements());
+        
+        if (PROPERTY_EXISTS.get("Property")) {
+            return (items.get(SKU)).get(PROPERTY);
+        };
+        
+        return (null);
+    };
+    
+    public static ArrayList<String> list() {
+        /* List all inventory items.
+        
+        Returns: (ArrayList<String>) The array list
+        */
+        
+        ArrayList<String> items_SKU = new ArrayList<>();
+        Enumeration<String> items_SKU_raw = items.keys();
+        do {
+            String item_SKU = items_SKU_raw.nextElement();
+            items_SKU.add(item_SKU);
+        } while (items_SKU_raw.hasMoreElements());
+        
+        return(items_SKU);
+    };
+    
+    public static ArrayList list(String PROPERTY) {
+        ArrayList<Object> items_data = new ArrayList<>();
+        ArrayList<String> items_SKU = list();
+        
+        for (String item_SKU : items_SKU) {
+            Object item_data = "";
+            try {
+                item_data = items.get(item_SKU).get(PROPERTY);
+            } catch (Exception e) {System.out.println("Exception occurred: " + e.getMessage());};
+            
+            if (item_data == null) {item_data = "";};
+            items_data.add(item_data);
+        };
+        
+        return(items_data);
+    };
+    
+    public static ArrayList<String> collate() {
+        /* Collate the names, replacing unknown names with their SKU. 
+        
+        Returns: (ArrayList<String>) the array list of names
+        */
+        
+        ArrayList<String> items_names_display = list("Name");
+        ArrayList<String> items_SKU = list();
+        for (int item_rank = 0; item_rank < items_names_display.size(); item_rank++) {
+            if (items_names_display.get(item_rank).isBlank()) {
+                items_names_display.set(item_rank, items_SKU.get(item_rank));
+            };
+        };
+        
+        return(items_names_display);
+        
+    }
+    
+    static {
+        refresh();
+    }
+};