ExampleInventoryRead


1   package persist.gettingStarted;
2   
3   import java.io.File  ;
4   
5   import com.sleepycat.je.DatabaseException;
6   import com.sleepycat.persist.EntityCursor;
7    
8   public class ExampleInventoryRead {
9   
10      private static File   myDbEnvPath = 
11          new File  ("/tmp/JEDB");
12  
13      private DataAccessor da;
14  
15      // Encapsulates the database environment.
16      private static MyDbEnv myDbEnv = new MyDbEnv();
17  
18      // The item to locate if the -s switch is used
19      private static String   locateItem;
20   
21      private static void usage() {
22          System.out.println("ExampleInventoryRead [-h <env directory>]" +
23                             "[-s <item to locate>]");
24          System.exit(-1);
25      }
26  
27      public static void main(String   args[]) {
28          ExampleInventoryRead eir = new ExampleInventoryRead();
29          try {
30              eir.run(args);
31          } catch (DatabaseException dbe) {
32              System.err.println("ExampleInventoryRead: " + dbe.toString());
33              dbe.printStackTrace();
34          } finally {
35              myDbEnv.close();
36          }
37          System.out.println("All done.");
38      }
39  
40      private void run(String   args[]) 
41          throws DatabaseException {
42          // Parse the arguments list
43          parseArgs(args);
44    
45          myDbEnv.setup(myDbEnvPath, // path to the environment home
46                        true);       // is this environment read-only?
47  
48          // Open the data accessor. This is used to retrieve
49          // persistent objects.
50          da = new DataAccessor(myDbEnv.getEntityStore());
51  
52          // If a item to locate is provided on the command line,
53          // show just the inventory items using the provided name.
54          // Otherwise, show everything in the inventory.
55          if (locateItem != null) {
56              showItem();
57          } else {
58              showAllInventory();
59          }
60      }
61  
62      // Shows all the inventory items that exist for a given
63      // inventory name.
64      private void showItem() throws DatabaseException {
65  
66          // Use the inventory name secondary key to retrieve
67          // these objects.
68          EntityCursor<Inventory> items =
69              da.inventoryByName.subIndex(locateItem).entities();
70          try {
71              for (Inventory item : items) {
72                  displayInventoryRecord(item);
73              }
74          } finally {
75              items.close();
76          }
77      }
78  
79      // Displays all the inventory items in the store
80      private void showAllInventory() 
81          throws DatabaseException {
82  
83          // Get a cursor that will walk every
84          // inventory object in the store.
85          EntityCursor<Inventory> items =
86              da.inventoryBySku.entities();
87  
88          try { 
89              for (Inventory item : items) {
90                  displayInventoryRecord(item);
91              }
92          } finally {
93              items.close();
94          }
95      }
96  
97      private void displayInventoryRecord(Inventory theInventory)
98              throws DatabaseException {
99          
100             System.out.println(theInventory.getSku() + ":");
101             System.out.println("\t " + theInventory.getItemName());
102             System.out.println("\t " + theInventory.getCategory());
103             System.out.println("\t " + theInventory.getVendor());
104             System.out.println("\t\tNumber in stock: " + 
105                 theInventory.getVendorInventory());
106             System.out.println("\t\tPrice per unit:  " + 
107                 theInventory.getVendorPrice());
108             System.out.println("\t\tContact: ");
109 
110             Vendor theVendor = 
111                     da.vendorByName.get(theInventory.getVendor());
112             assert theVendor != null;
113 
114             System.out.println("\t\t " + theVendor.getAddress());
115             System.out.println("\t\t " + theVendor.getCity() + ", " + 
116                 theVendor.getState() + " " + theVendor.getZipcode());
117             System.out.println("\t\t Business Phone: " + 
118                 theVendor.getBusinessPhoneNumber());
119             System.out.println("\t\t Sales Rep: " + 
120                                 theVendor.getRepName());
121             System.out.println("\t\t            " + 
122                 theVendor.getRepPhoneNumber());
123     }
124 
125     protected ExampleInventoryRead() {}
126     
127     private static void parseArgs(String   args[]) {
128         for(int i = 0; i < args.length; ++i) {
129             if (args[i].startsWith("-")) {
130                 switch(args[i].charAt(1)) {
131                     case 'h':
132                         myDbEnvPath = new File  (args[++i]);
133                         break;
134                     case 's':
135                         locateItem = args[++i];
136                         break;
137                     default:
138                         usage();
139                 }
140             }
141         }
142     }
143 }
144
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