DBResourceBundle


1   package com.teamkonzept.lib;
2   
3   import java.util.*;
4   import java.io.*;
5   import java.sql.*;
6   import com.teamkonzept.db.*;
7   import com.teamkonzept.lib.db.queries.TKDBPropGroupGetPropsByName;
8   
9   /**
10     <b>DBResourceBundle</b> maintains those properties, which are
11     stored in the database.
12   * @author  $Author: alex $
13   * @version $Revision: 1.4 $
14   */
15  public class DBResourceBundle extends ResourceBundle implements ConfigurationErrorCodes
16  {
17      /* class variables */
18      Hashtable props=new Hashtable();
19  
20      /* instance variables */
21      String   groupName;
22  
23      /**
24         Constructor, loads properties from the database.
25         @param groupName property group name
26       */
27      public DBResourceBundle(String   groupName) throws TKException
28      {
29      this.groupName = groupName;
30      loadProperties();
31      }
32  
33      /**
34         reloads the keys and values for this group from the database.
35       */
36      public void doReload() throws TKException
37      {
38      loadProperties();
39      }
40  
41      /**
42         Overridden method returns enumeration of all keys.
43       */
44      public Enumeration getKeys()
45      {
46      return props.keys();
47      }
48  
49      protected void loadProperties() throws TKException
50      {
51      try {
52          props.clear();
53          TKQuery q = TKDBManager.newQuery(TKDBPropGroupGetPropsByName.class);
54          q.setQueryParams("PROPGROUP_NAME", new String  (groupName));
55          q.execute();
56          ResultSet rs = q.fetchResultSet();
57          // TODO: leere Gruppe und nicht vorhandene unterscheiden
58          if (rs != null && rs.next()) 
59          {
60              do
61              {
62                  String   pName = rs.getString("NAME");
63                  String   pValue = rs.getString("VALUE");
64                  props.put(pName, pValue);
65              } while (rs.next());
66          }
67          else
68          {
69              throw new TKConfigurationException("Can't find Propertygroup " + groupName, NO_PROPERTY_FILE, HIGH_SEVERITY, true, null);
70          }
71      } catch (Throwable   e) {
72          throw DefaultExceptionHandler.getException(e);
73      }
74      
75      }
76  
77      /**
78         Overridden method returns an Object from the resource bundle.
79         @param key the search key
80       */
81      protected Object   handleGetObject(String   key) throws MissingResourceException
82      {
83      String   value = (String  ) props.get(key);
84      if (value == null) {
85          throw new MissingResourceException("The following property was not found:","DBResource: "+groupName, key);
86      }
87      return value;
88      }
89  
90      
91  }
92
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