Added lookup of custom properties files, this means a webclient.properties can be added to alfresco.extension

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@2841 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/web/app/ResourceBundleWrapper.java

@@ -20,6 +20,7 @@ import java.util.Enumeration;
 import java.util.Locale;
 import java.util.MissingResourceException;
 import java.util.ResourceBundle;
+import java.util.Vector;
 
 import org.alfresco.error.AlfrescoRuntimeException;
 import org.apache.log4j.Logger;
@@ -28,6 +29,7 @@ import org.apache.log4j.Priority;
 /**
  * Wrapper around Alfresco Resource Bundle objects. Used to catch and handle missing
  * resource exception to help identify missing I18N strings in client apps.
+ * Also used to look for the requested string in a custom resource bundle.
  * 
  * @author Kevin Roast
  */
@@ -36,43 +38,91 @@ public final class ResourceBundleWrapper extends ResourceBundle
    private static Logger logger = Logger.getLogger(ResourceBundleWrapper.class);
    
    private ResourceBundle delegate;
+   private ResourceBundle delegateCustom;
    
    /**
     * Constructor
     * 
     * @param bundle       The ResourceBundle to route calls too
+    * @param customBundle A custom version of bundle to look in if the string is
+    *                     not found in bundle
     */
-   private ResourceBundleWrapper(ResourceBundle bundle)
+   private ResourceBundleWrapper(ResourceBundle bundle, ResourceBundle customBundle)
    {
       this.delegate = bundle;
+      this.delegateCustom = customBundle;
    }
    
    /**
     * @see java.util.ResourceBundle#getKeys()
     */
    public Enumeration<String> getKeys()
+   {
+      if (this.delegateCustom == null)
       {
          return this.delegate.getKeys();
       }
+      else
+      {
+         // get existing keys
+         Enumeration<String> keys = this.delegate.getKeys();
+         Enumeration<String> customKeys = this.delegateCustom.getKeys();
+         
+         // combine keys into one list
+         Vector<String> allKeys = new Vector<String>(100, 2);
+         while (keys.hasMoreElements())
+         {
+            allKeys.add(keys.nextElement());
+         }
+         while (customKeys.hasMoreElements())
+         {
+            allKeys.add(customKeys.nextElement());
+         }
+         
+         return allKeys.elements();
+      }
+   }
    
    /**
     * @see java.util.ResourceBundle#handleGetObject(java.lang.String)
     */
    protected Object handleGetObject(String key)
    {
+      Object result = null;
+      
       try
       {
-         return this.delegate.getObject(key);
+         result =  this.delegate.getObject(key);
       }
       catch (MissingResourceException err)
+      {
+         // if the string wasn't found in the normal bundle
+         // try the custom bundle if there is one
+         try
+         {
+            if (this.delegateCustom != null)
+            {
+               result = this.delegateCustom.getObject(key);
+            }
+         }
+         catch (MissingResourceException mre)
+         {
+            // don't do anything here, dealt with below
+         }
+         
+         // if the key was not found return a default string 
+         if (result == null)
          {
             if (logger.isEnabledFor(Priority.WARN))
                logger.warn("Failed to find I18N message string key: " + key);
          
-         return "$$" + key + "$$";
+            result = "$$" + key + "$$";
          }
       }
       
+      return result;
+   }
+   
    /**
     * Factory method to get a named wrapped resource bundle for a particular locale.
     * 
@@ -89,7 +139,48 @@ public final class ResourceBundleWrapper extends ResourceBundle
          throw new AlfrescoRuntimeException("Unable to load Alfresco messages bundle: " + name);
       }
       
+      // also look up the custom version of the bundle in the extension package
+      String customName = determineCustomBundleName(name);
+      ResourceBundle customBundle = null;
+      try
+      {
+         customBundle = ResourceBundle.getBundle(customName, locale);
+         
+         if (logger.isDebugEnabled())
+            logger.debug("Located and loaded custom bundle: " + customName);
+      }
+      catch (MissingResourceException mre)
+      {
+         // ignore the error, just leave custom bundle as null
+      }
+      
       // apply our wrapper to catch MissingResourceException
-      return new ResourceBundleWrapper(bundle);
+      return new ResourceBundleWrapper(bundle, customBundle);
+   }
+   
+   /**
+    * Determines the name for the custom bundle to lookup based on the given
+    * bundle name
+    * 
+    * @param bundleName The standard bundle
+    * @return The name of the custom bundle (in the alfresco.extension package)
+    */
+   protected static String determineCustomBundleName(String bundleName)
+   {
+      String extensionPackage = "alfresco.extension.";
+      String customBundleName = null;
+      
+      int idx = bundleName.lastIndexOf(".");
+      if (idx == -1)
+      {
+         customBundleName = extensionPackage + bundleName;
+      }
+      else
+      {
+         customBundleName = extensionPackage + 
+               bundleName.substring(idx+1, bundleName.length());
+      }
+      
+      return customBundleName;
    }
 }