Modified things further. Moved message manager management entirely into

the default application. Derived applications now simply provide a message
bundle path if they want a message manager. Also now pass an application
reference to the logic instances when they are invoked so that they can
easily access application-wide resources.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@91 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/webmacro/Application.java

@@ -1,5 +1,5 @@
 //
-// $Id: Application.java,v 1.2 2001/03/04 06:25:48 mdb Exp $
+// $Id: Application.java,v 1.3 2001/03/04 06:37:51 mdb Exp $
 
 package com.samskivert.webmacro;
 
@@ -36,24 +36,84 @@ public class Application
     }
 
     /**
-     * If an application wishes to make use of the translation facilities
-     * provided by the message manager, it can instantiate one and make it
-     * available through this member function. This allows framework
-     * components like the <code>MsgTool</code> to make use of the
-     * application's message bundles.
+     * Returns the message manager in effect for this application, if one
+     * is in effect.
      */
     public MessageManager getMessageManager ()
+    {
+        return _msgmgr;
+    }
+
+    /**
+     * If an application wishes to make use of the translation facilities
+     * provided by the message manager, it need only provide the path to
+     * its message resource bundle via this member function. Using a
+     * message manager allows framework components like the
+     * <code>MsgTool</code> to make use of the application's message
+     * bundles.
+     */
+    protected String getMessageBundlePath ()
     {
         return null;
     }
 
     /**
-     * The default application implementation takes the base URI and base
-     * package as defined in the application declaration in the servlet
-     * configuration and uses those to determine whether or not a given
-     * URI maps to this application.
+     * A convenience function for translating messages.
      */
-    public void setConfig (String baseURI, String basePkg)
+    public final String translate (WebContext ctx, String msg)
+    {
+        return _msgmgr.getMessage(ctx.getRequest(), msg);
+    }
+
+    /**
+     * A convenience function for translating messages.
+     */
+    public final String translate (WebContext ctx, String msg, Object arg)
+    {
+        return _msgmgr.getMessage(ctx.getRequest(), msg,
+                                  new Object[]{ arg });
+    }
+
+    /**
+     * A convenience function for translating messages.
+     */
+    public final String translate (WebContext ctx, String msg,
+                                   Object arg1, Object arg2)
+    {
+        return _msgmgr.getMessage(ctx.getRequest(), msg,
+                                  new Object[]{ arg1, arg2 });
+    }
+
+    /**
+     * A convenience function for translating messages.
+     */
+    public final String translate (WebContext ctx, String msg,
+                                   Object arg1, Object arg2, Object arg3)
+    {
+        return _msgmgr.getMessage(ctx.getRequest(), msg,
+                                  new Object[]{ arg1, arg2, arg3 });
+    }
+
+    /**
+     * A convenience function for translating messages.
+     */
+    public final String translate (WebContext ctx, String msg,
+                                   Object[] args)
+    {
+        return _msgmgr.getMessage(ctx.getRequest(), msg, args);
+    }
+
+    /**
+     * Performs initializations common to all applications. We could put
+     * this in init() and require application derived classes to call
+     * super.init() but people would forget to do so and be confused.
+     *
+     * <p> The default application implementation takes the base URI and
+     * base package as defined in the application declaration in the
+     * servlet configuration and uses those to determine whether or not a
+     * given URI maps to this application.
+     */
+    public void preInit (String baseURI, String basePkg)
     {
         // remove any trailing slash
         if (baseURI.endsWith("/")) {
@@ -68,6 +128,12 @@ public class Application
         } else {
             _basePkg = basePkg;
         }
+
+        // instantiate our message manager if the application wants one
+        String bpath = getMessageBundlePath();
+        if (bpath != null) {
+            _msgmgr = new MessageManager(bpath);
+        }
     }
 
     /**
@@ -95,48 +161,9 @@ public class Application
         return _basePkg + uri;
     }
 
-    /**
-     * A convenience function for translating messages.
-     */
-    public final String translate (WebContext ctx, String msg)
-    {
-        MessageManager msgmgr = getMessageManager();
-        return msgmgr.getMessage(ctx.getRequest(), msg);
-    }
-
-    /**
-     * A convenience function for translating messages.
-     */
-    public final String translate (WebContext ctx, String msg, Object arg)
-    {
-        MessageManager msgmgr = getMessageManager();
-        return msgmgr.getMessage(ctx.getRequest(), msg, new Object[]{ arg });
-    }
-
-    /**
-     * A convenience function for translating messages.
-     */
-    public final String translate (WebContext ctx, String msg, Object arg1,
-                                   Object arg2)
-    {
-        MessageManager msgmgr = getMessageManager();
-        return msgmgr.getMessage(ctx.getRequest(), msg,
-                                 new Object[]{ arg1, arg2 });
-    }
-
-    /**
-     * A convenience function for translating messages.
-     */
-    public final String translate (WebContext ctx, String msg, Object arg1,
-                                   Object arg2, Object arg3)
-    {
-        MessageManager msgmgr = getMessageManager();
-        return msgmgr.getMessage(ctx.getRequest(), msg,
-                                 new Object[]{ arg1, arg2, arg3 });
-    }
-
     protected String _baseURI;
     protected String _basePkg;
+    protected MessageManager _msgmgr;
 
     /**
      * This is the default file extension.

projects/samskivert/src/java/com/samskivert/webmacro/DispatcherServlet.java

@@ -1,5 +1,5 @@
 //
-// $Id: DispatcherServlet.java,v 1.8 2001/03/04 06:22:17 mdb Exp $
+// $Id: DispatcherServlet.java,v 1.9 2001/03/04 06:37:51 mdb Exp $
 
 package com.samskivert.webmacro;
 
@@ -186,7 +186,7 @@ public class DispatcherServlet extends WMServlet
                     }
 
                     // now initialize the applicaiton
-                    app.setConfig(baseURI, basePkg);
+                    app.preInit(baseURI, basePkg);
                     app.init(getServletContext());
 
                     // finally add it to our list
@@ -240,7 +240,7 @@ public class DispatcherServlet extends WMServlet
                 // execute it if it exists
                 Logic logic = resolveLogic(app, path);
                 if (logic != null) {
-                    logic.invoke(ctx);
+                    logic.invoke(app, ctx);
                 }
 	    }
 

projects/samskivert/src/java/com/samskivert/webmacro/Logic.java

@@ -1,5 +1,5 @@
 //
-// $Id: Logic.java,v 1.1 2001/03/01 21:06:22 mdb Exp $
+// $Id: Logic.java,v 1.2 2001/03/04 06:37:51 mdb Exp $
 
 package com.samskivert.webmacro;
 
@@ -22,9 +22,11 @@ public interface Logic
      * converted into friendly error messages using the exception mapping
      * services.
      *
+     * @param app The application that generated this logic instance (used
+     * to access application-wide resources).
      * @param context The WebMacro context in scope for this request.
      *
      * @see ExceptionMap
      */
-    public void invoke (WebContext context) throws Exception;
+    public void invoke (Application app, WebContext context) throws Exception;
 }