[FOray-commit] SF.net SVN: foray: [7735] trunk/foray/foray-common/src/java/org/foray/common/url/FOrayURLStreamHandlerFactory.java

[<vic...@us...>]

Revision: 7735
Author:   victormote
Date:     2006-06-24 08:55:16 -0700 (Sat, 24 Jun 2006)
ViewCVS:  http://svn.sourceforge.net/foray/?rev=7735&view=rev

Log Message:
-----------
Catch the Error thrown if a factory has already been registered with URL.

Modified Paths:
--------------
    trunk/foray/foray-common/src/java/org/foray/common/url/FOrayURLStreamHandlerFactory.java
Modified: trunk/foray/foray-common/src/java/org/foray/common/url/FOrayURLStreamHandlerFactory.java
===================================================================
--- trunk/foray/foray-common/src/java/org/foray/common/url/FOrayURLStreamHandlerFactory.java	2006-06-24 15:07:24 UTC (rev 7734)
+++ trunk/foray/foray-common/src/java/org/foray/common/url/FOrayURLStreamHandlerFactory.java	2006-06-24 15:55:16 UTC (rev 7735)
@@ -45,6 +45,8 @@
     /** The singleton instance of this class. */
     private static FOrayURLStreamHandlerFactory urlSHFactory;
 
+    private static boolean registrationAttempted = false;
+
     /**
      * Map of the protocols.
      * The key is a String containing the protocol name.
@@ -108,13 +110,36 @@
      */
     public static synchronized FOrayURLStreamHandlerFactory
             getURLStreamHandlerFactory() {
-        if (FOrayURLStreamHandlerFactory.urlSHFactory == null) {
-            FOrayURLStreamHandlerFactory.urlSHFactory
-                    = new FOrayURLStreamHandlerFactory();
+        createFactory();
+        return FOrayURLStreamHandlerFactory.urlSHFactory;
+    }
+
+    /**
+     * Creates the Singleton instance of this class if it has not already
+     * been created, and if it can be created.
+     */
+    private static void createFactory() {
+        if (FOrayURLStreamHandlerFactory.urlSHFactory != null) {
+            /* Factory is already created. */
+            return;
+        }
+        if (FOrayURLStreamHandlerFactory.registrationAttempted) {
+            /* Registration has already tried and failed. Don't try again. */
+            return;
+        }
+        FOrayURLStreamHandlerFactory.urlSHFactory
+                = new FOrayURLStreamHandlerFactory();
+        try {
             URL.setURLStreamHandlerFactory(
                     FOrayURLStreamHandlerFactory.urlSHFactory);
+        } catch (Error e) {
+            /* If an error is thrown, someone has already registered a
+             * URLStreamHandlerFactory, and we cannot register ours. All we
+             * can do is record the fact. */
+            FOrayURLStreamHandlerFactory.urlSHFactory = null;
+        } finally {
+            FOrayURLStreamHandlerFactory.registrationAttempted = true;
         }
-        return FOrayURLStreamHandlerFactory.urlSHFactory;
     }
 
 }


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