[FOray-commit] SF.net SVN: foray: [7705] trunk/foray/foray-common/src/java/org/foray/common/AbstractURLStreamHandler.java

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

Revision: 7705
Author:   victormote
Date:     2006-06-19 10:02:20 -0700 (Mon, 19 Jun 2006)
ViewCVS:  http://svn.sourceforge.net/foray/?rev=7705&view=rev

Log Message:
-----------
Add backup scheme to find the class using java.protocol.handler.pkgs, as per Vincent Hennebert's original plan.

Modified Paths:
--------------
    trunk/foray/foray-common/src/java/org/foray/common/AbstractURLStreamHandler.java
Modified: trunk/foray/foray-common/src/java/org/foray/common/AbstractURLStreamHandler.java
===================================================================
--- trunk/foray/foray-common/src/java/org/foray/common/AbstractURLStreamHandler.java	2006-06-19 16:07:09 UTC (rev 7704)
+++ trunk/foray/foray-common/src/java/org/foray/common/AbstractURLStreamHandler.java	2006-06-19 17:02:20 UTC (rev 7705)
@@ -30,6 +30,7 @@
 
 import java.io.IOException;
 import java.net.URLStreamHandler;
+import java.util.StringTokenizer;
 
 /**
  * Abstract superclass for all URLStreamHandlers using the FOray scheme for
@@ -75,6 +76,63 @@
              * about it either. */
             return;
         }
+
+        /* The FOray Factory will not be able to register itself with Java in a
+         * case where other software running has already registered another
+         * URLStreamHandlerFactory first.
+         * Therefore, we will give Java another opportunity to find our custom
+         * handler by placing its location in the Java environment.
+         */
+
+        /* Parse the path. */
+        Class theClass = handler.getClass();
+        String classPath = theClass.getName();
+        int lastTokenDelimiter = classPath.lastIndexOf('.');
+        String className = classPath.substring(lastTokenDelimiter + 1,
+                classPath.length());
+
+        /* Validate the class name. */
+        if (!  className.equals("Handler")) {
+            return;
+        }
+
+        Package thePackage = theClass.getPackage();
+        String packageName = thePackage.getName();
+        lastTokenDelimiter = packageName.lastIndexOf('.');
+        String lastSubPackage = packageName.substring(lastTokenDelimiter + 1,
+                packageName.length());
+        /* The last sub-package must be equal to the name of the protocol, or
+         * Java won't find it. */
+        if (! lastSubPackage.equals(protocol)) {
+            return;
+        }
+
+        /* Add the packagePrefix to the Java search path. */
+        String packagePrefix = packageName.substring(0, lastTokenDelimiter);
+        String javaProperty = "java.protocol.handler.pkgs";
+        String searchPath = System.getProperty(javaProperty);
+
+        /* The search path doesn't exist. Create it. */
+        if (searchPath == null) {
+            System.setProperty(javaProperty, packagePrefix);
+            return;
+        }
+
+        /* The search path does exist. See if the package prefix is already
+         * registered. */
+        StringTokenizer packagePrefixIter = new StringTokenizer(
+                searchPath, "|");
+        while (packagePrefixIter.hasMoreTokens()) {
+            String token = packagePrefixIter.nextToken();
+            if (token.equals(packagePrefix)) {
+                /* It is already registered. No need to do it again. */
+                return;
+            }
+        }
+
+        /* It is not registered, so we need to add it. */
+        searchPath += "|" + packagePrefix;
+        System.setProperty(javaProperty, searchPath);
     }
 
 }


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.