net.sf.fikin.net.protocols.classpath
Class Handler

java.lang.Object
  java.net.URLStreamHandler
      net.sf.fikin.net.protocols.classpath.Handler

public class Handler
extends java.net.URLStreamHandler

URL protocol handler supporting predefined list of classloaders to load the given resource.

Built-in logic uses following classloaders (in given order):

• ClasspathStreamHandlerFactory.primaryClassLoader (if set)
• Handler's own classloader
• Thread's Context classloader
• System classloader

One can influence this logic by setting (at any moment of time) ClasspathStreamHandlerFactory.primaryClassLoader to some desired classloader.

created on Apr 28, 2005

Since:

Version:

$Revision: 1.2 $

Author:

fiykov

Constructor Summary

Handler()

Method Summary

protected java.net.URL	getResource(java.lang.String res) Loks up a list of classloaders for the given resource.
protected java.net.URL	getSysResURL(java.net.URL u) locate the resource in the context system resources
protected java.net.URLConnection	openConnection(java.net.URL u)

Methods inherited from class java.net.URLStreamHandler

equals, getDefaultPort, getHostAddress, hashCode, hostsEqual, openConnection, parseURL, sameFile, setURL, setURL, toExternalForm

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Handler

public Handler()

Method Detail

openConnection

protected java.net.URLConnection openConnection(java.net.URL u)
                                         throws java.io.IOException

Specified by:

openConnection in class java.net.URLStreamHandler

Throws:

java.io.IOException

getSysResURL

protected java.net.URL getSysResURL(java.net.URL u)

locate the resource in the context system resources

Returns:

valid resource url

Throws:

java.lang.InternalError - if the resource is missing

getResource

protected java.net.URL getResource(java.lang.String res)

Loks up a list of classloaders for the given resource. Order of classloaders used is:

• ClasspathStreamHandlerFactory.primaryClassLoader (if given)
• Handler's own classloader
• Thread's Context classloader
• System classloader

Parameters:

res - to find

Returns:

found resource by the first classloader or null if found by none of them