Voodoo Code

VoodooClass.java

public static URL getJarURLFromURLEntry(URL url, String entry) throws IllegalArgumentException {
		URL jarUrl;
		String file = url.getFile();
		if ( ! entry.startsWith( "/" ) ) entry = "/" + entry;
		file = file.substring( 0, file.length() - entry.length() );
		if ( file.endsWith( "!" ) ) file = file.substring( 0, file.length() - 1 );
		try {
			String protocol = url.getProtocol();

			if ( "jar".equals( protocol )
					|| "wsjar".equals( protocol ) ) { //Websphere has it's own way
				//Original URL is like jar:protocol
				jarUrl = new URL( file );
				if ( "file".equals( jarUrl.getProtocol() ) ) {
					//not escaped, need to voodoo
					if ( file.indexOf( ' ' ) != -1 ) {
						//not escaped, need to voodoo
						jarUrl = new File( jarUrl.getFile() ).toURI().toURL(); //goes by toURI to escape the path
					}
				} //otherwise left as is
			}
			else if ( "zip".equals( protocol ) //Weblogic has it's own way
					|| "code-source".equals( url.getProtocol() ) //OC4J prevent ejb.jar access (ie everything without path)
					|| "file".equals( protocol )  //if no wrapping is done
					) {
				//we have extracted the zip file, so it should be read as a file
				if ( file.indexOf( ' ' ) != -1 ) {
					//not escaped, need to voodoo
					jarUrl = new File(file).toURI().toURL(); //goes by toURI to escape the path
				}
				else {
					jarUrl = new File(file).toURL();
				}
			}
			else {
				jarUrl = new URL( protocol, url.getHost(), url.getPort(), file );
			}
		}
		catch (MalformedURLException e) {
			throw new IllegalArgumentException(
					"Unable to determine JAR Url from " + url + ". Cause: " + e.getMessage()
			);
		}
		log.trace("JAR URL from URL Entry: {} >> {}", url, jarUrl);
		return jarUrl;
	}