001/* 002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 * 016 * Contributors: 017 * Jean-Marc Orliaguet, Chalmers 018 * 019 * $Id$ 020 */ 021 022package org.nuxeo.theme.protocol.nxtheme; 023 024import java.net.InetAddress; 025import java.net.URL; 026import java.net.URLConnection; 027import java.net.URLStreamHandler; 028 029public final class Handler extends URLStreamHandler { 030 031 @Override 032 protected URLConnection openConnection(URL url) { 033 return new Connection(url); 034 } 035 036 /** 037 * Theme URL do not reference any networked resource. This method is called by URL.equals and URL.hashCode so that 038 * we need override it to avoid DNS lookup for the theme host. 039 * 040 * @param u a URL object 041 * @return null for url with nxtheme protocol, URLStreamHandler.getHostAddress(u) otherwise 042 */ 043 @Override 044 protected synchronized InetAddress getHostAddress(URL u) { 045 if ("nxtheme".equals(u.getProtocol())) { 046 // do not do a DNS lookup for a theme resource 047 return null; 048 } 049 return super.getHostAddress(u); 050 } 051 052}