| 1 | /* |
| 2 | * Copyright 2003,2004 The Apache Software Foundation. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.apache.pluto.driver.url; |
| 17 | |
| 18 | import javax.servlet.http.HttpServletRequest; |
| 19 | |
| 20 | /** |
| 21 | * @author <a href="mailto:ddewolf@apache.org">David H. DeWolf</a> |
| 22 | * @author <a href="mailto:zheng@apache.org">ZHENG Zhong</a> |
| 23 | */ |
| 24 | public class PortalURLFactory { |
| 25 | |
| 26 | private static final String KEY = PortalURL.class.getName(); |
| 27 | |
| 28 | /** The singleton factory instance. */ |
| 29 | private static final PortalURLFactory FACTORY = new PortalURLFactory(); |
| 30 | |
| 31 | |
| 32 | // Constructor ------------------------------------------------------------- |
| 33 | |
| 34 | /** |
| 35 | * Private constructor that prevents external instantiation. |
| 36 | */ |
| 37 | private PortalURLFactory() { |
| 38 | // Do nothing. |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Returns the singleton factory instance. |
| 43 | * @return the singleton factory instance. |
| 44 | */ |
| 45 | public static PortalURLFactory getFactory() { |
| 46 | return FACTORY; |
| 47 | } |
| 48 | |
| 49 | |
| 50 | // Public Methods ---------------------------------------------------------- |
| 51 | |
| 52 | /** |
| 53 | * Creates a portal URL from the servlet request. If the servlet request |
| 54 | * does not contain a portal URL (in request scope), the method creates a |
| 55 | * portal URL and saves it into the request scope. |
| 56 | * @param request the servlet request. |
| 57 | * @return a portal URL created from the servlet request. |
| 58 | */ |
| 59 | public PortalURL createPortalURL(HttpServletRequest request) { |
| 60 | PortalURL portalURL = (PortalURL) request.getAttribute(KEY); |
| 61 | if (portalURL == null) { |
| 62 | portalURL = PortalURLParser.getParser().parse(request); |
| 63 | request.setAttribute(KEY, portalURL); |
| 64 | } |
| 65 | return (PortalURL) portalURL.clone(); |
| 66 | } |
| 67 | |
| 68 | } |