| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.jsp; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.RequestDispatcher; |
| import javax.servlet.ServletException; |
| import javax.servlet.ServletRequest; |
| import javax.servlet.jsp.JspException; |
| import javax.servlet.jsp.PageContext; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * Encapsulates the process of calling into the Tapestry servlet to retrieve |
| * a URL. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 3.0 |
| * |
| **/ |
| public class URLRetriever |
| { |
| private static final Log LOG = LogFactory.getLog(URLRetriever.class); |
| |
| private PageContext _pageContext; |
| private String _serviceName; |
| private Object[] _serviceParameters; |
| |
| public URLRetriever(PageContext pageContext, String serviceName, Object[] serviceParameters) |
| { |
| _pageContext = pageContext; |
| _serviceName = serviceName; |
| _serviceParameters = serviceParameters; |
| } |
| |
| /** |
| * Invokes the servlet to retrieve the URL. The URL is inserted |
| * into the output (as with |
| * {@link RequestDispatcher#include(javax.servlet.ServletRequest, javax.servlet.ServletResponse)}). |
| * |
| * |
| **/ |
| |
| public void insertURL(String servletPath) throws JspException |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Obtaining Tapestry URL for service " + _serviceName + " at " + servletPath); |
| |
| ServletRequest request = _pageContext.getRequest(); |
| |
| RequestDispatcher dispatcher = request.getRequestDispatcher(servletPath); |
| |
| if (dispatcher == null) |
| throw new JspException( |
| Tapestry.format("URLRetriever.unable-to-find-dispatcher", servletPath)); |
| |
| request.setAttribute(Tapestry.TAG_SUPPORT_SERVICE_ATTRIBUTE, _serviceName); |
| request.setAttribute(Tapestry.TAG_SUPPORT_PARAMETERS_ATTRIBUTE, _serviceParameters); |
| request.setAttribute(Tapestry.TAG_SUPPORT_SERVLET_PATH_ATTRIBUTE, servletPath); |
| |
| try |
| { |
| _pageContext.getOut().flush(); |
| |
| dispatcher.include(request, _pageContext.getResponse()); |
| } |
| catch (IOException ex) |
| { |
| throw new JspException( |
| Tapestry.format("URLRetriever.io-exception", servletPath, ex.getMessage())); |
| } |
| catch (ServletException ex) |
| { |
| throw new JspException( |
| Tapestry.format("URLRetriever.servlet-exception", servletPath, ex.getMessage())); |
| } |
| finally |
| { |
| request.removeAttribute(Tapestry.TAG_SUPPORT_SERVICE_ATTRIBUTE); |
| request.removeAttribute(Tapestry.TAG_SUPPORT_PARAMETERS_ATTRIBUTE); |
| request.removeAttribute(Tapestry.TAG_SUPPORT_SERVLET_PATH_ATTRIBUTE); |
| } |
| |
| } |
| } |