001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.web; 016 017 import java.io.InputStream; 018 import java.net.MalformedURLException; 019 import java.net.URL; 020 import java.util.List; 021 import java.util.Set; 022 023 import javax.servlet.ServletContext; 024 025 import org.apache.commons.logging.Log; 026 import org.apache.commons.logging.LogFactory; 027 import org.apache.hivemind.util.Defense; 028 import org.apache.tapestry.describe.DescriptionReceiver; 029 030 /** 031 * Adapts {@link javax.servlet.ServletContext} as {@link org.apache.tapestry.web.WebContext}. 032 * 033 * @author Howard M. Lewis Ship 034 * @since 4.0 035 */ 036 public class ServletWebContext implements WebContext 037 { 038 private static final Log LOG = LogFactory.getLog(ServletWebContext.class); 039 040 private final ServletContext _servletContext; 041 042 public ServletWebContext(ServletContext context) 043 { 044 Defense.notNull(context, "context"); 045 046 _servletContext = context; 047 } 048 049 public void describeTo(DescriptionReceiver receiver) 050 { 051 receiver.describeAlternate(_servletContext); 052 } 053 054 public List getAttributeNames() 055 { 056 return WebUtils.toSortedList(_servletContext.getAttributeNames()); 057 } 058 059 public Object getAttribute(String name) 060 { 061 return _servletContext.getAttribute(name); 062 } 063 064 public void setAttribute(String name, Object attribute) 065 { 066 if (attribute == null) 067 _servletContext.removeAttribute(name); 068 else 069 _servletContext.setAttribute(name, attribute); 070 071 } 072 073 public URL getResource(String path) 074 { 075 try 076 { 077 return _servletContext.getResource(path); 078 } 079 catch (MalformedURLException ex) 080 { 081 LOG.error(WebMessages.errorGettingResource(path, ex), ex); 082 083 return null; 084 } 085 } 086 087 public String getInitParameterValue(String name) 088 { 089 return _servletContext.getInitParameter(name); 090 } 091 092 public List getInitParameterNames() 093 { 094 return WebUtils.toSortedList(_servletContext.getInitParameterNames()); 095 } 096 097 public String getMimeType(String resourcePath) 098 { 099 return _servletContext.getMimeType(resourcePath); 100 } 101 102 public String getRealPath(String path) { 103 return _servletContext.getRealPath(path); 104 } 105 106 public InputStream getResourceAsStream(String path) { 107 return _servletContext.getResourceAsStream(path); 108 } 109 110 public Set getResourcePaths(String path) { 111 return _servletContext.getResourcePaths(path); 112 } 113 }