1 /*
2 * $Id: TagUtils.java 572226 2007-09-03 03:25:47Z mrdon $
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21 package org.apache.struts2.views.jsp;
22
23 import java.util.Map;
24
25 import javax.servlet.http.HttpServletRequest;
26 import javax.servlet.http.HttpServletResponse;
27 import javax.servlet.jsp.PageContext;
28
29 import org.apache.struts2.RequestUtils;
30 import org.apache.struts2.ServletActionContext;
31 import org.apache.struts2.dispatcher.ApplicationMap;
32 import org.apache.struts2.dispatcher.Dispatcher;
33 import org.apache.struts2.dispatcher.RequestMap;
34 import org.apache.struts2.dispatcher.SessionMap;
35 import org.apache.struts2.dispatcher.mapper.ActionMapper;
36 import org.apache.struts2.dispatcher.mapper.ActionMapping;
37 import org.apache.struts2.util.AttributeMap;
38
39 import com.opensymphony.xwork2.ActionContext;
40 import com.opensymphony.xwork2.ActionInvocation;
41 import com.opensymphony.xwork2.config.ConfigurationException;
42 import com.opensymphony.xwork2.util.ValueStack;
43 import com.opensymphony.xwork2.util.ValueStackFactory;
44
45
46 /**
47 */
48 public class TagUtils {
49
50 public static ValueStack getStack(PageContext pageContext) {
51 HttpServletRequest req = (HttpServletRequest) pageContext.getRequest();
52 ValueStack stack = (ValueStack) req.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
53
54 if (stack == null) {
55 stack = ValueStackFactory.getFactory().createValueStack();
56
57 HttpServletResponse res = (HttpServletResponse) pageContext.getResponse();
58 Dispatcher du = Dispatcher.getInstance();
59 if (du == null) {
60 throw new ConfigurationException("The Struts dispatcher cannot be found. This is usually caused by "+
61 "using Struts tags without the associated filter. Struts tags are only usable when the request "+
62 "has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag.");
63 }
64 Map extraContext = du.createContextMap(new RequestMap(req),
65 req.getParameterMap(),
66 new SessionMap(req),
67 new ApplicationMap(pageContext.getServletContext()),
68 req,
69 res,
70 pageContext.getServletContext());
71 extraContext.put(ServletActionContext.PAGE_CONTEXT, pageContext);
72 stack.getContext().putAll(extraContext);
73 req.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
74
75 // also tie this stack/context to the ThreadLocal
76 ActionContext.setContext(new ActionContext(stack.getContext()));
77 } else {
78 // let's make sure that the current page context is in the action context
79 Map context = stack.getContext();
80 context.put(ServletActionContext.PAGE_CONTEXT, pageContext);
81
82 AttributeMap attrMap = new AttributeMap(context);
83 context.put("attr", attrMap);
84 }
85
86 return stack;
87 }
88
89 public static String buildNamespace(ActionMapper mapper, ValueStack stack, HttpServletRequest request) {
90 ActionContext context = new ActionContext(stack.getContext());
91 ActionInvocation invocation = context.getActionInvocation();
92
93 if (invocation == null) {
94 ActionMapping mapping = mapper.getMapping(request,
95 Dispatcher.getInstance().getConfigurationManager());
96
97 if (mapping != null) {
98 return mapping.getNamespace();
99 } else {
100 // well, if the ActionMapper can't tell us, and there is no existing action invocation,
101 // let's just go with a default guess that the namespace is the last the path minus the
102 // last part (/foo/bar/baz.xyz -> /foo/bar)
103
104 String path = RequestUtils.getServletPath(request);
105 return path.substring(0, path.lastIndexOf("/"));
106 }
107 } else {
108 return invocation.getProxy().getNamespace();
109 }
110 }
111 }
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