1 /*
2 * $Id: TagUtils.java 670170 2008-06-21 09:40:34Z hermanns $
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
22 package org.apache.struts2.views.jsp;
23
24 import java.util.Map;
25
26 import javax.servlet.http.HttpServletRequest;
27 import javax.servlet.http.HttpServletResponse;
28 import javax.servlet.jsp.PageContext;
29
30 import org.apache.struts2.RequestUtils;
31 import org.apache.struts2.ServletActionContext;
32 import org.apache.struts2.dispatcher.ApplicationMap;
33 import org.apache.struts2.dispatcher.Dispatcher;
34 import org.apache.struts2.dispatcher.RequestMap;
35 import org.apache.struts2.dispatcher.SessionMap;
36 import org.apache.struts2.dispatcher.mapper.ActionMapper;
37 import org.apache.struts2.dispatcher.mapper.ActionMapping;
38 import org.apache.struts2.util.AttributeMap;
39
40 import com.opensymphony.xwork2.ActionContext;
41 import com.opensymphony.xwork2.ActionInvocation;
42 import com.opensymphony.xwork2.config.ConfigurationException;
43 import com.opensymphony.xwork2.util.ValueStack;
44 import com.opensymphony.xwork2.util.ValueStackFactory;
45
46
47 /**
48 */
49 public class TagUtils {
50
51 public static ValueStack getStack(PageContext pageContext) {
52 HttpServletRequest req = (HttpServletRequest) pageContext.getRequest();
53 ValueStack stack = (ValueStack) req.getAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY);
54
55 if (stack == null) {
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 stack = du.getContainer().getInstance(ValueStackFactory.class).createValueStack();
65 Map<String, Object> extraContext = du.createContextMap(new RequestMap(req),
66 req.getParameterMap(),
67 new SessionMap(req),
68 new ApplicationMap(pageContext.getServletContext()),
69 req,
70 res,
71 pageContext.getServletContext());
72 extraContext.put(ServletActionContext.PAGE_CONTEXT, pageContext);
73 stack.getContext().putAll(extraContext);
74 req.setAttribute(ServletActionContext.STRUTS_VALUESTACK_KEY, stack);
75
76 // also tie this stack/context to the ThreadLocal
77 ActionContext.setContext(new ActionContext(stack.getContext()));
78 } else {
79 // let's make sure that the current page context is in the action context
80 Map<String, Object> context = stack.getContext();
81 context.put(ServletActionContext.PAGE_CONTEXT, pageContext);
82
83 AttributeMap attrMap = new AttributeMap(context);
84 context.put("attr", attrMap);
85 }
86
87 return stack;
88 }
89
90 public static String buildNamespace(ActionMapper mapper, ValueStack stack, HttpServletRequest request) {
91 ActionContext context = new ActionContext(stack.getContext());
92 ActionInvocation invocation = context.getActionInvocation();
93
94 if (invocation == null) {
95 ActionMapping mapping = mapper.getMapping(request,
96 Dispatcher.getInstance().getConfigurationManager());
97
98 if (mapping != null) {
99 return mapping.getNamespace();
100 } else {
101 // well, if the ActionMapper can't tell us, and there is no existing action invocation,
102 // let's just go with a default guess that the namespace is the last the path minus the
103 // last part (/foo/bar/baz.xyz -> /foo/bar)
104
105 String path = RequestUtils.getServletPath(request);
106 return path.substring(0, path.lastIndexOf("/"));
107 }
108 } else {
109 return invocation.getProxy().getNamespace();
110 }
111 }
112 }
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