/*
* $Id: StrutsRequestWrapper.java 454501 2006-10-09 20:49:26Z mrdon $
*
* Copyright 2006 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.struts2.dispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.ValueStack;
/**
* <!-- START SNIPPET: javadoc -->
*
* All Struts requests are wrapped with this class, which provides simple JSTL accessibility. This is because JSTL
* works with request attributes, so this class delegates to the value stack except for a few cases where required to
* prevent infinite loops. Namely, we don't let any attribute name with "#" in it delegate out to the value stack, as it
* could potentially cause an infinite loop. For example, an infinite loop would take place if you called:
* request.getAttribute("#attr.foo").
*
* <!-- END SNIPPET: javadoc -->
*
*/
public class StrutsRequestWrapper extends HttpServletRequestWrapper {
/**
* The constructor
* @param req The request
*/
public StrutsRequestWrapper(HttpServletRequest req) {
super(req);
}
/**
* Gets the object, looking in the value stack if not found
*
* @param s The attribute key
*/
public Object getAttribute(String s) {
if (s != null && s.startsWith("javax.servlet")) {
// don't bother with the standard javax.servlet attributes, we can short-circuit this
// see WW-953 and the forums post linked in that issue for more info
return super.getAttribute(s);
}
ActionContext ctx = ActionContext.getContext();
Object attribute = super.getAttribute(s);
boolean alreadyIn = false;
Boolean b = (Boolean) ctx.get("__requestWrapper.getAttribute");
if (b != null) {
alreadyIn = b.booleanValue();
}
// note: we don't let # come through or else a request for
// #attr.foo or #request.foo could cause an endless loop
if (!alreadyIn && attribute == null && s.indexOf("#") == -1) {
try {
// If not found, then try the ValueStack
ctx.put("__requestWrapper.getAttribute", Boolean.TRUE);
ValueStack stack = ctx.getValueStack();
if (stack != null) {
attribute = stack.findValue(s);
}
} finally {
ctx.put("__requestWrapper.getAttribute", Boolean.FALSE);
}
}
return attribute;
}
}