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StrutsRequestWrapper.javaAPI DocExample3427Mon Jul 23 13:26:38 BST 2007org.apache.struts2.dispatcher

StrutsRequestWrapper

public class StrutsRequestWrapper extends HttpServletRequestWrapper
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").

Fields Summary
Constructors Summary
public StrutsRequestWrapper(HttpServletRequest req)
The constructor

param
req The request

        super(req);
Methods Summary
public java.lang.ObjectgetAttribute(java.lang.String s)
Gets the object, looking in the value stack if not found

param
s The attribute key

        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;