org.directwebremoting.impl
Class DefaultWebContext

java.lang.Object
  org.directwebremoting.impl.DefaultServerContext
      org.directwebremoting.impl.DefaultWebContext

All Implemented Interfaces:

RealWebContext, ServerContext, WebContext

public class DefaultWebContext
extends DefaultServerContext
implements RealWebContext

A default implementation of WebContext.

Author:

Joe Walker [joe at getahead dot ltd dot uk]

Field Summary

Fields inherited from interface org.directwebremoting.WebContext

ATTRIBUTE_DWR

Method Summary

void	checkPageInformation(java.lang.String sentPage, java.lang.String sentScriptId, java.lang.String windowName) Fill in the page details from the servlet request.
java.lang.String	forwardToString(java.lang.String url) Forward a request to a given URL and catch the data written to it.
java.lang.String	getCurrentPage() Returns the partial-URL of the page from which the current thread originated.
javax.servlet.http.HttpServletRequest	getHttpServletRequest() Accessor for the http request information.
javax.servlet.http.HttpServletResponse	getHttpServletResponse() Accessor for the http response bean.
ScriptSession	getScriptSession() Get the script session that represents the currently viewed page in the same way that an HttpSession represents a cookie.
javax.servlet.http.HttpSession	getSession() Returns the current session associated with this request, or if the request does not have a session, creates one.
javax.servlet.http.HttpSession	getSession(boolean create) Returns the current HttpSession associated with this request or, if there is no current session and create is true, returns a new session.
java.lang.String	toString()

Methods inherited from class org.directwebremoting.impl.DefaultServerContext

equals, getAllScriptSessions, getContainer, getContextPath, getScriptSessionById, getScriptSessionsByPage, getServletConfig, getServletContext, getVersion, setContainer, setServletConfig, setServletContext

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.directwebremoting.ServerContext

getAllScriptSessions, getContainer, getContextPath, getScriptSessionById, getScriptSessionsByPage, getServletConfig, getServletContext, getVersion

Method Detail

checkPageInformation

public void checkPageInformation(java.lang.String sentPage,
                                 java.lang.String sentScriptId,
                                 java.lang.String windowName)

Description copied from interface: RealWebContext

Fill in the page details from the servlet request.

This method should be used by anything that parses a batch, and then allows either uses a WebContext or allows other things to use a WebContext.

Caution Following this call, the passed scriptSessionId may be wrong. scriptSessionIds can become invalid due to server re-start, a timeout, or a back-button.

It seems wrong to throw a security exception, because it could be totally innocent. So this method will create a new script session and insert a script into the script session so that the page becomes synced with the new ID at the earliest possible opportunity.

Specified by:

checkPageInformation in interface RealWebContext

Parameters:

sentPage - The URL of the current page

sentScriptId - The session id passed in by the browser

windowName - Reverse Ajax uses window.name to avoid 2 connection limit

getCurrentPage

public java.lang.String getCurrentPage()

Description copied from interface: WebContext

Returns the partial-URL of the page from which the current thread originated. This string starts from (and includes) the application's context path, and therefore excludes the scheme, host, and port of the URL. If the URL has a query string (starting with and including a '?' character) and/or an in-page location (starting with and including a '#' character), these portions will be excluded. If the URL has a session identifier, i.e. via an application server's URL-rewriting behavior, this may not necessarily be excluded. e.g. Tomcat's default is to use ";jsessionid=123...". NOTE: this means that DWR will consider a session-appended URL to be distinct from a non-session-appended URL.

Specified by:

getCurrentPage in interface WebContext

See Also:

for details on how pages are converted from external form to this form.

getScriptSession

public ScriptSession getScriptSession()

Description copied from interface: WebContext

Get the script session that represents the currently viewed page in the same way that an HttpSession represents a cookie.

If the DWR thread that gave rise to this WebContext is as a result of a JSON call, this method will throw an UnsupportedOperationException

Specified by:

getScriptSession in interface WebContext

Returns:

A browser object for this user

getSession

public javax.servlet.http.HttpSession getSession()

Description copied from interface: WebContext

Returns the current session associated with this request, or if the request does not have a session, creates one.

Specified by:

getSession in interface WebContext

Returns:

Returns the http session.

See Also:

HttpServletRequest.getSession()

getSession

public javax.servlet.http.HttpSession getSession(boolean create)

Description copied from interface: WebContext

Returns the current HttpSession associated with this request or, if there is no current session and create is true, returns a new session. If create is false and the request has no valid HttpSession, this method returns null.

Specified by:

getSession in interface WebContext

Parameters:

create - false to return null if there's no current session

Returns:

the session associated with this request

See Also:

HttpServletRequest.getSession(boolean)

getHttpServletRequest

public javax.servlet.http.HttpServletRequest getHttpServletRequest()

Description copied from interface: WebContext

Accessor for the http request information.

Specified by:

getHttpServletRequest in interface WebContext

Returns:

Returns the request.

getHttpServletResponse

public javax.servlet.http.HttpServletResponse getHttpServletResponse()

Description copied from interface: WebContext

Accessor for the http response bean.

You can't use this request to directly reply to the response or to add headers or cookies.

Specified by:

getHttpServletResponse in interface WebContext

Returns:

Returns the response.

forwardToString

public java.lang.String forwardToString(java.lang.String url)
                                 throws javax.servlet.ServletException,
                                        java.io.IOException

Description copied from interface: WebContext

Forward a request to a given URL and catch the data written to it. It is possible to distinguish requests that arrive normally and requests that come from a DWR forwardToString() by the presence of a request attribute. Before the request is forwarded, DWR will call:

 request.setAttribute(WebContext.ATTRIBUTE_DWR, Boolean.TRUE);
 

Specified by:

forwardToString in interface WebContext

Parameters:

url - The URL to forward to

Returns:

The text that results from forwarding to the given URL

Throws:

javax.servlet.ServletException - if the target resource throws this exception

java.io.IOException - if the target resource throws this exception

toString

public java.lang.String toString()

Overrides:

toString in class DefaultServerContext