org.springframework.webflow.context.servlet

Class FilenameFlowUrlHandler

java.lang.Object

org.springframework.webflow.context.servlet.DefaultFlowUrlHandler

org.springframework.webflow.context.servlet.FilenameFlowUrlHandler

All Implemented Interfaces:

FlowUrlHandler

public class FilenameFlowUrlHandler
extends DefaultFlowUrlHandler

A file name based FlowUrlHandler implementation that is an alternative to the standard DefaultFlowUrlHandler. Treats the filename of a request without the URL suffix and/or prefix as the flow id. Used by the FlowController implementation as a default implementation to preserve compatibility with existing Web Flow 2 applications.

This implementation extracts the filename and removes the file extension from the request URL. The results will be used as the flow Id that must be unique throughout the application. For example the URLs

        http://someHost/someApp/someServlet/foo
        http://someHost/someApp/someServlet/nestedPath/foo
        http://someHost/someApp/someServlet/nestedPath/foo.html
 

will all treat the filename "foo" as the flow id.

Note: Because this class only treats a filename as a flow id, clashes can result. For example:

 http://localhost/springtravel/app/hotel/booking
 http://localhost/springtravel/app/flight/booking
 

would both map the same flow id "booking", instead of "hotel/booking" and "flight/booking". This is an limitation of this implementation. Consider using the standard DefaultFlowUrlHandler that uses the request URL prefix as well to avoid these clashes.

Author:

Agim Emruli, Jeremy Grelle, Nazaret Kazarian

Constructor Summary

Constructors

Constructor and Description
FilenameFlowUrlHandler()

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.String	createFlowDefinitionUrl(java.lang.String flowId, AttributeMap<?> input, javax.servlet.http.HttpServletRequest request) The flow definition URL for the given flowId will be inferred from the URL of the current request, re-using the same path and file extension.
java.lang.String	getFlowId(javax.servlet.http.HttpServletRequest request) Extract the flow id from the request.

Methods inherited from class org.springframework.webflow.context.servlet.DefaultFlowUrlHandler

appendQueryParameters, createFlowExecutionUrl, getEncodingScheme, getFlowExecutionKey, setEncodingScheme

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FilenameFlowUrlHandler

public FilenameFlowUrlHandler()

Method Detail

getFlowId

public java.lang.String getFlowId(javax.servlet.http.HttpServletRequest request)

Description copied from interface: FlowUrlHandler

Extract the flow id from the request.

Specified by:

getFlowId in interface FlowUrlHandler

Overrides:

getFlowId in class DefaultFlowUrlHandler

Parameters:

request - the request

Returns:

the flow id, or null if no flow id is present

createFlowDefinitionUrl

public java.lang.String createFlowDefinitionUrl(java.lang.String flowId,
                                       AttributeMap<?> input,
                                       javax.servlet.http.HttpServletRequest request)

The flow definition URL for the given flowId will be inferred from the URL of the current request, re-using the same path and file extension.

Example - given a request originating at:

 http://someHost/someApp/someServlet/nestedPath/foo.html
 

and a request for the flow id "bar", the new flow definition URL would be:

 http://someHost/someApp/someServlet/nestedPath/bar.html
 

Specified by:

createFlowDefinitionUrl in interface FlowUrlHandler

Overrides:

createFlowDefinitionUrl in class DefaultFlowUrlHandler

Parameters:

flowId - the id of the flow definition

input - the input to pass the new flow execution

request - the current request

Returns:

the flow definition url