org.apache.turbine.pipeline

## Class DetermineActionValve

- java.lang.Object
- - org.apache.turbine.pipeline.AbstractValve
  - - org.apache.turbine.pipeline.DetermineActionValve

- All Implemented Interfaces:
    Valve

      public class DetermineActionValve
      extends AbstractValve

  This valve is responsible for setting the 'action' property of RunData based on request parameter. There is no default action, since a null action is perfectly valid.
  Author:
    James Taylor, Peter Courcoux

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DetermineActionValve()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `invoke(PipelineData pipelineData, ValveContext context)` Perform request processing as required by this Valve.

    - ### Methods inherited from class org.apache.turbine.pipeline.AbstractValve

      `getRunData, initialize`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### DetermineActionValve

          public DetermineActionValve()

  - ### Method Detail

    - #### invoke

          public void invoke(PipelineData pipelineData,
                    ValveContext context)
                      throws IOException,
                             TurbineException

      Description copied from interface: `Valve`

      Perform request processing as required by this Valve.

      An individual Valve MAY perform the following actions, in the specified order:

      - Examine and/or modify the properties of the specified Request and Response.
      - Examine the properties of the specified Request, completely generate the corresponding Response, and return control to the caller.
      - Examine the properties of the specified Request and Response, wrap either or both of these objects to supplement their functionality, and pass them on.
      - If the corresponding Response was not generated (and control was not returned, call the next Valve in the pipeline (if there is one) by executing `context.invokeNext()`.
      - Examine, but not modify, the properties of the resulting Response (which was created by a subsequently invoked Valve via a call to `context.invokeNext()`).

      A Valve MUST NOT do any of the following things:

      - Change request properties that have already been used to direct the flow of processing control for this request.
      - Create a completed Response AND pass this Request and Response on to the next Valve in the pipeline.
      - Consume bytes from the input stream associated with the Request, unless it is completely generating the response, or wrapping the request before passing it on.
      - Modify the HTTP headers included with the Response after the `invokeNext()` method has returned.
      - Perform any actions on the output stream associated with the specified Response after the `invokeNext()` method has returned.
      Specified by:
        `invoke` in interface `Valve`
      Specified by:
        `invoke` in class `AbstractValve`
      Parameters:
        `pipelineData` - The run-time information, including the servlet request and response we are processing.
        `context` - The valve context used to invoke the next valve in the current processing pipeline
      Throws:
        `IOException` - Thrown by a subsequent Valve.
        `TurbineException` - Thrown by a subsequent Valve.
      See Also:
        `Valve.invoke(PipelineData, ValveContext)`

Copyright © 2000–2018 The Apache Software Foundation. All rights reserved.