org.apache.turbine.pipeline

## Class DetermineTargetValve

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

- All Implemented Interfaces:
    Valve

      public class DetermineTargetValve
      extends AbstractValve

  This valve is responsible for setting the 'target' property of the RunData. If it is not already set it attempts to get the target from the request parameter 'template'. If the parameter is not set, we use the homepage specified by the configuration property Turbine.TEMPLATE_HOMEPAGE. FIXME: The request parameter which determines the template should be configurable.
  Author:
    James Taylor, Peter Courcoux

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DetermineTargetValve()`

  - ### 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

    - #### DetermineTargetValve

          public DetermineTargetValve()

  - ### 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)`

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