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## org.apache.struts.tiles.commands
Class TilesPreProcessor

    java.lang.Object
      org.apache.struts.tiles.commands.TilesPreProcessor

All Implemented Interfaces:
  org.apache.commons.chain.Command

    public class TilesPreProcessor

extends Object
implements org.apache.commons.chain.Command

Command class intended to perform responsibilities of the TilesRequestProcessor in Struts 1.1. Does not actually dispatch requests, but simply prepares the chain context for a later forward as appropriate. Should be added to a chain before something which would handle a conventional ForwardConfig.

This class will never have any effect on the chain unless a `TilesDefinitionFactory` can be found; however it does not consider the absence of a definition factory to be a fatal error; the command simply returns false and lets the chain continue.

To initialize the `TilesDefinitionFactory`, use `org.apache.struts.chain.commands.legacy.TilesPlugin`. This class is a simple extension to `org.apache.struts.tiles.TilesPlugin` which simply does not interfere with your choice of `RequestProcessor` implementation.

Field Summary

Fields inherited from interface org.apache.commons.chain.Command
`CONTINUE_PROCESSING, PROCESSING_COMPLETE`

Constructor Summary
`TilesPreProcessor()`

Method Summary
`protected void` | `doForward(ServletActionContext context, String uri)` Do an include of specified URI using a `RequestDispatcher`.
`protected void` | `doInclude(ServletActionContext context, String uri)` Do an include of specified URI using a `RequestDispatcher`.
`boolean` | `execute(org.apache.commons.chain.Context context)` If the current `ForwardConfig` is using "tiles", perform necessary pre-processing to set up the `TilesContext` and substitute a new `ForwardConfig` which is understandable to a `RequestDispatcher`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### TilesPreProcessor

    public TilesPreProcessor()

Method Detail

### execute

    public boolean execute(org.apache.commons.chain.Context context)
                    throws Exception

  If the current `ForwardConfig` is using "tiles", perform necessary pre-processing to set up the `TilesContext` and substitute a new `ForwardConfig` which is understandable to a `RequestDispatcher`.

  Note that if the command finds a previously existing `ComponentContext` in the request, then it infers that it has been called from within another tile, so instead of changing the `ForwardConfig` in the chain `Context`, the command uses `RequestDispatcher` to include the tile, and returns true, indicating that the processing chain is complete.

  Specified by:
    `execute` in interface `org.apache.commons.chain.Command`
  Parameters:
    `context` - The `Context` for the current request
  Returns:
    `false` in most cases, but true if we determine that we're processing in "include" mode.
  Throws:
    `Exception`

### doInclude

    protected void doInclude(ServletActionContext context,
                             String uri)
                      throws IOException,
                             ServletException

  Do an include of specified URI using a `RequestDispatcher`.

  Parameters:
    `context` - a chain servlet/web context
    `uri` - Context-relative URI to include
  Throws:
    `IOException`
    `ServletException`

### doForward

    protected void doForward(ServletActionContext context,
                             String uri)
                      throws IOException,
                             ServletException

  Do an include of specified URI using a `RequestDispatcher`.

  Parameters:
    `context` - a chain servlet/web context
    `uri` - Context-relative URI to include
  Throws:
    `IOException`
    `ServletException`

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