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## org.apache.struts.chain.commands
Class ExecuteCommand

    java.lang.Object
      org.apache.struts.chain.commands.ActionCommandBase
          org.apache.struts.chain.commands.ExecuteCommand

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

Direct Known Subclasses:
  ExecuteForwardCommand

    public class ExecuteCommand

extends ActionCommandBase

Invoke the appropriate `Command` for this request. If the context's `ActionConfig` has no `command` property defined, no action will be taken. If the specified command cannot be found, a warning will be logged, but processing will continue. Depending on how the chain is configured, this can be used in place of an `Action` or as a method of performing pre-processing.

If used instead of an action, the command which is looked up should put an ActionForward into the context, unless it has already dealt with the response.

Version:
  $Id: ExecuteCommand.java 471754 2006-11-06 14:55:09Z husted $

Field Summary

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

Constructor Summary
`ExecuteCommand()`

Method Summary
`boolean` | `execute(ActionContext actionCtx)` If the `context` is "valid", lookup a command and execute it.
`protected org.apache.commons.chain.Command` | `getCommand(ActionContext context)` Find the `ActionConfig` in the current context and, if it is properly configured, lookup the appropriate `commons-chain` command.
`protected org.apache.commons.chain.Command` | `getCommand(String commandName, String catalogName)` Retrieve the specified Command from the specified Catalog.
`protected boolean` | `shouldProcess(ActionContext context)` Evaluate the current context to see if a command should even be executed.

Methods inherited from class org.apache.struts.chain.commands.ActionCommandBase
`execute`

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

Constructor Detail

### ExecuteCommand

    public ExecuteCommand()

Method Detail

### execute

    public boolean execute(ActionContext actionCtx)
                    throws Exception

  If the `context` is "valid", lookup a command and execute it.

  Specified by:
    `execute` in interface `ActionCommand`
  Specified by:
    `execute` in class `ActionCommandBase`
  Parameters:
    `actionCtx` - The `Context` for the current request
  Returns:
    the result of the lookup command's `execute` method, if executed, or `false` if it was not executed.
  Throws:
    `Exception` - on any error

### shouldProcess

    protected boolean shouldProcess(ActionContext context)

  Evaluate the current context to see if a command should even be executed.

  Parameters:
    `context` - A valid ActionContext
  Returns:
    TRUE if the pending Command should be executed

### getCommand

    protected org.apache.commons.chain.Command getCommand(ActionContext context)

  Find the `ActionConfig` in the current context and, if it is properly configured, lookup the appropriate `commons-chain` command.

  Parameters:
    `context` - A valid ActionContext
  Returns:
    a `Command` to execute, or null if none is specified or if the specified command cannot be found.

### getCommand

    protected org.apache.commons.chain.Command getCommand(String commandName,
                                                          String catalogName)

  Retrieve the specified Command from the specified Catalog.

  Parameters:
    `commandName` - The Command to retrieve.
    `catalogName` - The Catalog to search.
  Returns:
    Instantiated Command, or null

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