org.apache.struts.chain.commands
Class ExceptionCatcher

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

All Implemented Interfaces:

org.apache.commons.chain.Command, org.apache.commons.chain.Filter, ActionCommand

public class ExceptionCatcher
extends ActionCommandBase
implements org.apache.commons.chain.Filter

Intercept any exception thrown by a subsequent Command in this processing chain, and fire the configured exception handler chain after storing the exception that has occurred into the Context.

Version:

$Rev: 471754 $ $Date: 2005-11-12 13:01:44 -0500 (Sat, 12 Nov 2005) $

Field Summary

Fields inherited from interface org.apache.commons.chain.Command

CONTINUE_PROCESSING, PROCESSING_COMPLETE

Constructor Summary

ExceptionCatcher()

Method Summary

boolean	execute(ActionContext actionCtx) Clear any existing stored exception and pass the context on to the remainder of the current chain.
String	getCatalogName() Return the name of the Catalog in which to perform lookups, or null for the default Catalog.
String	getExceptionCommand() Return the name of the command to be executed if an exception occurs.
protected org.apache.commons.chain.Command	lookupExceptionCommand() Return the command to be executed if an exception occurs.
boolean	postprocess(org.apache.commons.chain.Context context, Exception exception) If an exception was thrown by a subsequent Command, pass it on to the specified exception handling chain.
void	setCatalogName(String catalogName) Set the name of the Catalog in which to perform lookups, or null for the default Catalog.
void	setExceptionCommand(String exceptionCommand) Set the name of the command to be executed if an exception occurs.

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

Methods inherited from interface org.apache.commons.chain.Command

execute

Constructor Detail

ExceptionCatcher

public ExceptionCatcher()

Method Detail

getCatalogName

public String getCatalogName()

Return the name of the Catalog in which to perform lookups, or null for the default Catalog.

Returns:

Name of catalog to use, or null

setCatalogName

public void setCatalogName(String catalogName)

Set the name of the Catalog in which to perform lookups, or null for the default Catalog.

Parameters:

catalogName - The new catalog name or null

getExceptionCommand

public String getExceptionCommand()

Return the name of the command to be executed if an exception occurs.

Returns:

The name of the command to be executed on an exception

setExceptionCommand

public void setExceptionCommand(String exceptionCommand)

Set the name of the command to be executed if an exception occurs.

Parameters:

exceptionCommand - The name of the chain to be executed

execute

public boolean execute(ActionContext actionCtx)
                throws Exception

Clear any existing stored exception and pass the context on to the remainder of the current chain.

Specified by:

execute in interface ActionCommand

Specified by:

execute in class ActionCommandBase

Parameters:

actionCtx - The Context for the current request

Returns:

false so that processing continues

Throws:

Exception - On any error

postprocess

public boolean postprocess(org.apache.commons.chain.Context context,
                           Exception exception)

If an exception was thrown by a subsequent Command, pass it on to the specified exception handling chain. Otherwise, do nothing.

Specified by:

postprocess in interface org.apache.commons.chain.Filter

Parameters:

context - The Context to be processed by this Filter

exception - The Exception (if any) that was thrown by the last Command that was executed; otherwise null

Returns:

TRUE if post processing an exception occurred and the exception processing chain invoked

Throws:

IllegalStateException - If exception throws exception

lookupExceptionCommand

protected org.apache.commons.chain.Command lookupExceptionCommand()

Return the command to be executed if an exception occurs.

Returns:

The command to be executed if an exception occurs

Throws:

IllegalArgumentException - If catalog cannot be found

IllegalStateException - If command property is not specified