org.apache.commons.workflow.base
Class BaseRegistry

java.lang.Object
  org.apache.commons.workflow.base.BaseRegistry

All Implemented Interfaces:

Registry

public class BaseRegistry
extends Object
implements Registry

BaseRegistry is a convenient base class for more sophisticated Registry implementations.

Version:

$Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $

Author:

Craig R. McClanahan

Field Summary

protected HashMap	activities The set of Activity instances registered with this Registry, keyed by identifier.
protected static Registry	registry The singleton registry instance.

Constructor Summary

BaseRegistry()

Method Summary

void	addActivity(Activity activity) Add a new Activity to the set of Activity instances known to this Registry.
void	clear() Clear any existing Activity instances registered with this Registry.
Activity[]	findActivities() Return the complete set of Activity instances associated with this Activity.
Activity	findActivity(String id) Return the registered Activity with the specified identifier, if any; otherwise return null.
static Registry	getRegistry() Factory method to return a Singleton (per class loader) Registry instance.
void	removeActivity(Activity activity) Remove the specified Activity from this Registry.

Methods inherited from class java.lang.Object

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

Field Detail

activities

protected HashMap activities

The set of Activity instances registered with this Registry, keyed by identifier.

registry

protected static Registry registry

The singleton registry instance.

Constructor Detail

BaseRegistry

public BaseRegistry()

Method Detail

addActivity

public void addActivity(Activity activity)

Add a new Activity to the set of Activity instances known to this Registry.

Specified by:

addActivity in interface Registry

Parameters:

activity - The new activity to be added

clear

public void clear()

Clear any existing Activity instances registered with this Registry.

Specified by:

clear in interface Registry

findActivities

public Activity[] findActivities()

Return the complete set of Activity instances associated with this Activity. If there are no such registered Activity instances, a zero-length array is returned.

Specified by:

findActivities in interface Registry

findActivity

public Activity findActivity(String id)

Return the registered Activity with the specified identifier, if any; otherwise return null.

Specified by:

findActivity in interface Registry

Parameters:

id - Identifier of the desired Activity

removeActivity

public void removeActivity(Activity activity)

Remove the specified Activity from this Registry.

Specified by:

removeActivity in interface Registry

Parameters:

activity - The Activity to be removed

getRegistry

public static Registry getRegistry()

Factory method to return a Singleton (per class loader) Registry instance.