org.apache.avalon.framework.service

Class WrapperServiceSelector

public class WrapperServiceSelector extends Object implements ServiceSelector

This is a ServiceSelector implementation that can wrap around a legacy ComponentSelector object effectively adapting a ComponentSelector interface to a ServiceSelector interface.

This class implements the Component interface because it is used in environments which expect all components to implement Component.

Since: 4.1.4

Version: $Id: WrapperServiceSelector.java 30977 2004-07-30 03:57:54 -0500 (Fri, 30 Jul 2004) niclas $

Author: Avalon Development Team

Field Summary
String	m_key The role that this selector was aquired via.
ComponentSelector	m_selector The Selector we are wrapping.

Constructor Summary
	WrapperServiceSelector(String key, ComponentSelector selector) This constructor is a constructor for a ComponentServiceManager

Method Summary
ComponentSelector	getWrappedSelector() The WrapperServiceManager wraps ComponentSelectors in WrapperServiceSelectors when they are looked up.
boolean	isSelectable(Object policy) Check to see if a Object exists relative to the supplied policy.
void	release(Object object) Return the Object when you are finished with it.
Object	select(Object policy) Select a service based on a policy.

Field Detail

m_key

private final String m_key

The role that this selector was aquired via.

m_selector

private final ComponentSelector m_selector

The Selector we are wrapping.

Constructor Detail

WrapperServiceSelector

public WrapperServiceSelector(String key, ComponentSelector selector)

This constructor is a constructor for a ComponentServiceManager

Parameters: key the key used to aquire this selector selector the selector to wrap

Method Detail

getWrappedSelector

ComponentSelector getWrappedSelector()

The WrapperServiceManager wraps ComponentSelectors in WrapperServiceSelectors when they are looked up. This method makes it possible to release the original component selector.

Returns: The ComponentSelector being wrapped.

isSelectable

public boolean isSelectable(Object policy)

Check to see if a Object exists relative to the supplied policy.

Parameters: policy a Object containing the selection criteria

Returns: True if the component is available, False if it not.

Return the Object when you are finished with it. This allows the ServiceSelector to handle the End-Of-Life Lifecycle events associated with the Object. Please note, that no Exception should be thrown at this point. This is to allow easy use of the ServiceSelector system without having to trap Exceptions on a release.

Parameters: object The Object we are releasing.

select

public Object select(Object policy)

Select a service based on a policy.

Parameters: policy the policy

Returns: the service

Throws: ServiceException if unable to select service