org.apache.avalon.framework.service

Class WrapperServiceSelector

java.lang.Object

org.apache.avalon.framework.service.WrapperServiceSelector

public class WrapperServiceSelector
extends java.lang.Object

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

Fields

Modifier and Type	Field and Description
private java.lang.String	m_key The role that this selector was aquired via.
private ComponentSelector	m_selector The Selector we are wrapping.

Constructor Summary

Constructors

Constructor and Description
WrapperServiceSelector(java.lang.String key, ComponentSelector selector) This constructor is a constructor for a ComponentServiceManager

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Field Detail

m_selector

private final ComponentSelector m_selector

The Selector we are wrapping.

m_key

private final java.lang.String m_key

The role that this selector was aquired via.

Constructor Detail

WrapperServiceSelector

public WrapperServiceSelector(java.lang.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

select

public java.lang.Object select(java.lang.Object policy)
                        throws ServiceException

Select a service based on a policy.

Parameters:

policy - the policy

Returns:

the service

Throws:

ServiceException - if unable to select service

isSelectable

public boolean isSelectable(java.lang.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.

release

public void release(java.lang.Object object)

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.

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.