org.apache.avalon.framework.service
Class WrapperServiceSelector

java.lang.Object
  org.apache.avalon.framework.service.WrapperServiceSelector

All Implemented Interfaces:

ServiceSelector

public class WrapperServiceSelector

extends java.lang.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 08:57:54Z niclas $

Author:

Avalon Development Team

Constructor Summary

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

Method Summary

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

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.

Specified by:

select in interface ServiceSelector

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.

Specified by:

isSelectable in interface ServiceSelector

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.

Specified by:

release in interface ServiceSelector

Parameters:

object - The Object we are releasing.