org.apache.avalon.framework.component
Class WrapperComponentSelector

java.lang.Object
  extended byorg.apache.avalon.framework.component.WrapperComponentSelector
All Implemented Interfaces:
Component, ComponentSelector

public class WrapperComponentSelector
extends java.lang.Object
implements ComponentSelector

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

Since:
4.1.4
Version:
$Id: WrapperComponentSelector.java 30977 2004-07-30 08:57:54Z niclas $
Author:
Avalon Development Team

Constructor Summary
WrapperComponentSelector(java.lang.String key, ServiceSelector selector)
          This constructor is a constructor for a WrapperComponentSelector.
 
Method Summary
 boolean hasComponent(java.lang.Object policy)
          Check to see if a Component exists relative to the supplied policy.
 void release(Component object)
          Return the Object when you are finished with it.
 Component select(java.lang.Object policy)
          Select a Component based on a policy.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

WrapperComponentSelector

public WrapperComponentSelector(java.lang.String key,
                                ServiceSelector selector)
This constructor is a constructor for a WrapperComponentSelector.

Parameters:
key - the key used to aquire this selector
selector - the selector to wrap
Method Detail

select

public Component select(java.lang.Object policy)
                 throws ComponentException
Select a Component based on a policy.

Specified by:
select in interface ComponentSelector
Parameters:
policy - the policy
Returns:
the Component
Throws:
ComponentException - if unable to select service

hasComponent

public boolean hasComponent(java.lang.Object policy)
Check to see if a Component exists relative to the supplied policy.

Specified by:
hasComponent in interface ComponentSelector
Parameters:
policy - a Object containing the selection criteria
Returns:
True if the component is available, False if it not.

release

public void release(Component 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 ComponentSelector
Parameters:
object - The Object we are releasing.


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