org.apache.avalon.framework.service
Class WrapperServiceSelector

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

All Implemented Interfaces:

org.apache.avalon.framework.service.ServiceSelector

public class WrapperServiceSelector
extends java.lang.Object
implements org.apache.avalon.framework.service.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 506231 2007-02-12 02:36:54Z crossley $

Author:

Avalon Development Team

Field Summary

private java.lang.String	m_key The role that this selector was aquired via.
private org.apache.avalon.framework.component.ComponentSelector	m_selector The Selector we are wrapping.

Constructor Summary

WrapperServiceSelector(java.lang.String key, org.apache.avalon.framework.component.ComponentSelector selector)
This constructor is a constructor for a ComponentServiceManager

Method Summary

(package private) org.apache.avalon.framework.component.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 org.apache.avalon.framework.component.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,
                              org.apache.avalon.framework.component.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 org.apache.avalon.framework.service.ServiceException

Select a service based on a policy.

Specified by:

select in interface org.apache.avalon.framework.service.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 org.apache.avalon.framework.service.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 org.apache.avalon.framework.service.ServiceSelector

Parameters:

object - The Object we are releasing.

getWrappedSelector

org.apache.avalon.framework.component.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.