Class WrapperServiceSelector

java.lang.Object
org.apache.avalon.framework.service.WrapperServiceSelector
All Implemented Interfaces:
org.apache.avalon.framework.service.ServiceSelector

public class WrapperServiceSelector extends 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 30977 2004-07-30 03:57:54 -0500 (Fri, 30 Jul 2004) niclas $
Author:
Avalon Development Team
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private final String
    The role that this selector was aquired via.
    private final org.apache.avalon.framework.component.ComponentSelector
    The Selector we are wrapping.
  • Constructor Summary

    Constructors
    Constructor
    Description
    WrapperServiceSelector(String key, org.apache.avalon.framework.component.ComponentSelector selector)
    This constructor is a constructor for a ComponentServiceManager
  • Method Summary

    Modifier and Type
    Method
    Description
    (package private) org.apache.avalon.framework.component.ComponentSelector
    The WrapperServiceManager wraps ComponentSelectors in WrapperServiceSelectors when they are looked up.
    boolean
    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.
    select(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 Details

    • m_selector

      private final org.apache.avalon.framework.component.ComponentSelector m_selector
      The Selector we are wrapping.
    • m_key

      private final String m_key
      The role that this selector was aquired via.
  • Constructor Details

    • WrapperServiceSelector

      public WrapperServiceSelector(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 Details

    • select

      public Object select(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:
      org.apache.avalon.framework.service.ServiceException - if unable to select service
    • isSelectable

      public boolean isSelectable(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(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.