package textbender.g.beans.beancontext; // Copyright 2003-2005, Michael Allan.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Textbender Software"), to deal in the Textbender Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Textbender Software, and to permit persons to whom the Textbender Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Textbender Software. THE TEXTBENDER SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE TEXTBENDER SOFTWARE OR THE USE OR OTHER DEALINGS IN THE TEXTBENDER SOFTWARE.

import java.beans.beancontext.*;
import java.util.*;
//import textbender.g.util.ListIterator0;


/** A service provider that holds a single instance of an irrevocable service,
  * which it provides to all requesting clients.
  */
public final class SimpleServiceProvider implements BeanContextServiceProvider
{


    /** Constructs a SimpleServiceProvider.
      *
      *     @param iS single service instance to provide
      */
    public SimpleServiceProvider( Object iS ) { serviceInstance = iS; }



   // - B e a n - C o n t e x t - S e r v i c e - P r o v i d e r ------------------------


    /** @return an empty iterator
      */
    public Iterator getCurrentServiceSelectors( BeanContextServices bcs, Class serviceClass )
    {
//      return currentServiceSelectors;
        return Collections.emptyList().listIterator();
    }
//
//      private static final ListIterator0 currentServiceSelectors = new ListIterator0(); // no selectors



    /** @return the single service instance
      */
    public Object getService
        ( BeanContextServices bCS, Object requestor, Class serviceClass, Object serviceSelector )
    {
        assert( serviceClass.isInstance( serviceInstance )); // BeanContextServices should police this
        return serviceInstance;
    }



    /** Does nothing.
      */
    public void releaseService( BeanContextServices bCS, Object requestor, Object service ) {}



//// P r i v a t e ///////////////////////////////////////////////////////////////////////


    private final Object serviceInstance;



}