/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package javax.enterprise.inject;
import java.lang.annotation.Annotation;
import javax.inject.Provider;
import javax.enterprise.util.TypeLiteral;
/**
* Factory to create instances of a bean.
*
* <h3>Example: injecting and using Instance</h3>
*
* <code><pre>
* package example;
*
* import javax.enterprise.inject.*;
* import javax.servlet.*;
*
* public class MyServlet extends GenericServlet {
* {@link javax.enterprise.inject.Obtains @Obtains} {@literal @Instance}<MyBean> _beanFactory;
*
* public void service(ServletRequest req, ServletResponse res)
* {
* MyBean bean = _beanFactory.get();
* }
* }
* </pre></code>
*
* @see javax.event.Event
*/
public interface Instance<T> extends Provider<T>, Iterable<T>
{
/**
* Restricts the instance given a set of qualifiers
*/
public Instance<T> select(Annotation ... qualifiers);
/**
* Restricts the instance to a subtype and bindings.
*/
public <U extends T> Instance<U> select(Class<U> subtype,
Annotation... qualifiers);
/**
* Restricts the instance to a subtype and bindings.
*/
public <U extends T> Instance<U> select(TypeLiteral<U> subtype,
Annotation... qualifiers);
/**
* Test if there are any beans that match the instance.
*/
public boolean isUnsatisfied();
/**
* Test if there are multiple beans that match the instance.
*/
public boolean isAmbiguous();
}