framework/src/net/sf/tapestry/IBeanProvider.java

/*
 *  ====================================================================
 *  The Apache Software License, Version 1.1
 *
 *  Copyright (c) 2002 The Apache Software Foundation.  All rights
 *  reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in
 *  the documentation and/or other materials provided with the
 *  distribution.
 *
 *  3. The end-user documentation included with the redistribution,
 *  if any, must include the following acknowledgment:
 *  "This product includes software developed by the
 *  Apache Software Foundation (http://www.apache.org/)."
 *  Alternately, this acknowledgment may appear in the software itself,
 *  if and wherever such third-party acknowledgments normally appear.
 *
 *  4. The names "Apache" and "Apache Software Foundation" and
 *  "Apache Tapestry" must not be used to endorse or promote products
 *  derived from this software without prior written permission. For
 *  written permission, please contact apache@apache.org.
 *
 *  5. Products derived from this software may not be called "Apache",
 *  "Apache Tapestry", nor may "Apache" appear in their name, without
 *  prior written permission of the Apache Software Foundation.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 *  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 *  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 *  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *  ====================================================================
 *
 *  This software consists of voluntary contributions made by many
 *  individuals on behalf of the Apache Software Foundation.  For more
 *  information on the Apache Software Foundation, please see
 *  <http://www.apache.org/>.
 */
package net.sf.tapestry;

import java.util.Collection;

/**
 *  An object that provides a component with access to helper beans.
 *  Helper beans are JavaBeans associated with a page or component
 *  that are used to extend the functionality of the component via
 *  aggregation.
 *
 *  @author Howard Lewis Ship
 *  @version $Id$
 *  @since 1.0.4
 **/


public interface IBeanProvider
{
	/**
	 *  Returns the JavaBean with the specified name.  The bean is created as needed.
	 *
	 *  @throws ApplicationRuntimeException if no such bean is available.
	 *
	 **/
	
	public Object getBean(String name);
	
	/**
	 *  Returns the {@link IComponent} (which may be a 
	 *  {@link net.sf.tapestry.IPage}) for which
	 *  this bean provider is providing beans.
	 *
	 *  @since 1.0.5
	 **/
	
	public IComponent getComponent();
	
	/**
	 *  Returns a collection of the names of any beans which may
	 *  be provided.
	 *
	 *  @since 1.0.6
	 *  @see net.sf.tapestry.spec.ComponentSpecification#getBeanNames()
	 *
	 **/
	
	public Collection getBeanNames();
	
    /**
     *  Returns true if the provider can provide the named bean.
     * 
     *  @since 2.2
     * 
     **/
    
    public boolean canProvideBean(String name);
    
	/**
	 *  Returns a resource resolver.
	 * 
	 *  @since 1.0.8
	 * 
	 **/
	
	public IResourceResolver getResourceResolver();
	
}