/*
    * EL4J, the Extension Library for the J2EE, adds incremental enhancements to
    * the spring framework, http://el4j.sf.net
    * Copyright (C) 2005 by ELCA Informatique SA, Av. de la Harpe 22-24,
    * 1000 Lausanne, Switzerland, http://www.elca.ch
    *
    * EL4J is published under the GNU Lesser General Public License (LGPL)
    * Version 2.1. See http://www.gnu.org/licenses/
    *
   * This program 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. See the
   * GNU Lesser General Public License for more details.
   *
   * For alternative licensing, please contact info@elca.ch
   */
  package ch.elca.el4j.core.contextpassing;
  
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  
  /**
   * Default implementation of <code>ImplicitContextPassingRegistry</code>. To
   * register the implicit context passers, their classname is used as id.
   *
   * @svnLink $Revision: 3874 $;$Date: 2009-08-04 14:25:40 +0200 (Di, 04. Aug 2009) $;$Author: swismer $;$URL: https://el4j.svn.sourceforge.net/svnroot/el4j/branches/el4j_3_1/el4j/framework/modules/core/src/main/java/ch/elca/el4j/core/contextpassing/DefaultImplicitContextPassingRegistry.java $
   *
   * @author Andreas Pfenninger (APR)
   */
  public class DefaultImplicitContextPassingRegistry implements
  		ImplicitContextPassingRegistry {
  
  	/** All registered passers. */
  	private Map<String,ImplicitContextPasser> m_registeredPassers =
  		new HashMap<String,ImplicitContextPasser>();
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void registerImplicitContextPasser(
  			ImplicitContextPasser passer) {
  		String id = passer.getClass().getName();
  		m_registeredPassers.put(id, passer);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void unregisterImplicitContextPasser(
  			ImplicitContextPasser passer) {
  		String id = passer.getClass().getName();
  		m_registeredPassers.remove(id);
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public Map<String,Object> getAssembledImplicitContext() {
  		Map<String,Object> context = new HashMap<String,Object>();
  		Iterator<String> it = m_registeredPassers.keySet().iterator();
  		while (it.hasNext()) {
  			String id = (String) it.next();
  			ImplicitContextPasser passer
  				= (ImplicitContextPasser) m_registeredPassers.get(id);
  			Object ctx = passer.getImplicitlyPassedContext();
  			context.put(id, ctx);
  		}
  		return context;
  	}
  
  	/**
  	 * {@inheritDoc}
  	 */
  	public void pushAssembledImplicitContext(Map<String,Object> contexts) {
  		Iterator<String> it = m_registeredPassers.keySet().iterator();
  		while (it.hasNext()) {
  			String id = (String) it.next();
  			ImplicitContextPasser passer
  				= (ImplicitContextPasser) m_registeredPassers.get(id);
  			Object ctx = contexts.get(id);
  			passer.pushImplicitlyPassedContext(ctx);
  		}
  	}
  }