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package com.sun.xml.ws.api.handler;

import javax.xml.ws.handler.Handler;
import javax.xml.namespace.QName;
import java.util.Set;


/**
 * The MessageHandler class extends Handler
 * to provide typesafety for the message context parameter and add a method
 * to obtain access to the headers that may be processed by the handler.
 * Its provides similar functionality as a SOAPHandler but provides RI's
 * Message in the MessageContext. 
 * 
 * @author Rama Pulavarthi
 * @since JAX-WS 2.1.3
 */
public interface MessageHandler extends Handler {


   /** Gets the header blocks that can be processed by this Handler
   *  instance.
   *
   *  @return Set of QNames of header blocks processed by this
   *           handler instance. QName is the qualified
   *           name of the outermost element of the Header block.
  **/
  Set getHeaders();

}