/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.xml.ws;

import javax.xml.transform.Source;
import javax.xml.bind.JAXBContext;

/** The <code>LogicalMessage</code> interface represents a
 *  protocol agnostic XML message and contains methods that
 *  provide access to the payload of the message.
 *
 *  @since JAX-WS 2.0
**/
public interface LogicalMessage {

  /** Gets the message payload as an XML source, may be called
   *  multiple times on the same LogicalMessage instance, always
   *  returns a new <code>Source</code> that may be used to retrieve the entire
   *  message payload.
   *
   *  <p>If the returned <code>Source</code> is an instance of 
   *  <code>DOMSource</code>, then
   *  modifications to the encapsulated DOM tree change the message
   *  payload in-place, there is no need to susequently call
   *  <code>setPayload</code>. Other types of <code>Source</code> provide only
   *  read access to the message payload.
   *
   *  @return The contained message payload; returns <code>null</code> if no 
   *          payload is present in this message.
  **/
  public Source getPayload();

  /** Sets the message payload
   *
   *  @param  payload message payload
   *  @throws WebServiceException If any error during the setting
   *          of the payload in this message
   *  @throws java.lang.UnsupportedOperationException If this
   *          operation is not supported
  **/
  public void setPayload(Source payload);

  /** Gets the message payload as a JAXB object. Note that there is no
   *  connection between the returned object and the message payload,
   *  changes to the payload require calling <code>setPayload</code>.
   *
   *  @param  context The JAXBContext that should be used to unmarshall
   *          the message payload
   *  @return The contained message payload; returns <code>null</code> if no 
   *          payload is present in this message
   *  @throws WebServiceException If an error occurs when using a supplied
   *     JAXBContext to unmarshall the payload. The cause of
   *     the WebServiceException is the original JAXBException.
  **/
  public Object getPayload(JAXBContext context);

  /** Sets the message payload
   *
   *  @param  payload message payload
   *  @param  context The JAXBContext that should be used to marshall 
   *          the payload
   *  @throws java.lang.UnsupportedOperationException If this
   *          operation is not supported
   *  @throws WebServiceException If an error occurs when using the supplied
   *     JAXBContext to marshall the payload. The cause of
   *     the WebServiceException is the original JAXBException.
  **/
  public void setPayload(Object payload, JAXBContext context);
}