/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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/**
 * MODULE NOTES:
 * @created  kmcclusk 10/19/99
 * 
 */

#ifndef nsIFormProcessor_h__
#define nsIFormProcessor_h__

#include "nsISupports.h"
#include "prtypes.h"

#include "nsIDOMHTMLInputElement.h"

class nsString;
class nsVoidArray;

// {0ae53c0f-8ea2-4916-bedc-717443c3e185}
#define NS_FORMPROCESSOR_CID \
{ 0x0ae53c0f, 0x8ea2, 0x4916, { 0xbe, 0xdc, 0x71, 0x74, 0x43, 0xc3, 0xe1, 0x85 } }

#define NS_FORMPROCESSOR_CONTRACTID "@mozilla.org/layout/form-processor;1"

// 4ff86376-6982-4f64-a683-a6ae4984afd7
#define NS_IFORMPROCESSOR_IID      \
{ 0x4ff86376, 0x6982, 0x4f64, { 0xa6, 0x83, 0xa6, 0xae, 0x49, 0x84, 0xaf, 0xd7 } }



// XXX:In the future, we should examine combining this interface with nsIFormSubmitObserver.
// nsIFormSubmitObserver could have a before, during, and after form submission methods.
// The before and after methods would be passed a nsISupports interface. The During would
// Have the same method signature as ProcessValue.


class nsIFormProcessor : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IFORMPROCESSOR_IID)

  /* ProcessValue is called for each name value pair that is 
   * about to be submitted for both "get" and "post" form submissions.
   *
   * The formprocessor is registered as a service that gets called for
   * every form submission.
   *
   *   @param aElement element which the attribute/value pair is submitted for
   *   @param aName    value of the form element name attribute about to be submitted
   *   @param aValue   On entry it contains the value about to be submitted for aName. 
   *                   On exit it contains the value which will actually be submitted for aName.
   *                   
   */
  NS_IMETHOD ProcessValue(nsIDOMHTMLElement *aElement, 
                          const nsAString& aName,
                          nsAString& aValue) = 0;

  /* Provide content for a form element. This method provides a mechanism to provide 
   * content which comes from a source other than the document (i.e. a local database)
   *  
   *   @param aFormType   Type of form to get content for.
   *   @param aOptions    List of nsStrings which define the contents for the form element
   *   @param aAttr       Attribute to be attached to the form element. It is used to identify
   *                      the form element contains non-standard content.
   */

  NS_IMETHOD ProvideContent(const nsAString& aFormType, 
                            nsVoidArray& aContent,
                            nsAString& aAttribute) = 0;

};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIFormProcessor, NS_IFORMPROCESSOR_IID)

#endif /* nsIFormProcessor_h__ */

