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#ifndef nsIFormSubmission_h___
#define nsIFormSubmission_h___

#include "nsISupports.h"
class nsAString;
class nsACString;
class nsIURI;
class nsIInputStream;
class nsIHTMLContent;
class nsIPresContext;
class nsIContent;
class nsIFormControl;
class nsIDOMHTMLElement;
class nsIDocShell;
class nsIRequest;

#define NS_IFORMSUBMISSION_IID   \
{ 0x7ee38e3a, 0x1dd2, 0x11b2, \
  {0x89, 0x6f, 0xab, 0x28, 0x03, 0x96, 0x25, 0xa9} }

/**
 * Interface for form submissions; encompasses the function to call to submit as
 * well as the form submission name/value pairs
 */
class nsIFormSubmission : public nsISupports
{
public:

  NS_DEFINE_STATIC_IID_ACCESSOR(NS_IFORMSUBMISSION_IID)

  /**
   * Find out whether or not this form submission accepts files
   *
   * @param aAcceptsFiles the boolean output
   */
  virtual PRBool AcceptsFiles() const = 0;

  /**
   * Call to perform the submission
   *
   * @param aActionURL the URL to submit to (may be modified with GET contents)
   * @param aTarget the target window
   * @param aSource the element responsible for the submission (for web shell)
   * @param aPresContext the presentation context
   * @param aDocShell (out param) the DocShell in which the submission was
   *        loaded
   * @param aRequest (out param) the Request for the submission
   */
  virtual nsresult SubmitTo(nsIURI* aActionURL, const nsAString& aTarget,
                            nsIContent* aSource, nsIPresContext* aPresContext,
                            nsIDocShell** aDocShell,
                            nsIRequest** aRequest) = 0;

  /**
   * Submit a name/value pair
   *
   * @param aSource the control sending the parameter
   * @param aName the name of the parameter
   * @param aValue the value of the parameter
   */
  virtual nsresult AddNameValuePair(nsIDOMHTMLElement* aSource,
                                    const nsAString& aName,
                                    const nsAString& aValue) = 0;

  /**
   * Submit a name/file pair
   *
   * @param aSource the control sending the parameter
   * @param aName the name of the parameter
   * @param aFilename the name of the file (pass null to provide no name)
   * @param aStream the stream containing the file data to be sent
   * @param aContentType the content-type of the file data being sent
   * @param aMoreFilesToCome true if another name/file pair with the same name
   *        will be sent soon
   */
  virtual nsresult AddNameFilePair(nsIDOMHTMLElement* aSource,
                               const nsAString& aName,
                               const nsAString& aFilename,
                               nsIInputStream* aStream,
                               const nsACString& aContentType,
                               PRBool aMoreFilesToCome) = 0;

};

//
// Factory methods
// 

/**
 * Get a submission object based on attributes in the form (ENCTYPE and METHOD)
 *
 * @param aForm the form to get a submission object based on
 * @param aPresContext the presentation context
 * @param aFormSubmission the form submission object (out param)
 */
nsresult GetSubmissionFromForm(nsIHTMLContent* aForm,
                               nsIPresContext* aPresContext,
                               nsIFormSubmission** aFormSubmission);


#endif /* nsIFormSubmission_h___ */
