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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * 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) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dan Mosedale <dmose@netscape.com> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * 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"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"

interface nsIAutoCompleteItem;
interface nsILDAPMessage;

/**
 * An interface to allow different users of nsILDAPAutoCompleteSession to 
 * format each nsILDAPMessage into an nsIAutoCompleteItem as it sees fit.
 */
[scriptable, uuid(cbec617c-22d2-4286-8308-0ef8bf57c0ce)]
interface nsILDAPAutoCompFormatter : nsISupports {
    
    /**
     * Returns an nsIAutoCompleteItem generated from the data in 
     * the given nsILDAPMessage.
     *
     * @param aMessage  message to be formatted
     * @return          resulting nsIAutoCompleteItem
     */
    nsIAutoCompleteItem format(in nsILDAPMessage aMessage);

    /**
     * Gets a list of all the LDAP attributes that should be requested
     * from the LDAP server when a lookup is done.  This avoids
     * wasting server time, bandwidth, and client time processing
     * unused attributes.
     *
     * Note that this is only required to be called by the
     * nsILDAPAutoCompleteSession implementation when the
     * nsILDAPAutoCompleteSession::formatter IDL attribute is set.  .
     * So if for some reason, the LDAP attributes to be returned by
     * searches has to change (eg because the user changed a
     * preference), the nsILDAPAutoCompleteSession::formatter IDL
     * attribute should be re-set to the same object to force a new
     * getAttributes() call.
     * 
     * @param aCount    number of attributes in the array
     * @param aAttrs    list of LDAP attributes to request
     */
    void getAttributes(out unsigned long aCount, 
                       [retval, array, size_is(aCount)] out string aAttrs);

    /** 
     * This method formats an error condition into an nsIAutoCompleteItem
     * for display to the user.  Specifically, the state that the session
     * was in when the error occured (aState) is formatted into a general
     * error message which is put in the value attribute of the item,
     * and the specific error (aErrorCode) is formatted into another message
     * which is put in an nsISupportsString in the param attribute of the
     * item.
     *
     * @param aState        state of autocomplete session when error occurred
     * @param aErrorCode    specific error encountered
     *
     * @return              newly generated item
     */
    nsIAutoCompleteItem formatException(in long aState, 
                                        in nsresult aErrorCode);

    /**
     *  Possible states that can be passed in aState to formatException
     */
    const long STATE_UNBOUND = 0;
    const long STATE_INITIALIZING = 1;
    const long STATE_BINDING = 2;
    const long STATE_BOUND = 3;
    const long STATE_SEARCHING = 4;

};