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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface nsIFile;
interface nsISimpleEnumerator;

/**
 * nsIDirectoryServiceProvider
 *
 * Used by Directory Service to get file locations.
 */

[scriptable, uuid(bbf8cab0-d43a-11d3-8cc2-00609792278c)]
interface nsIDirectoryServiceProvider: nsISupports
{
 /**
  * getFile
  *
  * Directory Service calls this when it gets the first request for
  * a prop or on every request if the prop is not persistent.
  *
  * @param prop         The symbolic name of the file.
  * @param persistent   TRUE - The returned file will be cached by Directory
  *                     Service. Subsequent requests for this prop will
  *                     bypass the provider and use the cache.
  *                     FALSE - The provider will be asked for this prop
  *                     each time it is requested.
  *
  * @return             The file represented by the property.
  *
  */ 
  nsIFile getFile(in string prop, out boolean persistent);
};

/**
 * nsIDirectoryServiceProvider2
 *
 * An extension of nsIDirectoryServiceProvider which allows
 * multiple files to be returned for the given key.
 */

[scriptable, uuid(2f977d4b-5485-11d4-87e2-0010a4e75ef2)]
interface nsIDirectoryServiceProvider2: nsIDirectoryServiceProvider
{
 /**
  * getFiles
  *
  * Directory Service calls this when it gets a request for
  * a prop and the requested type is nsISimpleEnumerator.
  *
  * @param prop         The symbolic name of the file list.
  *
  * @return             An enumerator for a list of file locations.
  *                     The elements in the enumeration are nsIFile
  * @returnCode         NS_SUCCESS_AGGREGATE_RESULT if this result should be
  *                     aggregated with other "lower" providers.
  */
  nsISimpleEnumerator getFiles(in string prop);
};

/**
 * nsIDirectoryService
 */

[scriptable, uuid(57a66a60-d43a-11d3-8cc2-00609792278c)]
interface nsIDirectoryService: nsISupports
{
 /**
  * init
  *
  * Must be called. Used internally by XPCOM initialization.
  *
  */
  void init();

 /**
  * registerProvider
  *
  * Register a provider with the service.
  *
  * @param prov            The service will keep a strong reference
  *                        to this object. It will be released when
  *                        the service is released.
  *
  */  
  void registerProvider(in nsIDirectoryServiceProvider prov);
  
 /**
  * unregisterProvider
  *
  * Unregister a provider with the service.
  *
  * @param prov            
  *
  */  
  void unregisterProvider(in nsIDirectoryServiceProvider prov);
};