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/* 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"

[scriptable, uuid (c5f583f0-ae53-4e39-8af9-2c2d0d7af093)]
interface nsICacheInfoChannel : nsISupports
{
  /**
   * Get expiration time from cache token. This attribute is equivalent to
   * nsICachingChannel.cacheToken.expirationTime.
   */
  readonly attribute uint32_t cacheTokenExpirationTime;

  /**
   * Set/get charset of cache entry. Accessing this attribute is equivalent to
   * calling nsICachingChannel.cacheToken.getMetaDataElement("charset") and
   * nsICachingChannel.cacheToken.setMetaDataElement("charset").
   */
  attribute ACString cacheTokenCachedCharset;

  /**
   * TRUE if this channel's data is being loaded from the cache.  This value
   * is undefined before the channel fires its OnStartRequest notification
   * and after the channel fires its OnStopRequest notification.
   */
  boolean isFromCache();

  /**
   * Set/get the cache key... uniquely identifies the data in the cache
   * for this channel.  Holding a reference to this key does NOT prevent
   * the cached data from being removed.
   *
   * A cache key retrieved from a particular instance of nsICacheInfoChannel
   * could be set on another instance of nsICacheInfoChannel provided the
   * underlying implementations are compatible and provided the new 
   * channel instance was created with the same URI.  The implementation of
   * nsICacheInfoChannel would be expected to use the cache entry identified
   * by the cache token.  Depending on the value of nsIRequest::loadFlags,
   * the cache entry may be validated, overwritten, or simply read.
   *
   * The cache key may be NULL indicating that the URI of the channel is
   * sufficient to locate the same cache entry.  Setting a NULL cache key
   * is likewise valid.
   */
  attribute nsISupports cacheKey;
};