nsIFaviconService Interface Reference

import "nsIFaviconService.idl";

List of all members.

Public Member Functions
void	setFaviconUrlForPage (in nsIURI aPageURI, in nsIURI aFaviconURI)
void	setAndLoadFaviconForPage (in nsIURI aPageURI, in nsIURI aFaviconURI, in boolean aForceReload)
void	setFaviconData (in nsIURI aFaviconURI,[const, array, size_is(aDataLen)] in octet aData, in unsigned long aDataLen, in AUTF8String aMimeType, in PRTime aExpiration)
void	setFaviconDataFromDataURL (in nsIURI aFaviconURI, in AString aDataURL, in PRTime aExpiration)
void	getFaviconData (in nsIURI aFaviconURI, out AUTF8String aMimeType, out unsigned long aDataLen,[array, retval, size_is(aDataLen)] out octet aData)
AString	getFaviconDataAsDataURL (in nsIURI aFaviconURI)
nsIURI	getFaviconForPage (in nsIURI aPageURI)
nsIURI	getFaviconImageForPage (in nsIURI aPageURI)
nsIURI	getFaviconLinkForIcon (in nsIURI aFaviconURI)
void	addFailedFavicon (in nsIURI aFaviconURI)
void	removeFailedFavicon (in nsIURI aFaviconURI)
boolean	isFailedFavicon (in nsIURI aFaviconURI)
Public Attributes
readonly attribute nsIURI	defaultFavicon

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Detailed Description

Definition at line 44 of file nsIFaviconService.idl.

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Member Function Documentation

void nsIFaviconService::addFailedFavicon

(

in nsIURI

aFaviconURI

)

Adds a given favicon's URI to the failed favicon cache.

The lifespan of the favicon cache is up to the caching system. This cache will also be written to if you use setAndLoadFaviconForPage and it encounters an error.

See also:

isFailedFavicon

void nsIFaviconService::getFaviconData	(	in nsIURI	aFaviconURI,
		out AUTF8String	aMimeType,
		out unsigned long	aDataLen,
		[array, retval, size_is(aDataLen)] out octet	aData
	)

Retrieves the given favicon data. Throws if we don't have data.

If there is no data but we have an entry for this favicon, aDataLen will be 0 and aData will be NULL.

Parameters:

	aFaviconURI	URI of the favicon whose data is being read
	aData	Output parameter where the binary favicon data will be placed. This will be null if we have this URI but have no data associated with it.
	aDataLen	Output parameter where the size of the binary data will be placed.
	aMimeType	Output parameter where the MIME type will be placed.

Exceptions:

NS_ERROR_NOT_AVAILABLE

Thrown when we have never heard of this favicon URI.

AString nsIFaviconService::getFaviconDataAsDataURL

(

in nsIURI

aFaviconURI

)

Retrieves the given favicon data as a data URL. Throws if we don't have data.

If there is no data but we have an entry for this favicon, the return value will be NULL.

See also:

getFaviconData

Parameters:

aFaviconURI

URI of the favicon whose data is being read

Returns:

A data URL containing the data of the favicon. This will be null if we have this URL but have no data associated with it.

Exceptions:

NS_ERROR_NOT_AVAILABLE

Thrown when we have never heard of this favicon URL.

nsIURI nsIFaviconService::getFaviconForPage

(

in nsIURI

aPageURI

)

Retrieves the URI of the favicon for the given page.

Parameters:

aPageURI

URI of the page whose favicon is desired

Returns:

The URI of the favicon associated with that page. Returning a URI here does NOT mean that we have data for this favicon, only that we know what the favicon should be.

Exceptions:

NS_ERROR_NOT_AVAILABLE

When the page is not found or it has no favicon.

nsIURI nsIFaviconService::getFaviconImageForPage

(

in nsIURI

aPageURI

)

For a given page, this will give you a URI that, when displayed in chrome, will result in the given page's favicon. Unlike the other get functions, we needn't have heard of the page or its favicon: the default one will be returned in this case.

See also:

getFaviconLinkForIcon This function only adds the extra level of indirection, looking up the favicon based on the page URI and using the default if not found.

Parameters:

aPageURI

URI of the page whose favicon is desired

Returns:

A URI that will give you the icon image. This is NOT the URI of the icon as set on the page, but a URI that will give you the data out of the favicon service. For a normal page with a favicon we've stored, this will be an annotation URI which will then cause the corresponding favicon data to be loaded from this service. For pages where we don't have a favicon, this will be a chrome URI of the default icon for a web page.

nsIURI nsIFaviconService::getFaviconLinkForIcon

(

in nsIURI

aFaviconURI

)

For a given icon URI, this will return a URI that will result in the image. In most cases, this is an annotation URI. For chrome, this will do nothing and return the input URI. For NULL input, this will return the URI of the default favicon.

Parameters:

aFaviconURI

The URI of an icon in the favicon service. Can be NULL.

Returns:

A URI that will load the desired icon. This is NOT the URI of the icon as set on the page, but a URI that will give you the data out of the favicon service. For a normal page with a favicon we've stored, this will be an annotation URI which will then cause the corresponding favicon data to be loaded from this service. For pages where we don't have a favicon, this will be a chrome URI of the default icon for a web page. For chrome, the output will be the same as the input. For NULL input, this will be the URI of the default favicon.

No validity checking is done. If you pass an icon URI that we've never seen, you'll get back a URI that references an invalid icon. The moz-anno protocol handler's special case for "favicon" annotations will detect most invalid icons and it will resolve to the default icon, although without caching. For invalid chrome URIs, you'll get a broken image.

boolean nsIFaviconService::isFailedFavicon

(

in nsIURI

aFaviconURI

)

Checks to see if this favicon is in the failed favicon cache. Returns true if the favicon is in the failed cache, meaning you probably shouldn't try to load it. A false return value means that it's worth trying to load it. This allows you to avoid trying to load "foo.com/favicon.ico" for every page on a site that doesn't have a favicon.

void nsIFaviconService::removeFailedFavicon

(

in nsIURI

aFaviconURI

)

Removes the given favicon from the failed favicon cache. If the icon is not in the cache, this function will silently succeed.

void nsIFaviconService::setAndLoadFaviconForPage	(	in nsIURI	aPageURI,
		in nsIURI	aFaviconURI,
		in boolean	aForceReload
	)

Same as SetFaviconUrlForPage except that this also attempts to set the data by loading the favicon URI. An async request will be created for this URI and if the data is available, it will asynchronously get saved in the database without any further work from the caller.

If the icon data already exists, we won't normally try to re-load the icon from the net (or more likely the cache). If the icon is in the failed favicon cache we won't do anything. Use forceReload to force a reload of the data. This will remove the favicon from the failed cache. If it then fails again, it will be re-added to the failed cache.

SetFaviconUrlForPage and SetFaviconData will take any URI you provide and save it. This function is intended for automatic usage, and will only save favicons for "good" URIs, as defined by what gets added to history. For "bad" URIs, this function will succeed and do nothing. This function will also ignore the error page favicon URI (chrome://global/skin/icons/warning-16.png). Icons that fail to load will automatically be added to the failed favicon cache.

This function will not save favicons for non-bookmarked URIs when history is disabled (expiration time is 0 days). The rest of the functions here will always store favicons even when history is disabled.

Parameters:

	aPageURI	URI of the page whose favicon is being set.
	aFaviconURI	URI of the favicon to associate with the page.
	aForceReload	Unset is normal behavior, we will only try to reload the favicon if we don't have it or if it has expired from the cache. If set, it will always try to reload the favicon.

void nsIFaviconService::setFaviconData	(	in nsIURI	aFaviconURI,
		[const, array, size_is(aDataLen)] in octet	aData,
		in unsigned long	aDataLen,
		in AUTF8String	aMimeType,
		in PRTime	aExpiration
	)

Stores the data of a given favicon. You must specify the MIME type unless you're clearing the data.

You can set the data even if you haven't called SetFaviconUrlForPage yet. It will be stored but will not be associated with any page. However, any favicons not associated with a visited web page, bookmark, or "place:" URI will be expired when history cleanup is done. This might be done at any time on a timer, so you should not let the message loop run between calls or your icon may get deleted.

It is best to set the favicon data, and then associate it with a page. This will make the notifications more efficient since the icon will already have data when the set favicon observer messages goes out.

The expiration time is stored. This will be used if you call SetAndLoadFaviconForPage to see whether the data needs reloading.

Do not use this function for chrome: icon URIs. You should reference the chrome image yourself. The GetFaviconLinkForIcon/Page will ignore any associated data if the favicon URI is "chrome:" and just return the same chrome URI.

This function does NOT send out notifications that the data has changed. Potentially, many pages could be referencing the favicon and they could be visible in a history view or toolbar. But sending out those notifications is very intensive. Those pages will keep the old icon until they have been refreshed by other means.

This function tries to optimize the favicon size, if it is bigger than defined limit we will try to convert it to a 16x16 png image. If the conversion fails and favicon is bigger than our max accepted favicon size we will fail and the favicon won't be saved.

Parameters:

	aFaviconURI	URI of the favicon whose data is being set.
	aData	Binary contents of the favicon to save
	aDataLength	Length of binary data
	aMimeType	MIME type of the data to store. This is important so that we know what to report when the favicon is used.
	aExpiration	Time in microseconds since the epoch when this favicon expires. Until this time, we won't try to load it again.

Exceptions:

NS_ERROR_FAILURE

Thrown if the favicon is overbloated and won't be saved to the db.

void nsIFaviconService::setFaviconDataFromDataURL	(	in nsIURI	aFaviconURI,
		in AString	aDataURL,
		in PRTime	aExpiration
	)

Stores the data of a given favicon. The data is provided by a string containing a data URL.

This function tries to optimize the favicon size, if it is bigger than defined limit we will try to convert it to a 16x16 png image. If the conversion fails and favicon is bigger than our max accepted favicon size we will fail and the favicon won't be saved.

See also:

setFaviconData

Parameters:

	aFaviconURI	URI of the favicon whose data is being set.
	aDataURL	string containing a data URL that represents the contents of the favicon to save
	aExpiration	Time in microseconds since the epoch when this favicon expires. Until this time, we won't try to load it again.

Exceptions:

NS_ERROR_FAILURE

Thrown if the favicon is overbloated and won't be saved to the db.

void nsIFaviconService::setFaviconUrlForPage	(	in nsIURI	aPageURI,
		in nsIURI	aFaviconURI
	)

Declares that a given page uses a favicon with the given URI.

You needn't have specified any data at this point. An entry linking the favicon with the page will be create with no data. You can populate it later with SetFaviconData. However, any favicons not associated with a visited web page, a bookmark, or a "place:" URI will be expired when history cleanup is done * (typically at app shutdown, but also possibly if the user clears their * cache or history).

This will send out history notifications if the new favicon has any data. This means that you should try to set data first if you have it, otherwise the page might not get a notification sent for it since data setting does not send notifications.

Parameters:

	aPageURI	URI of the page whose favicon is being set.
	aFaviconURI	URI of the favicon to associate with the page.

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Member Data Documentation

readonly attribute nsIURI nsIFaviconService::defaultFavicon

The default favicon URI

Definition at line 316 of file nsIFaviconService.idl.

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The documentation for this interface was generated from the following file:

• /Users/dietrich/moz/trunk/mozilla/toolkit/components/places/public/nsIFaviconService.idl