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382 lines
15 KiB
Plaintext
382 lines
15 KiB
Plaintext
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsIVariant;
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interface nsIContentPrefObserver;
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interface nsIContentPrefCallback2;
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interface nsILoadContext;
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interface nsIContentPref;
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/**
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* Content Preferences
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*
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* Content preferences allow the application to associate arbitrary data, or
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* "preferences", with specific domains, or web "content". Specifically, a
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* content preference is a structure with three values: a domain with which the
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* preference is associated, a name that identifies the preference within its
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* domain, and a value. (See nsIContentPref below.)
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*
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* For example, if you want to remember the user's preference for a certain zoom
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* level on www.mozilla.org pages, you might store a preference whose domain is
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* "www.mozilla.org", whose name is "zoomLevel", and whose value is the numeric
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* zoom level.
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*
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* A preference need not have a domain, and in that case the preference is
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* called a "global" preference. This interface doesn't impart any special
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* significance to global preferences; they're simply name-value pairs that
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* aren't associated with any particular domain. As a consumer of this
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* interface, you might choose to let a global preference override all non-
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* global preferences of the same name, for example, for whatever definition of
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* "override" is appropriate for your use case.
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*
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*
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* Domain Parameters
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*
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* Many methods of this interface accept a "domain" parameter. Domains may be
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* specified either exactly, like "example.com", or as full URLs, like
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* "http://example.com/foo/bar". In the latter case the API extracts the full
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* domain from the URL, so if you specify "http://foo.bar.example.com/baz", the
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* domain is taken to be "foo.bar.example.com", not "example.com".
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*
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*
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* Private-Browsing Context Parameters
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*
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* Many methods also accept a "context" parameter. This parameter relates to
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* private browsing and determines the kind of storage that a method uses,
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* either the usual permanent storage or temporary storage set aside for private
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* browsing sessions.
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*
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* Pass null to unconditionally use permanent storage. Pass an nsILoadContext
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* to use storage appropriate to the context's usePrivateBrowsing attribute: if
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* usePrivateBrowsing is true, temporary private-browsing storage is used, and
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* otherwise permanent storage is used. A context can be obtained from the
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* window or channel whose content pertains to the preferences being modified or
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* retrieved.
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*
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*
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* Callbacks
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*
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* The methods of callback objects are always called asynchronously.
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*
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* Observers are called after callbacks are called, but they are called in the
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* same turn of the event loop as callbacks.
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*
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* See nsIContentPrefCallback2 below for more information about callbacks.
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*/
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[scriptable, uuid(133608c7-f812-41ca-bc1c-62a4eb95e52a)]
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interface nsIContentPrefService2 : nsISupports
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{
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/**
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* Gets the preference with the given domain and name.
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*
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* @param domain The preference's domain.
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @param callback handleResult is called once unless no such preference
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* exists, in which case handleResult is not called at all.
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*/
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void getByDomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context,
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in nsIContentPrefCallback2 callback);
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/**
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* Gets all preferences with the given name whose domains are either the same
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* as or subdomains of the given domain.
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*
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* @param domain The preferences' domain.
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* @param name The preferences' name.
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* @param context The private-browsing context, if any.
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* @param callback handleResult is called once for each preference. If no
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* such preferences exist, handleResult is not called at all.
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*/
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void getBySubdomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context,
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in nsIContentPrefCallback2 callback);
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/**
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* Gets the preference with no domain and the given name.
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*
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @param callback handleResult is called once unless no such preference
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* exists, in which case handleResult is not called at all.
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*/
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void getGlobal(in AString name,
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in nsILoadContext context,
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in nsIContentPrefCallback2 callback);
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/**
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* Synchronously retrieves from the in-memory cache the preference with the
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* given domain and name.
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*
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* In addition to caching preference values, the cache also keeps track of
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* preferences that are known not to exist. If the preference is known not to
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* exist, the value attribute of the returned object will be undefined
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* (nsIDataType::VTYPE_VOID).
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*
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* If the preference is neither cached nor known not to exist, then null is
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* returned, and get() must be called to determine whether the preference
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* exists.
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*
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* @param domain The preference's domain.
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @return The preference, or null if no such preference is known to
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* exist.
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*/
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nsIContentPref getCachedByDomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context);
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/**
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* Synchronously retrieves from the in-memory cache all preferences with the
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* given name whose domains are either the same as or subdomains of the given
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* domain.
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*
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* The preferences are returned in an array through the out-parameter. If a
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* preference for a particular subdomain is known not to exist, then an object
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* corresponding to that preference will be present in the array, and, as with
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* getCachedByDomainAndName, its value attribute will be undefined.
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*
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* @param domain The preferences' domain.
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* @param name The preferences' name.
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* @param context The private-browsing context, if any.
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* @param len The length of the returned array.
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* @param prefs The array of preferences.
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*/
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void getCachedBySubdomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context,
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out unsigned long len,
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[retval,array,size_is(len)] out nsIContentPref prefs);
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/**
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* Synchronously retrieves from the in-memory cache the preference with no
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* domain and the given name.
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*
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* As with getCachedByDomainAndName, if the preference is cached then it is
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* returned; if the preference is known not to exist, then the value attribute
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* of the returned object will be undefined; if the preference is neither
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* cached nor known not to exist, then null is returned.
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*
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @return The preference, or null if no such preference is known to
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* exist.
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*/
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nsIContentPref getCachedGlobal(in AString name,
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in nsILoadContext context);
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/**
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* Sets a preference.
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*
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* @param domain The preference's domain.
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* @param name The preference's name.
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* @param value The preference's value.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the preference has been
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* stored.
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*/
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void set(in AString domain,
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in AString name,
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in nsIVariant value,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Sets a preference with no domain.
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*
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* @param name The preference's name.
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* @param value The preference's value.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the preference has been
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* stored.
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*/
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void setGlobal(in AString name,
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in nsIVariant value,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes the preference with the given domain and name.
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*
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* @param domain The preference's domain.
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeByDomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all the preferences with the given name whose domains are either
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* the same as or subdomains of the given domain.
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*
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* @param domain The preferences' domain.
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* @param name The preferences' name.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeBySubdomainAndName(in AString domain,
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in AString name,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes the preference with no domain and the given name.
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*
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* @param name The preference's name.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeGlobal(in AString name,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all preferences with the given domain.
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*
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* @param domain The preferences' domain.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeByDomain(in AString domain,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all preferences whose domains are either the same as or subdomains
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* of the given domain.
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*
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* @param domain The preferences' domain.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeBySubdomain(in AString domain,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all preferences with the given name regardless of domain, including
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* global preferences with the given name.
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*
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* @param name The preferences' name.
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeByName(in AString name,
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in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all non-global preferences -- in other words, all preferences that
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* have a domain.
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*
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeAllDomains(in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Removes all global preferences -- in other words, all preferences that have
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* no domain.
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*
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* @param context The private-browsing context, if any.
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* @param callback handleCompletion is called when the operation completes.
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*/
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void removeAllGlobals(in nsILoadContext context,
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[optional] in nsIContentPrefCallback2 callback);
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/**
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* Registers an observer that will be notified whenever a preference with the
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* given name is set or removed.
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*
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* When a set or remove method is called, observers are called after the set
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* or removal completes and after the method's callback is called, and they
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* are called in the same turn of the event loop as the callback.
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*
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* The service holds a strong reference to the observer, so the observer must
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* be removed later to avoid leaking it.
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*
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* @param name The name of the preferences to observe. Pass null to
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* observe all preference changes regardless of name.
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* @param observer The observer.
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*/
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void addObserverForName(in AString name,
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in nsIContentPrefObserver observer);
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/**
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* Unregisters an observer for the given name.
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*
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* @param name The name for which the observer was registered. Pass null
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* if the observer was added with a null name.
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* @param observer The observer.
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*/
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void removeObserverForName(in AString name,
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in nsIContentPrefObserver observer);
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/**
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* Extracts and returns the domain from the given string representation of a
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* URI. This is how the API extracts domains from URIs passed to it.
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*
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* @param str The string representation of a URI, like
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* "http://example.com/foo/bar".
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* @return If the given string is a valid URI, the domain of that URI is
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* returned. Otherwise, the string itself is returned.
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*/
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AString extractDomain(in AString str);
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};
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/**
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* The callback used by the above methods.
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*/
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[scriptable, uuid(1a12cf41-79e8-4d0f-9899-2f7b27c5d9a1)]
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interface nsIContentPrefCallback2 : nsISupports
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{
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/**
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* For the retrieval methods, this is called once for each retrieved
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* preference. It is not called for other methods.
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*
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* @param pref The retrieved preference.
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*/
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void handleResult(in nsIContentPref pref);
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/**
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* Called when an error occurs. This may be called multiple times before
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* handleCompletion is called.
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*
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* @param error A number in Components.results describing the error.
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*/
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void handleError(in nsresult error);
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/**
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* Called when the method finishes. This will be called exactly once for
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* each method invocation, and afterward no other callback methods will be
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* called.
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*
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* @param reason One of the COMPLETE_* values indicating the manner in which
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* the method completed.
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*/
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void handleCompletion(in unsigned short reason);
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const unsigned short COMPLETE_OK = 0;
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const unsigned short COMPLETE_ERROR = 1;
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};
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[scriptable, function, uuid(9f24948d-24b5-4b1b-b554-7dbd58c1d792)]
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interface nsIContentPref : nsISupports
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{
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readonly attribute AString domain;
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readonly attribute AString name;
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readonly attribute nsIVariant value;
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};
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