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118 lines
5.0 KiB
Plaintext
118 lines
5.0 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsIHandlerInfo;
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interface nsISimpleEnumerator;
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[scriptable, uuid(53f0ad17-ec62-46a1-adbc-efccc06babcd)]
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interface nsIHandlerService : nsISupports
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{
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/**
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* Retrieve a list of all handlers in the datastore. This list is not
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* guaranteed to be in any particular order, and callers should not assume
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* it will remain in the same order in the future.
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*
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* @returns a list of all handlers in the datastore
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*/
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nsISimpleEnumerator enumerate();
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/**
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* Fill a handler info object with information from the datastore.
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*
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* Note: because of the way the external helper app service currently mixes
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* OS and user handler info in the same handler info object, this method
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* takes an existing handler info object (probably retrieved from the OS)
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* and "fills it in" with information from the datastore, overriding any
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* existing properties on the object with properties from the datastore.
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*
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* Ultimately, however, we're going to separate OS and user handler info
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* into separate objects, at which point this method should be renamed to
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* something like "get" or "retrieve", take a class and type (or perhaps
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* a type whose class can be determined by querying the type, for example
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* an nsIContentType which is also an nsIMIMEType or an nsIProtocolScheme),
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* and return a handler info object representing only the user info.
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*
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* Note: if you specify an override type, then the service will fill in
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* the handler info object with information about that type instead of
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* the type specified by the object's nsIHandlerInfo::type attribute.
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*
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* This is useful when you are trying to retrieve information about a MIME
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* type that doesn't exist in the datastore, but you have a file extension
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* for that type, and nsIHandlerService::getTypeFromExtension returns another
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* MIME type that does exist in the datastore and can handle that extension.
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*
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* For example, the user clicks on a link, and the content has a MIME type
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* that isn't in the datastore, but the link has a file extension, and that
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* extension is associated with another MIME type in the datastore (perhaps
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* an unofficial MIME type preceded an official one, like with image/x-png
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* and image/png).
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*
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* In that situation, you can call this method to fill in the handler info
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* object with information about that other type by passing the other type
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* as the aOverrideType parameter.
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*
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* @param aHandlerInfo the handler info object
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* @param aOverrideType a type to use instead of aHandlerInfo::type
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*
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* Note: if there is no information in the datastore about this type,
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* this method throws NS_ERROR_NOT_AVAILABLE. Callers are encouraged to
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* check exists() before calling fillHandlerInfo(), to prevent spamming the
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* console with XPCOM exception errors.
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*/
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void fillHandlerInfo(in nsIHandlerInfo aHandlerInfo,
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in ACString aOverrideType);
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/**
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* Save the preferred action, preferred handler, possible handlers, and
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* always ask properties of the given handler info object to the datastore.
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* Updates an existing record or creates a new one if necessary.
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*
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* Note: if preferred action is undefined or invalid, then we assume
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* the default value nsIHandlerInfo::useHelperApp.
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*
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* @param aHandlerInfo the handler info object
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*/
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void store(in nsIHandlerInfo aHandlerInfo);
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/**
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* Whether or not a record for the given handler info object exists
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* in the datastore. If the datastore is corrupt (or some other error
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* is caught in the implementation), false will be returned.
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*
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* @param aHandlerInfo a handler info object
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*
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* @returns whether or not a record exists
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*/
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boolean exists(in nsIHandlerInfo aHandlerInfo);
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/**
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* Remove the given handler info object from the datastore. Deletes all
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* records associated with the object, including the preferred handler, info,
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* and type records plus the entry in the list of types, if they exist.
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* Otherwise, it does nothing and does not return an error.
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*
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* @param aHandlerInfo the handler info object
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*/
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void remove(in nsIHandlerInfo aHandlerInfo);
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/**
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* Get the MIME type mapped to the given file extension in the datastore.
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*
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* XXX If we ever support extension -> protocol scheme mappings, then this
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* method should work for those as well.
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*
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* Note: in general, you should use nsIMIMEService::getTypeFromExtension
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* to get a MIME type from a file extension, as that method checks a variety
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* of other sources besides just the datastore. Use this only when you want
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* to specifically get only the mapping available in the datastore.
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*
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* @param aFileExtension the file extension
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*
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* @returns the MIME type, if any; otherwise returns an empty string ("").
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*/
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ACString getTypeFromExtension(in ACString aFileExtension);
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};
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