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