From 64607d088132abdb25bf30d93e97d0c8df7b364c Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 5 Jun 2014 13:11:51 +0200 Subject: qom: add a generic mechanism to resolve paths It may be desirable to have custom link<> properties that do more than just store an object. Even the addition of a "check" function is not enough if setting the link has side effects or if a non-standard reference counting is preferrable. Avoid the assumption that the opaque field of a link<> is a LinkProperty struct, by adding a generic "resolve" callback to ObjectProperty. This fixes aliases of link properties. Signed-off-by: Paolo Bonzini --- include/qom/object.h | 34 +++++++++++++++++++++++++++++----- 1 file changed, 29 insertions(+), 5 deletions(-) (limited to 'include/qom/object.h') diff --git a/include/qom/object.h b/include/qom/object.h index 44c513f985..8a05a81a99 100644 --- a/include/qom/object.h +++ b/include/qom/object.h @@ -303,6 +303,25 @@ typedef void (ObjectPropertyAccessor)(Object *obj, const char *name, Error **errp); +/** + * ObjectPropertyResolve: + * @obj: the object that owns the property + * @opaque: the opaque registered with the property + * @part: the name of the property + * + * Resolves the #Object corresponding to property @part. + * + * The returned object can also be used as a starting point + * to resolve a relative path starting with "@part". + * + * Returns: If @path is the path that led to @obj, the function + * returns the #Object corresponding to "@path/@part". + * If "@path/@part" is not a valid object path, it returns #NULL. + */ +typedef Object *(ObjectPropertyResolve)(Object *obj, + void *opaque, + const char *part); + /** * ObjectPropertyRelease: * @obj: the object that owns the property @@ -321,6 +340,7 @@ typedef struct ObjectProperty gchar *type; ObjectPropertyAccessor *get; ObjectPropertyAccessor *set; + ObjectPropertyResolve *resolve; ObjectPropertyRelease *release; void *opaque; @@ -787,12 +807,16 @@ void object_unref(Object *obj); * destruction. This may be NULL. * @opaque: an opaque pointer to pass to the callbacks for the property * @errp: returns an error if this function fails + * + * Returns: The #ObjectProperty; this can be used to set the @resolve + * callback for child and link properties. */ -void object_property_add(Object *obj, const char *name, const char *type, - ObjectPropertyAccessor *get, - ObjectPropertyAccessor *set, - ObjectPropertyRelease *release, - void *opaque, Error **errp); +ObjectProperty *object_property_add(Object *obj, const char *name, + const char *type, + ObjectPropertyAccessor *get, + ObjectPropertyAccessor *set, + ObjectPropertyRelease *release, + void *opaque, Error **errp); void object_property_del(Object *obj, const char *name, Error **errp); -- cgit v1.2.3