Re: [Qemu-devel] [PATCH v2 09/27] qom: add object_resolve_path_type

[Anthony Liguori <anthony@codemonkey.ws>]

On 02/04/2012 02:02 AM, Paolo Bonzini wrote:
> Signed-off-by: Paolo Bonzini<pbonzini@redhat.com>

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>

Regards,

Anthony Liguori

> ---
>   include/qemu/object.h |   25 +++++++++++++++++++++++--
>   qom/object.c          |   26 ++++++++++++++++++--------
>   2 files changed, 41 insertions(+), 10 deletions(-)
>
> diff --git a/include/qemu/object.h b/include/qemu/object.h
> index f36aff6..4ec7942 100644
> --- a/include/qemu/object.h
> +++ b/include/qemu/object.h
> @@ -773,14 +773,35 @@ gchar *object_get_canonical_path(Object *obj);
>    * specifying objects easy.  At each level of the composition tree, the partial
>    * path is matched as an absolute path.  The first match is not returned.  At
>    * least two matches are searched for.  A successful result is only returned if
> - * only one match is founded.  If more than one match is found, a flag is
> - * return to indicate that the match was ambiguous.
> + * only one match is found.  If more than one match is found, a flag is
> + * returned to indicate that the match was ambiguous.
>    *
>    * Returns: The matched object or NULL on path lookup failure.
>    */
>   Object *object_resolve_path(const char *path, bool *ambiguous);
>
>   /**
> + * object_resolve_path_type:
> + * @path: the path to resolve
> + * @typename: the type to look for.
> + * @ambiguous: returns true if the path resolution failed because of an
> + *   ambiguous match
> + *
> + * This is similar to object_resolve_path.  However, when looking for a
> + * partial path only matches that implement the given type are considered.
> + * This restricts the search and avoids spuriously flagging matches as
> + * ambiguous.
> + *
> + * For both partial and absolute paths, the return value goes through
> + * a dynamic cast to @typename.  This is important if either the link,
> + * or the typename itself are of interface types.
> + *
> + * Returns: The matched object or NULL on path lookup failure.
> + */
> +Object *object_resolve_path_type(const char *path, const char *typename,
> +                                 bool *ambiguous);
> +
> +/**
>    * object_property_add_child:
>    * @obj: the object to add a property to
>    * @name: the name of the property
> diff --git a/qom/object.c b/qom/object.c
> index 314fc7a..ea4a1f5 100644
> --- a/qom/object.c
> +++ b/qom/object.c
> @@ -947,17 +947,18 @@ gchar *object_get_canonical_path(Object *obj)
>
>   static Object *object_resolve_abs_path(Object *parent,
>                                             gchar **parts,
> +                                          const char *typename,
>                                             int index)
>   {
>       ObjectProperty *prop;
>       Object *child;
>
>       if (parts[index] == NULL) {
> -        return parent;
> +        return object_dynamic_cast(parent, typename);
>       }
>
>       if (strcmp(parts[index], "") == 0) {
> -        return object_resolve_abs_path(parent, parts, index + 1);
> +        return object_resolve_abs_path(parent, parts, typename, index + 1);
>       }
>
>       prop = object_property_find(parent, parts[index]);
> @@ -979,17 +980,18 @@ static Object *object_resolve_abs_path(Object *parent,
>           return NULL;
>       }
>
> -    return object_resolve_abs_path(child, parts, index + 1);
> +    return object_resolve_abs_path(child, parts, typename, index + 1);
>   }
>
>   static Object *object_resolve_partial_path(Object *parent,
>                                                 gchar **parts,
> +                                              const char *typename,
>                                                 bool *ambiguous)
>   {
>       Object *obj;
>       ObjectProperty *prop;
>
> -    obj = object_resolve_abs_path(parent, parts, 0);
> +    obj = object_resolve_abs_path(parent, parts, typename, 0);
>
>       QTAILQ_FOREACH(prop,&parent->properties, node) {
>           Object *found;
> @@ -998,7 +1000,8 @@ static Object *object_resolve_partial_path(Object *parent,
>               continue;
>           }
>
> -        found = object_resolve_partial_path(prop->opaque, parts, ambiguous);
> +        found = object_resolve_partial_path(prop->opaque, parts,
> +                                            typename, ambiguous);
>           if (found) {
>               if (obj) {
>                   if (ambiguous) {
> @@ -1017,7 +1020,8 @@ static Object *object_resolve_partial_path(Object *parent,
>       return obj;
>   }
>
> -Object *object_resolve_path(const char *path, bool *ambiguous)
> +Object *object_resolve_path_type(const char *path, const char *typename,
> +                                 bool *ambiguous)
>   {
>       bool partial_path = true;
>       Object *obj;
> @@ -1037,9 +1041,10 @@ Object *object_resolve_path(const char *path, bool *ambiguous)
>           if (ambiguous) {
>               *ambiguous = false;
>           }
> -        obj = object_resolve_partial_path(object_get_root(), parts, ambiguous);
> +        obj = object_resolve_partial_path(object_get_root(), parts,
> +                                          typename, ambiguous);
>       } else {
> -        obj = object_resolve_abs_path(object_get_root(), parts, 1);
> +        obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
>       }
>
>       g_strfreev(parts);
> @@ -1047,6 +1052,11 @@ Object *object_resolve_path(const char *path, bool *ambiguous)
>       return obj;
>   }
>
> +Object *object_resolve_path(const char *path, bool *ambiguous)
> +{
> +    return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
> +}
> +
>   typedef struct StringProperty
>   {
>       char *(*get)(Object *, Error **);