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object: add object_get_canonical_path_component() 

It is often useful to find an object's child property name.  Also use
this new function to simplify the implementation of
object_get_canonical_path().

Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2014-03-03 11:30:02 +01:00
parent b5042a3622
commit 11f590b1a2
2 changed files with 40 additions and 22 deletions
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8
include/qom/object.h
View File

@ -973,6 +973,14 @@ const char *object_property_get_type(Object *obj, const char *name,
*/
Object *object_get_root(void);
/**
* object_get_canonical_path_component:
*
* Returns: The final component in the object's canonical path. The canonical
* path is the path within the composition tree starting from the root.
*/
gchar *object_get_canonical_path_component(Object *obj);
/**
* object_get_canonical_path:
*

54
qom/object.c
View File

@ -1102,39 +1102,49 @@ void object_property_add_link(Object *obj, const char *name,
g_free(full_type);
}
gchar *object_get_canonical_path_component(Object *obj)
{
ObjectProperty *prop = NULL;
g_assert(obj);
g_assert(obj->parent != NULL);
QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
if (!object_property_is_child(prop)) {
continue;
}
if (prop->opaque == obj) {
return g_strdup(prop->name);
}
}
/* obj had a parent but was not a child, should never happen */
g_assert_not_reached();
return NULL;
}
gchar *object_get_canonical_path(Object *obj)
{
Object *root = object_get_root();
char *newpath = NULL, *path = NULL;
char *newpath, *path = NULL;
while (obj != root) {
ObjectProperty *prop = NULL;
char *component = object_get_canonical_path_component(obj);
g_assert(obj->parent != NULL);
QTAILQ_FOREACH(prop, &obj->parent->properties, node) {
if (!object_property_is_child(prop)) {
continue;
}
if (prop->opaque == obj) {
if (path) {
newpath = g_strdup_printf("%s/%s", prop->name, path);
g_free(path);
path = newpath;
} else {
path = g_strdup(prop->name);
}
break;
}
if (path) {
newpath = g_strdup_printf("%s/%s", component, path);
g_free(component);
g_free(path);
path = newpath;
} else {
path = component;
}
g_assert(prop != NULL);
obj = obj->parent;
}
newpath = g_strdup_printf("/%s", path);
newpath = g_strdup_printf("/%s", path ? path : "");
g_free(path);
return newpath;