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[PATCH v2 3/5] qom: object_child_foreach_recursive_type()
From: |
Peter Xu |
Subject: |
[PATCH v2 3/5] qom: object_child_foreach_recursive_type() |
Date: |
Thu, 28 Oct 2021 12:31:27 +0800 |
Add this sister helper besides object_child_foreach_recursive() to loop over
child objects only if the object can be casted to a specific type.
Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
---
include/qom/object.h | 20 ++++++++++++++++++++
qom/object.c | 27 +++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/include/qom/object.h b/include/qom/object.h
index faae0d841f..355277db40 100644
--- a/include/qom/object.h
+++ b/include/qom/object.h
@@ -1926,6 +1926,26 @@ int object_child_foreach(Object *obj, int (*fn)(Object
*child, void *opaque),
int object_child_foreach_recursive(Object *obj,
int (*fn)(Object *child, void *opaque),
void *opaque);
+
+/**
+ * object_child_foreach_recursive_type:
+ * @obj: the object whose children will be navigated
+ * @type: the typename string to scan
+ * @fn: the iterator function to be called
+ * @opaque: an opaque value that will be passed to the iterator
+ *
+ * This is a special version of object_child_foreach_recursive() so that we
+ * only call the fn() if the child can be casted to the @typename specified.
+ * Please refer to the comments above object_child_foreach_recursive() for
+ * more details.
+ *
+ * Returns: The last value returned by @fn, or 0 if there is no child.
+ */
+int object_child_foreach_recursive_type(Object *obj,
+ const char *typename,
+ int (*fn)(Object *child, void *opaque),
+ void *opaque);
+
/**
* container_get:
* @root: root of the #path, e.g., object_get_root()
diff --git a/qom/object.c b/qom/object.c
index 6be710bc40..d25ca09b1d 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -1134,6 +1134,33 @@ int object_child_foreach_recursive(Object *obj,
return do_object_child_foreach(obj, fn, opaque, true);
}
+typedef struct {
+ const char *typename;
+ int (*fn)(Object *child, void *opaque);
+ void *opaque;
+} ObjectTypeArgs;
+
+static int object_child_hook(Object *child, void *opaque)
+{
+ ObjectTypeArgs *args = opaque;
+
+ if (object_dynamic_cast(child, args->typename)) {
+ return args->fn(child, args->opaque);
+ }
+
+ return 0;
+}
+
+int object_child_foreach_recursive_type(Object *obj,
+ const char *typename,
+ int (*fn)(Object *child, void *opaque),
+ void *opaque)
+{
+ ObjectTypeArgs args = { .typename = typename, .fn = fn, .opaque = opaque };
+
+ return object_child_foreach_recursive(obj, object_child_hook, &args);
+}
+
static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
{
GSList **list = opaque;
--
2.32.0