class StructureField(Field):
+ """
+ Structure field, based on a
+ :class:`StructureFieldDeclaration` object.
+ """
+
def field(self, field_name):
"""
- Get the structure's field corresponding to the provided field name.
+ Returns the structure :class:`Field` named *field_name*.
+
+ :exc:`ValueError` is raised on error.
"""
native_instance = nbt._bt_ctf_field_structure_get_field(self._f,
class VariantField(Field):
+ """
+ Variant field, based on a
+ :class:`VariantFieldDeclaration` object.
+ """
+
def field(self, tag):
"""
- Return the variant's selected field. The "tag" field is the selector enum field.
+ Returns the :class:`Field` selected by the current label of
+ *tag* (:class:`EnumerationField`).
+
+ :exc:`ValueError` is raised on error.
"""
native_instance = nbt._bt_ctf_field_variant_get_field(self._f, tag._f)
class ArrayField(Field):
+ """
+ Static array field, based on an
+ :class:`ArrayFieldDeclaration` object.
+ """
+
def field(self, index):
"""
- Return the array's field at position "index".
+ Returns the :class:`Field` at index *index* in this static
+ array.
+
+ :exc:`IndexError` is raised on error.
"""
native_instance = nbt._bt_ctf_field_array_get_field(self._f, index)
class SequenceField(Field):
+ """
+ Sequence (dynamic array) field, based on a
+ :class:`SequenceFieldDeclaration` object.
+ """
+
@property
def length(self):
"""
- Get the sequence's length field (IntegerField).
+ Sequence length (:class:`IntegerField`).
+
+ Set this attribute to change the sequence length's integer
+ field (integer must be unsigned).
+
+ :exc:`ValueError` or :exc:`TypeError` are raised on error.
"""
native_instance = nbt._bt_ctf_field_sequence_get_length(self._f)
@length.setter
def length(self, length_field):
- """
- Set the sequence's length field (IntegerField).
- """
-
if not isinstance(length_field, IntegerField):
raise TypeError("Invalid length field.")
def field(self, index):
"""
- Return the sequence's field at position "index".
+ Returns the :class:`Field` at index *index* in this sequence.
+
+ :exc:`ValueError` is raised on error.
"""
native_instance = nbt._bt_ctf_field_sequence_get_field(self._f, index)
class StringField(Field):
+ """
+ String (NULL-terminated array of bytes) field.
+ """
+
@property
def value(self):
"""
- Get a string field's value.
+ String value (:class:`str`).
+
+ Set this attribute to change the string's value.
+
+ :exc:`ValueError` or :exc:`TypeError` are raised on error.
"""
return nbt._bt_ctf_field_string_get_value(self._f)
@value.setter
def value(self, value):
- """
- Set a string field's value.
- """
-
ret = nbt._bt_ctf_field_string_set_value(self._f, str(value))
if ret < 0:
class EventClass:
+ """
+ An event class contains the properties of specific
+ events (:class:`Event`). Any concrete event must be linked with an
+ :class:`EventClass`.
+
+ Some attributes are automatically set when creating an event class.
+ For example, if no numeric ID is explicitly set using the
+ :attr:`id` attribute, a default, unique ID within the stream class
+ containing this event class will be created when needed.
+ """
+
def __init__(self, name):
"""
- Create a new event class of the given name.
+ Creates an event class named *name*.
+
+ :exc:`ValueError` is raised on error.
"""
self._ec = nbt._bt_ctf_event_class_create(name)
def add_field(self, field_type, field_name):
"""
- Add a field of type "field_type" to the event class.
+ Adds a field declaration *field_type* named *field_name* to
+ this event class.
+
+ *field_type* must be one of:
+
+ * :class:`IntegerFieldDeclaration`
+ * :class:`FloatingPointFieldDeclaration`
+ * :class:`EnumerationFieldDeclaration`
+ * :class:`StringFieldDeclaration`
+ * :class:`ArrayFieldDeclaration`
+ * :class:`SequenceFieldDeclaration`
+ * :class:`StructureFieldDeclaration`
+ * :class:`VariantFieldDeclaration`
+
+ :exc:`ValueError` is raised on error.
"""
ret = nbt._bt_ctf_event_class_add_field(self._ec, field_type._ft,
@property
def name(self):
"""
- Get the event class' name.
+ Event class' name.
"""
name = nbt._bt_ctf_event_class_get_name(self._ec)
@property
def id(self):
"""
- Get the event class' id. Returns a negative value if unset.
+ Event class' numeric ID.
+
+ Set this attribute to assign a numeric ID to this event class.
+ This ID must be unique amongst all the event class IDs of a
+ given stream class.
+
+ :exc:`TypeError` is raised on error.
"""
id = nbt._bt_ctf_event_class_get_id(self._ec)
@id.setter
def id(self, id):
- """
- Set the event class' id. Throws a TypeError if the event class
- is already registered to a stream class.
- """
-
ret = nbt._bt_ctf_event_class_set_id(self._ec, id)
if ret < 0:
- raise TypeError("Can't change an Event Class's id after it has been assigned to a stream class")
+ raise TypeError("Can't change an Event Class id after it has been assigned to a stream class")
@property
def stream_class(self):
"""
- Get the event class' stream class. Returns None if unset.
+ :class:`StreamClass` object containing this event class,
+ or ``None`` if not set.
"""
+
stream_class_native = nbt._bt_ctf_event_class_get_stream_class(self._ec)
if stream_class_native is None:
@property
def fields(self):
"""
- Generator returning the event class' fields as tuples of (field name, field declaration).
+ Generates the (field name, :class:`FieldDeclaration`) pairs of
+ this event class.
+
+ :exc:`TypeError` is raised on error.
"""
count = nbt._bt_ctf_event_class_get_field_count(self._ec)
def get_field_by_name(self, name):
"""
- Get a field declaration by name (FieldDeclaration).
+ Returns the :class:`FieldDeclaration` object named *name* in
+ this event class.
+
+ :exc:`TypeError` is raised on error.
"""
field_type_native = nbt._bt_ctf_event_class_get_field_by_name(self._ec, name)
projects / babeltrace.git / blobdiff