def has_object(self, object_type, object_value):
"""Determine if this PID is assigned to a specific object."""
if object_type not in cfg['PIDSTORE_OBJECT_TYPES']:
raise Exception("Invalid object type %s." % object_type)
object_value = to_unicode(object_value)
return self.object_type == object_type and \
self.object_value == object_value
def get(cls, pid_type, pid_value, pid_provider='', provider=None):
"""Get persistent identifier.
Return None if not found.
"""
pid_value = to_unicode(pid_value)
obj = cls.query.filter_by(
pid_type=pid_type, pid_value=pid_value, pid_provider=pid_provider
).first()
if obj:
obj._provider = provider
return obj
else:
return None
def assign(self, object_type, object_value, overwrite=False):
"""
Assign this persistent identifier to a given object
Note, the persistent identifier must first have been reserved. Also,
if an exsiting object is already assigned to the pid, it will raise an
exception unless overwrite=True.
"""
if object_type not in cfg['PIDSTORE_OBJECT_TYPES']:
raise Exception("Invalid object type %s." % object_type)
object_value = to_unicode(object_value)
if not self.id:
raise Exception(
"You must first create the persistent identifier before you "
"can assign objects to it."
)
if self.is_deleted():
raise Exception(
"You cannot assign objects to a deleted persistent identifier."
)
# Check for an existing object assigned to this pid
existing_obj_id = self.get_assigned_object(object_type)
if existing_obj_id and existing_obj_id != object_value:
if not overwrite:
raise Exception(
"Persistent identifier is already assigned to another "
"object"
)
else:
self.log(
"ASSIGN",
"Unassigned object %s:%s (overwrite requested)" % (
self.object_type, self.object_value)
)
self.object_type = None
self.object_value = None
elif existing_obj_id and existing_obj_id == object_value:
# The object is already assigned to this pid.
return True
self.object_type = object_type
self.object_value = object_value
db.session.commit()
self.log("ASSIGN", "Assigned object %s:%s" % (self.object_type,
self.object_value))
return True
def assign(self, object_type, object_value, overwrite=False):
"""Assign this persistent identifier to a given object.
Note, the persistent identifier must first have been reserved. Also,
if an exsiting object is already assigned to the pid, it will raise an
exception unless overwrite=True.
"""
if object_type not in cfg['PIDSTORE_OBJECT_TYPES']:
raise Exception("Invalid object type %s." % object_type)
object_value = to_unicode(object_value)
if not self.id:
raise Exception(
"You must first create the persistent identifier before you "
"can assign objects to it."
)
if self.is_deleted():
raise Exception(
"You cannot assign objects to a deleted persistent identifier."
)
# Check for an existing object assigned to this pid
existing_obj_id = self.get_assigned_object(object_type)
if existing_obj_id and existing_obj_id != object_value:
if not overwrite:
raise Exception(
"Persistent identifier is already assigned to another "
"object"
)
else:
self.log(
"ASSIGN",
"Unassigned object %s:%s (overwrite requested)" % (
self.object_type, self.object_value)
)
self.object_type = None
self.object_value = None
elif existing_obj_id and existing_obj_id == object_value:
# The object is already assigned to this pid.
return True
self.object_type = object_type
self.object_value = object_value
db.session.commit()
self.log("ASSIGN", "Assigned object %s:%s" % (self.object_type,
self.object_value))
return True
