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# Copyright (c) OpenMMLab. All rights reserved.
import json
import numpy as np
from .base import BaseFileHandler
def set_default(obj):
"""Set default json values for non-serializable values.
It helps convert ``set``, ``range`` and ``np.ndarray`` data types to list.
It also converts ``np.generic`` (including ``np.int32``, ``np.float32``,
etc.) into plain numbers of plain python built-in types.
"""
if isinstance(obj, (set, range)):
return list(obj)
elif isinstance(obj, np.ndarray):
return obj.tolist()
elif isinstance(obj, np.generic):
return obj.item()
raise TypeError(f'{type(obj)} is unsupported for json dump')
class JsonHandler(BaseFileHandler):
def load_from_fileobj(self, file):
return json.load(file)
def dump_to_fileobj(self, obj, file, **kwargs):
kwargs.setdefault('default', set_default)
json.dump(obj, file, **kwargs)
def dump_to_str(self, obj, **kwargs):
kwargs.setdefault('default', set_default)
return json.dumps(obj, **kwargs)
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