48 lines
1.5 KiB
Python
48 lines
1.5 KiB
Python
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"""
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This class is a wrapper around read/write classes of cloud,sql,nosql,other packages
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The wrapper allows for application of plugins as pre-post conditions
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"""
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class IO:
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"""
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Base wrapper class for read/write
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"""
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def __init__(self,_agent,loader):
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self._agent = _agent
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self._loader = loader
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def meta (self,**_args):
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if hasattr(self._agent,'meta') :
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return self._agent.meta(**_args)
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return []
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def close(self):
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if hasattr(self._agent,'close') :
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self._agent.close()
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def apply(self):
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"""
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applying pre/post conditions given a pipeline expression
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"""
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for _pointer in self._loader :
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_data = _pointer(_data)
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def apply(self,_query):
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if hasattr(self._agent,'apply') :
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return self._agent.apply(_query)
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return None
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class IReader(IO):
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def __init__(self,_agent,pipeline=None):
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super().__init__(_agent,pipeline)
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def read(self,**_args):
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_data = self._agent.read(**_args)
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if self._loader and self._loader.ratio() > 0 :
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_data = self._loader.apply(_data)
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#
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# output data
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return _data
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class IWriter(IO):
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def __init__(self,_agent,pipeline=None):
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super().__init__(_agent,pipeline)
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def write(self,_data,**_args):
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if self._loader and self._loader.ratio() > 0 :
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_data = self._loader.apply(_data)
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self._agent.write(_data,**_args)
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