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ReadContextFromFile: read a context from a given file
@file_path: the path to the file
This function reads a context from a gzip'ed file
returns: the context from the file
exceptions: FileIO
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WriteContextFromFile: write a context to a given file
@file_path: the path to the file
@context: the context to write
This function writes a context to a gzip'ed file
returns: none
exceptions: FileIO
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getBox: get a BlackBox from this module
@box_cfg: a box_cfg conformant AdmList element containing
the following elements:
path: type string, the path to the context file (required)
readable: type bool, flag, if the box should be readable (optional)
writable: type bool, flag, if the box should be writable (optional)
returns: FileBlackBox object
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The FileBlackBox class provides a class to read and write Contexts
from and to files.
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__init__: Initialize a BlackBox
@self: the class instance
@box_cfg: a box_cfg conformant AdmList element containing
the following elements:
path: type string, the path to the context file (required)
readable: type bool, flag, if the box should
be readable (optional)
writable: type bool, flag, if the box should
be writable (optional)
mode: an integer file mode
This function is the initializer for FileBlackBoxes.
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isReadable: if a read were attempted now, would it succede?
@self: this BlackBox instance
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isWritable: if a write were attempted now, would it succede?
@self: this BlackBox instance
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read: read the contents of the FileBlackBox
@self: this FileBlackBox instance
This function is callable multiple times, and if it cannot
succede on a given call, it returns None. It does not
cache returns information in the normal sense, unless the data
is not dynamic. And it does not keep a reference to the
AdmContext it returns.
It also sets the serial of the returned context to the modify
time of the file.
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version: returns the version of this FileBlackBox's context
@self: this FileBlackBox instance
This function returns the modification time (in seconds since the epoch)
of the file referenced by self.path
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write: write the contents of the FileBlackBox
@self: this FileBlackBox instance
This function is callable multiple times. It writes a
Context out to the file the FileBlackBox is initialized with.
It returns 0 on failure, and a non-zero, positive integer
on success.
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