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This is only called on Python 2, because the cStringIO module only exists on Python 2. @param stringo: The string output to pickle. @type stringo: C{cStringIO.OutputType} )�unpickleStringO�getvalue�tell)Zstringor r r � pickleStringO� s r+ c C s t � }|�| � |�|� |S )a� Convert the output of L{pickleStringO} into an appropriate type for the current python version. This may be called on Python 3 and will convert a cStringIO into an L{io.StringIO}. @param val: The content of the file. @type val: L{bytes} @param sek: The seek position of the file. @type sek: L{int} @return: a file-like object which you can write bytes to. @rtype: C{cStringIO.OutputType} on Python 2, L{io.StringIO} on Python 3. )� _cStringIO�write�seek��valZsekr% r r r r( � s r( c C s t | �� | �� ffS )aQ Reduce the given cStringI. This is only called on Python 2, because the cStringIO module only exists on Python 2. @param stringi: The string input to pickle. @type stringi: C{cStringIO.InputType} @return: a 2-tuple of (C{unpickleStringI}, (bytes, pointer)) @rtype: 2-tuple of (function, (bytes, int)) )�unpickleStringIr) r* )Zstringir r r � pickleStringI� s r2 c C s t | �}|�|� |S )a� Convert the output of L{pickleStringI} into an appropriate type for the current Python version. This may be called on Python 3 and will convert a cStringIO into an L{io.StringIO}. @param val: The content of the file. @type val: L{bytes} @param sek: The seek position of the file. @type sek: L{int} @return: a file-like object which you can read bytes from. @rtype: C{cStringIO.OutputType} on Python 2, L{io.StringIO} on Python 3. )r, r. r/ r r r r1 � s r1 c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) � Ephemeralzh This type of object is never persisted; if possible, even references to it are eliminated. c C s t dfS )zu Serialize any subclass of L{Ephemeral} in a way which replaces it with L{Ephemeral} itself. r )r3 )�selfr r r � __reduce__� s zEphemeral.__reduce__c C sJ t �d| � tsFdd l}t|dd �rF|�| �D ]}t �d|� �� q0d S )Nz!WARNING: serializing ephemeral %sr � get_referrersz referred to by )r r r �gcr r6 )r4 r7 �rr r r � __getstate__� s zEphemeral.__getstate__c C s t �d| j � t| _d S )Nz#WARNING: unserializing ephemeral %s)r r r r3 �r4 �stater r r � __setstate__� s zEphemeral.__setstate__N)r r r �__doc__r5 r9 r< r r r r r3 � s r3 � Versioned�versionedsToUpgradec C s& t t�� �D ] } t| � q i ai ad S �N)�listr? �values�requireUpgrade�upgraded)Z versionedr r r � doUpgrade� s rE c C s0 t | �}|tv r,|tvr,dt|< | �� | S dS )z?Require that a Versioned instance be upgraded completely first.� N)�idr? rD �versionUpgrade)�objZobjIDr r r rC s rC c C s@ | t g}t�| �D ] }||vrt|t �r|�|� q|dd� S )z� Get all of the parent classes of C{c}, not including C{c} itself, which are strict subclasses of L{Versioned}. @param c: a class @returns: list of classes � N)r> �inspect�getmro� issubclass�append)�c�l�br r r �_aybabtu s rR c @ s2 e Zd ZdZdZdZdd� Zd dd�Zd d � ZdS ) r> a� This type of object is persisted with versioning information. 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