class c4_Storage

Manager for persistent storage of view structures.

Public:

c4_Storage (c4_File* file_ =0);

Constructs streaming-only or descriptor-based storage object.

c4_Storage (c4_Strategy& strategy_);

Constructs a storage using the specified strategy handler.

c4_Storage (const char* filename_, const char* description_);

Constructs a storage object for given file and format.

c4_Storage (const char* filename_, bool canModify_);

Constructs a storage object, keeping the current structure.

~c4_Storage ();

void AutoCommit ();

Sets storage up to always call Commit in the destructor.

c4_RowRef Contents () const;

Gives access to the stored data as a single row.

c4_Strategy& Strategy () const;

Returns the strategy object associated with this storage.

c4_Table& RootTable () const;

Returns the root table entry.

c4_String Description () const;

Returns a description of the data structure.

bool Commit ();

Flushes pending changes to file right now.

bool Rollback ();

(Re)initializes for on-demand loading. This will cancel all uncommitted changes.

c4_ViewRef View (const char* name_) const;

Used to get or set a named view in this storage object.

c4_View GetAs (const char* description_);

Get a named view, redefining it to match the given structure.

c4_View Store (const char* name_, const c4_View& view_);

Attaches a view using specified name in this storage object.

void LoadFromStream (void* _auxArg);

Loads contents from the specified input stream.

void SaveToStream (void* _auxArg);

Saves contents to the specified output stream.

#include "k4view.h"   // Jun 8, 1997