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//
// IIOmodule is an abstract super class for IO modules for accessing a database.
// The items in a database is organized heirarchly into a directory tree. A
// directory is permitted to have both subdirectories and items. A IO module
// supports a standard interface to a browser. This permits the same browser
// to be used with different types of databases provided that the database can
// be organized into a directory tree. This standard interface is specified
// by having the IIOmodule support the following methods:
//
// (IOrderedListD *)subDirectoryOf:directoryNode
// This method should return a list of nodes that corresponds to the
// subdirectories of the directory that corresponds to the node
// directoryNode. The ownership of the list of nodes passes to the
// caller. A nil directoryNode indicates the root node.
//
// (IOrderedListD *)itemHeadersOf:directoryNode
// This method should return a list of nodes that corresponds to the
// items of the directory that corresponds to the node of directoryNode.
// The ownership of the list of nodes passes to the caller.
//
// (IOrderedListD *)itemOf:itemNode
// This method should return the item that corresponds to itemNode.
// This method should send a message to the the editor to display this
// item. The ownership of the item passes to the caller.
//
// A node is a private object that corresponds to a directory or an item.
// It should implement the following methods:
//
// (const char *)titleForCell;
// This method should return the name of the directory or item that
// corresponds to this node. This is used for the title of the
// corresponding browser cell.
//
// (BOOL)isLeaf;
// This method indicates for a node that corresponds to a directory
// whether it has subdirectories or not. TRUE if it has no
// subdirectories.
//
// A node should save in its private instance variables the links to its
// corresponding directory object or item object. This allows a uniform
// interface to the browser module using the above methods but a custom
// interface to the IO module using private instance variables and methods.
//
#import "IIOmodule.h"
#import <string.h>
@implementation IIOmodule
- setRootName:(char *)rootName
{
strncpy (iRootName, rootName, sizeof(iRootName)-1);
return self;
}
- (char *)rootName
{
return (iRootName);
}
- (BOOL)toggleActive:node
{
// this routine should be overriden
return YES;
}
- subDirectoryOf:node
{
// this routine should be overriden
return self;
}
- itemHeadersOf:node
{
// this routine should be overriden
return self;
}
- itemOf:node
{
// this routine should be overriden
return self;
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.