/*

File: DataInfo.h

Abstract: Datasource class for NSOutlineView.

Version: 1.0

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*/ 

#import <Cocoa/Cocoa.h>

@class PSFeed;

/*

 * In the outline view used by both windows, the data sources has two layers.

 * root

 *   +-- Category 1

 *        +-- Leaf 1

 *        +-- Leaf 2

 *        ...

 *   +-- Category 2

 *        +-- Leaf 1

 *        ...

 *   ...

 *

 * Classes in this file defined represent different node types used by the tree.

 */

/*!

 * @abstract Base class for all other data source type.

 *

 * This class doesn't contain any concrete data.

 */

@interface DataInfo : NSObject {

}

- (unsigned)numberOfChildren;

- (BOOL)isLeaf;

- (NSString*)title;

- (NSURL*)url;

- (NSString*)urlString;

- (NSString*)score;

@end

/*!

 * @abstract Leaf data type used by the datasource for the outline view in

 *           Training window.

 */

@interface URLDataInfo : DataInfo {

    NSString* fTitle;

    NSURL* fURL;    

}

- (id)initWithURL:(NSURL*)aURL andTitle:(NSString*)aTitle;

@end

/*!

 * @abstract Leaf data type used by the datasource for the outline view in

 *           Evaluation window.

 *

 * This class contains an instance of PSFeed, defined by PubSub.framework.

 */

@interface FeedDataInfo : DataInfo {

    PSFeed* fFeed;

    NSNumber* fScore;

}

- (id)initWithFeed:(PSFeed*)feed;

- (PSFeed*)feed;

- (NSString*)plainText; //< The plain text representation (i.e. without html tags) of the feed.

- (void)setScore:(NSNumber*)score;

@end 

/*!

 * @abstract Non-leaf node type used by the datasources for both outline views.

 */

@interface CategoryDataInfo : DataInfo {

    NSString* fTitle;

    NSMutableArray* fChildren;

}

- (id)initWithTitle:(NSString*)aTitle;

- (void)addChild:(DataInfo*)child;

- (NSEnumerator*)childEnumerator;

- (DataInfo*)childAt:(unsigned)index;

- (void)removeAllChildren;

@end