/*

File: TreeNode.h

Abstract: Interface code for TreeNode.h

Version: <1.0>

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*/ 

#import <Foundation/Foundation.h>

@interface TreeNodeData : NSObject {

}

- (NSComparisonResult)compare:(TreeNodeData*)other;

@end

@interface TreeNode : NSObject {

@protected

    TreeNode *nodeParent;

    TreeNodeData *nodeData;

    NSMutableArray *nodeChildren;

}

+ (id)treeNodeWithData:(TreeNodeData*)data;

- (id)initWithData:(TreeNodeData*)data parent:(TreeNode*)parent children:(NSArray*)children;

- (void)setNodeData:(TreeNodeData*)data;

- (TreeNodeData*)nodeData;

- (void)setNodeParent:(TreeNode*)parent;

- (TreeNode*)nodeParent;

- (void)insertChild:(TreeNode*)child atIndex:(int)index;

- (void)insertChildren:(NSArray*)children atIndex:(int)index;

- (void)removeChild:(TreeNode*)child;

- (void)removeFromParent;

- (int)indexOfChild:(TreeNode*)child;

- (int)indexOfChildIdenticalTo:(TreeNode*)child;

- (int)numberOfChildren;

- (NSArray*)children;

- (TreeNode*)firstChild;

- (TreeNode*)lastChild;

- (TreeNode*)childAtIndex:(int)index;

- (BOOL)isDescendantOfNode:(TreeNode*)node;

    // returns YES if 'node' is an ancestor.

- (BOOL)isDescendantOfNodeInArray:(NSArray*)nodes;

    // returns YES if any 'node' in the array 'nodes' is an ancestor of ours.

- (void)recursiveSortChildren;

    // sort children using the compare: method in TreeNodeData

// Returns the minimum nodes from 'allNodes' required to cover the nodes in 'allNodes'.

// This methods returns an array containing nodes from 'allNodes' such that no node in

// the returned array has an ancestor in the returned array.

+ (NSArray *)minimumNodeCoverFromNodesInArray: (NSArray *)allNodes;

@end