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284 lines
6.1 KiB
C++
284 lines
6.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/**
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* This file defines the binary tree class and it
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* nsNode child class. Note that like all nsBTree
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* containers, this one does not automatically balance.
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* (Find for random data, bad for pre-ordered data).
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*
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* This simple version stores nodes, and the
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* nodes store void* ptrs.
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*
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* @update gess 4/11/98
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*/
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/**
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* nsNode
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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#ifndef _BTREE_H
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#define _BTREE_H
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#include "nscore.h"
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struct NS_BASE nsNode {
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/**
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*
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* @update gess4/20/98
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* @param
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* @return
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*/
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nsNode();
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/**
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* Copy constructor
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* @update gess 4/11/98
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*/
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nsNode(const nsNode& aNode);
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/**
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* destructor
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* @update gess 4/11/98
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*/
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virtual ~nsNode();
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/**
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* Retrieve parent node
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*
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* @update gess 4/11/98
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* @return
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*/
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nsNode* GetParentNode(void) const;
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/**
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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nsNode* GetLeftNode() const;
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/**
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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nsNode* GetRightNode() const;
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/**
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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virtual nsNode& operator=(const nsNode& aNode);
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/**
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* This method gets called to determine which of
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* two nodes is less. When you create your own
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* subclass of nsNode, this is the most important
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* method for you to overload.
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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virtual PRBool operator<(const nsNode& aNode) const=0;
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/**
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* This method gets called to determine which of
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* two nodes is less. When you create your own
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* subclass of nsNode, this is the most important
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* method for you to overload.
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*
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* @update gess 4/11/98
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* @param
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* @return
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*/
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virtual PRBool operator==(const nsNode& aNode) const=0;
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enum eRBColor {eRed,eBlack};
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nsNode* mParent;
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nsNode* mLeft;
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nsNode* mRight;
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eRBColor mColor;
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};
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/**
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* The Nodefunctor class is used when you want to create
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* callbacks between the nsRBTree and your generic code.
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*
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* @update gess4/20/98
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*/
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class NS_BASE nsNodeFunctor {
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public:
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virtual nsNodeFunctor& operator()(nsNode& aNode)=0;
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};
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/****************************************************
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* Here comes the nsBTree class...
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****************************************************/
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class NS_BASE nsBTree {
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public:
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friend class nsBTreeIterator;
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nsBTree();
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virtual ~nsBTree();
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/**
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* Add given node reference into our tree.
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*
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* @update gess 4/11/98
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* @param aNode is a ref to a node to be added
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* @return newly added node
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*/
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nsNode* Add(nsNode& aNode);
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/**
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* Remove given node reference into our tree.
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*
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* @update gess 4/11/98
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* @param aNode is a ref to a node to be removed
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* @return Ptr to node if found (and removed) or NULL
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*/
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nsNode* Remove(nsNode& aNode);
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/**
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* Clears the tree of any data.
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* Be careful here if your objects are heap based!
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* This method doesn't free the objects, so if you
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* don't have your own pointers, they will become
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* orphaned.
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*
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* @update gess 4/11/98
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* @param
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* @return this
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*/
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nsBTree& Empty(nsNode* aNode=0);
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/**
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* This method destroys all the objects in the tree.
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* WARNING: Never call this method on stored objects
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* that are stack-based!
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*
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* @update gess 4/11/98
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* @param
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* @return this
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*/
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nsBTree& Erase(nsNode* aNode=0);
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/**
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* Retrieve ptr to 1st node in tree (starting at root)
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*
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* @update gess 4/11/98
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* @return ptr to 1st node, possible to be NULL
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*/
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nsNode* First(void) const;
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/**
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* Find first node in tree starting at given node
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*
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* @update gess 4/11/98
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* @param aNode node to begin 1st search from
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* @return ptr to 1st node below given node
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*/
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nsNode* First(const nsNode& aNode) const;
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/**
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* Retrieve ptr to last node in tree relative to root.
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*
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* @update gess 4/11/98
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* @return ptr to last node or NULL
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*/
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nsNode* Last(void) const;
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/**
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* Retrieve ptr to last node in tree relative to given node.
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*
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* @update gess 4/11/98
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* @param node to find last node from
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* @return ptr to last node or NULL
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*/
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nsNode* Last(const nsNode& aNode) const;
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/**
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* Retrieve a ptr to the node that preceeds given node
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*
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* @update gess 4/11/98
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* @param aNode used as reference to find prev.
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* @return ptr to prev node or NULL
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*/
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nsNode* Before(const nsNode& aNode) const;
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/**
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* Retrieve a ptr to the node after given node
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*
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* @update gess 4/11/98
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* @param aNode used as reference to find next.
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* @return ptr to next node or NULL
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*/
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nsNode* After(const nsNode& aNode) const;
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/**
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* Find given node in tree.
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* (Why would you want to find a node you already have?)
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*
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* @update gess 4/11/98
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* @param aNode is the node you're searching for
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* @return ptr to node if found, or NULL
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*/
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nsNode* Find(const nsNode& aNode) const;
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/**
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* Walks the tree, starting with root.
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*
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* @update gess 4/11/98
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*/
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virtual const nsBTree& ForEach(nsNodeFunctor& aFunctor,nsNode* aNode=0) const;
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protected:
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/**
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* Rebalances tree around the given node. This only
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* needs to be called after a node is deleted.
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*
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* @update gess 4/11/98
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* @param aNode -- node to balance around
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* @return this
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*/
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virtual nsBTree& ReBalance(nsNode& aNode);
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nsNode* mRoot;
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};
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#endif
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