qmap.h 14.2 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
/****************************************************************************
** 
**
** Definition of QMap class
**
** Created : 990406
**
** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
**
** This file is part of the tools module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#ifndef QMAP_H
#define QMAP_H

#ifndef QT_H
#include "qshared.h"
#include "qdatastream.h"
#endif // QT_H


struct QMapNodeBase
{
    enum Color { Red, Black };

    QMapNodeBase* left;
    QMapNodeBase* right;
    QMapNodeBase* parent;

    Color color;

    QMapNodeBase* minimum() {
	QMapNodeBase* x = this;
	while ( x->left )
	    x = x->left;
	return x;
    }

    QMapNodeBase* maximum() {
	QMapNodeBase* x = this;
	while ( x->right )
	    x = x->right;
	return x;
    }
};


template <class K, class T>
struct QMapNode : public QMapNodeBase
{
    QMapNode( const K& _key, const T& _data ) { data = _data; key = _key; }
    QMapNode( const K& _key )	   { key = _key; }
    QMapNode( const QMapNode<K,T>& _n ) { key = _n.key; data = _n.data; }
    QMapNode() { }
    T data;
    K key;
};


template<class K, class T>
class Q_EXPORT QMapIterator
{
 public:
    /**
     * Typedefs
     */
    typedef QMapNode< K, T >* NodePtr;

    /**
     * Variables
     */
    QMapNode<K,T>* node;

    /**
     * Functions
     */
    QMapIterator() : node( 0 ) {}
    QMapIterator( QMapNode<K,T>* p ) : node( p ) {}
    QMapIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

    bool operator==( const QMapIterator<K,T>& it ) const { return node == it.node; }
    bool operator!=( const QMapIterator<K,T>& it ) const { return node != it.node; }
    T& operator*() { return node->data; }
    const T& operator*() const { return node->data; }

    // Cannot have this - some compilers are too stupid
    //T* operator->() const { return &(node->data); }

    const K& key() const { return node->key; }
    T& data() { return node->data; }
    const T& data() const { return node->data; }

private:
    int inc() {
	QMapNodeBase* tmp = node;
	if ( tmp->right ) {
	    tmp = tmp->right;
	    while ( tmp->left )
		tmp = tmp->left;
	} else {
	    QMapNodeBase* y = tmp->parent;
	    while (tmp == y->right) {
		tmp = y;
		y = y->parent;
	    }
	    if (tmp->right != y)
		tmp = y;
	}
	node = (NodePtr)tmp;
	return 0;
    }

    int dec() {
	QMapNodeBase* tmp = node;
	if (tmp->color == QMapNodeBase::Red &&
	    tmp->parent->parent == tmp ) {
	    tmp = tmp->right;
	} else if (tmp->left != 0) {
	    QMapNodeBase* y = tmp->left;
	    while ( y->right )
		y = y->right;
	    tmp = y;
	} else {
	    QMapNodeBase* y = tmp->parent;
	    while (tmp == y->left) {
		tmp = y;
		y = y->parent;
	    }
	    tmp = y;
	}
	node = (NodePtr)tmp;
	return 0;
    }

public:
    QMapIterator<K,T>& operator++() {
	inc();
	return *this;
    }

    QMapIterator<K,T> operator++(int) {
	QMapIterator<K,T> tmp = *this;
	inc();
	return tmp;
    }

    QMapIterator<K,T>& operator--() {
	dec();
	return *this;
    }

    QMapIterator<K,T> operator--(int) {
	QMapIterator<K,T> tmp = *this;
	dec();
	return tmp;
    }
};

template<class K, class T>
class Q_EXPORT QMapConstIterator
{
 public:
    /**
     * Typedefs
     */
    typedef QMapNode< K, T >* NodePtr;

    /**
     * Variables
     */
    QMapNode<K,T>* node;

    /**
     * Functions
     */
    QMapConstIterator() : node( 0 ) {}
    QMapConstIterator( QMapNode<K,T>* p ) : node( p ) {}
    QMapConstIterator( const QMapConstIterator<K,T>& it ) : node( it.node ) {}
    QMapConstIterator( const QMapIterator<K,T>& it ) : node( it.node ) {}

    bool operator==( const QMapConstIterator<K,T>& it ) const { return node == it.node; }
    bool operator!=( const QMapConstIterator<K,T>& it ) const { return node != it.node; }
    const T& operator*()  const { return node->data; }

    // Cannot have this - some compilers are too stupid
    //const T* operator->() const { return &(node->data); }

    const K& key() const { return node->key; }
    const T& data() const { return node->data; }

private:
    int inc() {
        QMapNodeBase* tmp = node;
	if ( tmp->right ) {
	    tmp = tmp->right;
	    while ( tmp->left )
		tmp = tmp->left;
	} else {
	    QMapNodeBase* y = tmp->parent;
	    while (tmp == y->right) {
		tmp = y;
		y = y->parent;
	    }
	    if (tmp->right != y)
		tmp = y;
	}
	node = (NodePtr)tmp;
	return 0;
    }

    int dec() {
	QMapNodeBase* tmp = node;
	if (tmp->color == QMapNodeBase::Red &&
	    tmp->parent->parent == tmp ) {
	    tmp = tmp->right;
	} else if (tmp->left != 0) {
	    QMapNodeBase* y = tmp->left;
	    while ( y->right )
		y = y->right;
	    tmp = y;
	} else {
	    QMapNodeBase* y = tmp->parent;
	    while (tmp == y->left) {
		tmp = y;
		y = y->parent;
	    }
	    tmp = y;
	}
	node = (NodePtr)tmp;
	return 0;
    }

public:
    QMapConstIterator<K,T>& operator++() {
	inc();
	return *this;
    }

    QMapConstIterator<K,T> operator++(int) {
	QMapConstIterator<K,T> tmp = *this;
	inc();
	return tmp;
    }

    QMapConstIterator<K,T>& operator--() {
	dec();
	return *this;
    }

    QMapConstIterator<K,T> operator--(int) {
	QMapConstIterator<K,T> tmp = *this;
	dec();
	return tmp;
    }
};


class Q_EXPORT QMapPrivateBase : public QShared
{
public:
    QMapPrivateBase() {
	node_count = 0;
    }
    QMapPrivateBase( const QMapPrivateBase* _map) {
	node_count = _map->node_count;
    }

    /**
     * Implementations of basic tree algorithms
     */
    void rotateLeft( QMapNodeBase* x, QMapNodeBase*& root);
    void rotateRight( QMapNodeBase* x, QMapNodeBase*& root );
    void rebalance( QMapNodeBase* x, QMapNodeBase*& root );
    QMapNodeBase* removeAndRebalance( QMapNodeBase* z, QMapNodeBase*& root,
				      QMapNodeBase*& leftmost,
				      QMapNodeBase*& rightmost );

    /**
     * Variables
     */
    int node_count;
};


template <class Key, class T>
class QMapPrivate : public QMapPrivateBase
{
public:
    /**
     * Typedefs
     */
    typedef QMapIterator< Key, T > Iterator;
    typedef QMapConstIterator< Key, T > ConstIterator;
    typedef QMapNode< Key, T > Node;
    typedef QMapNode< Key, T >* NodePtr;

    /**
     * Functions
     */
    QMapPrivate() {
	header = new Node;
	header->color = QMapNodeBase::Red; // Mark the header
	header->parent = 0;
	header->left = header->right = header;
    }
    QMapPrivate( const QMapPrivate< Key, T >* _map ) : QMapPrivateBase( _map ) {
	header = new Node;
	header->color = QMapNodeBase::Red; // Mark the header
	if ( _map->header->parent == 0 ) {
	    header->parent = 0;
	    header->left = header->right = header;
	} else {
	    header->parent = copy( (NodePtr)(_map->header->parent) );
	    header->parent->parent = header;
	    header->left = header->parent->minimum();
	    header->right = header->parent->maximum();
	}
    }
    ~QMapPrivate() { clear(); delete header; }

    NodePtr copy( NodePtr p ) {
	if ( !p )
	    return 0;
	NodePtr n = new Node( *p );
	n->color = p->color;
	if ( p->left ) {
	    n->left = copy( (NodePtr)(p->left) );
	    n->left->parent = n;
	} else {
	    n->left = 0;
	}
	if ( p->right ) {
	    n->right = copy( (NodePtr)(p->right) );
	    n->right->parent = n;
	} else {
	    n->right = 0;
	}
	return n;
    }

    void clear() {
	clear( (NodePtr)(header->parent) );
	header->color = QMapNodeBase::Red;
	header->parent = 0;
	header->left = header->right = header;
	node_count = 0;
    }

    void clear( NodePtr p ) {
	while ( p != 0 ) {
	    clear( (NodePtr)p->right );
	    NodePtr y = (NodePtr)p->left;
	    delete p;
	    p = y;
	}
    }

    Iterator begin()	{ return Iterator( (NodePtr)(header->left ) ); }
    Iterator end()	{ return Iterator( header ); }
    ConstIterator begin() const { return ConstIterator( (NodePtr)(header->left ) ); }
    ConstIterator end() const { return ConstIterator( header ); }

    ConstIterator find(const Key& k) const {
	QMapNodeBase* y = header;        // Last node
	QMapNodeBase* x = header->parent; // Root node.

	while ( x != 0 ) {
	    // If as k <= key(x) go left
	    if ( !( key(x) < k ) ) {
		y = x;
		x = x->left;
	    } else {
		x = x->right;
	    }
	}

	// Was k bigger/smaller then the biggest/smallest
	// element of the tree ? Return end()
	if ( y == header || k < key(y) )
	    return ConstIterator( header );
	return ConstIterator( (NodePtr)y );
    }

    void remove( Iterator it ) {
	NodePtr del = (NodePtr) removeAndRebalance( it.node, header->parent, header->left, header->right );
	delete del;
	--node_count;
    }

#ifdef QT_QMAP_DEBUG
    void inorder( QMapNodeBase* x = 0, int level = 0 ){
	if ( !x )
	    x = header->parent;
	if ( x->left )
	    inorder( x->left, level + 1 );
    //cout << level << " Key=" << key(x) << " Value=" << ((NodePtr)x)->data << endl;
	if ( x->right )
	    inorder( x->right, level + 1 );
    }
#endif

    Iterator insertMulti(const Key& v){
	QMapNodeBase* y = header;
	QMapNodeBase* x = header->parent;
	while (x != 0){
	    y = x;
	    x = ( v < key(x) ) ? x->left : x->right;
	}
	return insert(x, y, v);
    }

    Iterator insertSingle( const Key& k ) {
	// Search correct position in the tree
	QMapNodeBase* y = header;
	QMapNodeBase* x = header->parent;
	bool result = TRUE;
	while ( x != 0 ) {
	    result = ( k < key(x) );
	    y = x;
	    x = result ? x->left : x->right;
	}
	// Get iterator on the last not empty one
	Iterator j( (NodePtr)y );
	if ( result ) {
	    // Smaller then the leftmost one ?
	    if ( j == begin() ) {
		return insert(x, y, k );
	    } else {
		// Perhaps daddy is the right one ?
		--j;
	    }
	}
	// Really bigger ?
	if ( (j.node->key) < k )
	    return insert(x, y, k );
	// We are going to replace a node
	return j;
    }

    Iterator insert( QMapNodeBase* x, QMapNodeBase* y, const Key& k ) {
	NodePtr z = new Node( k );
	if (y == header || x != 0 || k < key(y) ) {
	    y->left = z;                // also makes leftmost = z when y == header
	    if ( y == header ) {
		header->parent = z;
		header->right = z;
	    } else if ( y == header->left )
		header->left = z;           // maintain leftmost pointing to min node
	} else {
	    y->right = z;
	    if ( y == header->right )
		header->right = z;          // maintain rightmost pointing to max node
	}
	z->parent = y;
	z->left = 0;
	z->right = 0;
	rebalance( z, header->parent );
	++node_count;
	return Iterator(z);
    }

protected:
    /**
     * Helpers
     */
    const Key& key( QMapNodeBase* b ) const { return ((NodePtr)b)->key; }

    /**
     * Variables
     */
    NodePtr header;
};


template<class Key, class T>
class Q_EXPORT QMap
{
public:
    /**
     * Typedefs
     */
    typedef QMapIterator< Key, T > Iterator;
    typedef QMapConstIterator< Key, T > ConstIterator;
    typedef T ValueType;
    typedef QMapPrivate< Key, T > Priv;

    /**
     * API
     */
    QMap() { sh = new QMapPrivate< Key, T >; }
    QMap( const QMap<Key,T>& m ) { sh = m.sh; sh->ref(); }
    ~QMap() { if ( sh->deref() ) delete sh; }

    QMap<Key,T>& operator= ( const QMap<Key,T>& m )
      { m.sh->ref(); if ( sh->deref() ) delete sh; sh = m.sh; return *this; }

    Iterator begin() { detach(); return sh->begin(); }
    Iterator end() { detach(); return sh->end(); }
    ConstIterator begin() const { return ((const Priv*)sh)->begin(); }
    ConstIterator end() const { return ((const Priv*)sh)->end(); }

    Iterator find ( const Key& k )
	{ detach(); return Iterator( sh->find( k ).node ); }
    ConstIterator find ( const Key& k ) const
	{ return sh->find( k ); }
    T& operator[] ( const Key& k ) {
	detach(); QMapNode<Key,T>* p = sh->find( k ).node;
	if ( p != sh->end().node ) return p->data;
	return insert( k, T() ).data(); }
    const T& operator[] ( const Key& k ) const
	{ return sh->find( k ).data(); }
    bool contains ( const Key& k ) const
	{ return find( k ) != end(); }
	//{ return sh->find( k ) != ((const Priv*)sh)->end(); }

    uint count() const { return sh->node_count; }

    bool isEmpty() const { return sh->node_count == 0; }

    Iterator insert( const Key& key, const T& value ) {
        detach();
        Iterator it = sh->insertSingle( key );
        it.data() = value;
        return it;
    }

    void remove( Iterator it ) { detach(); sh->remove( it ); }
    void remove( const Key& k ) {
        detach();
        Iterator it( sh->find( k ).node );
        if ( it != end() )
            sh->remove( it );
    }

    Iterator replace( const Key& k, const T& v ) {
	remove( k );
	return insert( k, v );
    }

    void clear() { if ( sh->count == 1 ) sh->clear(); else { sh->deref(); sh = new QMapPrivate<Key,T>; } }

#if defined(Q_FULL_TEMPLATE_INSTANTIATION)
    bool operator==( const QMap<Key,T>& ) const { return FALSE; }
#endif

protected:
    /**
     * Helpers
     */
    void detach() { if ( sh->count > 1 ) { sh->deref(); sh = new QMapPrivate<Key,T>( sh ); } }

    Priv* sh;
};


#ifndef QT_NO_DATASTREAM
template<class Key, class T>
inline QDataStream& operator>>( QDataStream& s, QMap<Key,T>& m ) {
    m.clear();
    Q_UINT32 c;
    s >> c;
    for( Q_UINT32 i = 0; i < c; ++i ) {
	Key k; T t;
	s >> k >> t;
	m.insert( k, t );
    }
    return s;
}


template<class Key, class T>
inline QDataStream& operator<<( QDataStream& s, const QMap<Key,T>& m ) {
    s << (Q_UINT32)m.count();
    QMapConstIterator<Key,T> it = m.begin();
    for( ; it != m.end(); ++it )
	s << it.key() << it.data();
    return s;
}
#endif

#endif // QMAP_H