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qdawg.h

This is the verbatim text of the qdawg.h include file. It is provided only for illustration; the copyright remains with Trolltech.

/**********************************************************************
** Copyright (C) 2000-2005 Trolltech AS.  All rights reserved.
**
** This file is part of the Qtopia Environment.
**
** Licensees holding a valid license agreement from Trolltech or any of its
** authorized distributors may use this file in accordance with
** the License Agreement provided with the Licensed 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 Trolltech's Commercial License Agreements.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#ifndef QDAWG_H
#define QDAWG_H

#include <qtopia/qpeglobal.h>
#include <qstringlist.h>

class QIODevice;
class QDawgPrivate;

class QTOPIA_EXPORT QDawg {
public:
    QDawg();
    ~QDawg();

    bool readFile(const QString&); // may mmap
    bool read(QIODevice* dev);
    bool write(QIODevice* dev) const;
    bool createFromWords(QIODevice* dev);
    void createFromWords(const QStringList&);
    QStringList allWords() const;

    bool contains(const QString&) const;
    int countWords() const;

    enum {nodebits = 18};

    class Node {
	friend class QDawgPrivate;
	uint let:16;
        uint a : 14 ; //not used
	uint isword:1;
	uint islast:1;
	int offset:nodebits;
        int b : 14 ; //not used
	Node() { a = b = 0; /*set zero for better compression*/ }
    public:
	QChar letter() const { return QChar((ushort)let); }
	bool isWord() const { return isword; }
	bool isLast() const { return islast; }
	const Node* next() const { return islast ? 0 : this+1; }
	const Node* jump() const { return offset ? this+offset : 0; }
    };

    const Node* root() const;

    void dump() const; // debug

private:
    friend class QDawgPrivate;
    QDawgPrivate* d;
};


#endif