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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\class QAbstractXmlForwardIterator
\brief The QAbstractXmlForwardIterator class is a base class for forward iterators.
\reentrant
\since 4.4
\ingroup xml-tools
\internal
This abstract base class is for creating iterators for
traversing custom data structures modeled to look like XML.
An item can be instantiated in QAbstractXmlForwardIterator if:
\list
\o It has a default constructor, a copy constructor, and an
assignment operator, and
\o It has an appropriate qIsForwardIteratorEnd() function.
\endlist
@ingroup Patternist_iterators
@author Frans Englich <fenglich@trolltech.com>
*/
/*!
\typedef QAbstractXmlForwardIterator::Ptr
A smart pointer wrapping an instance of a QAbstractXmlForwardIterator subclass.
*/
/*!
\typedef QAbstractXmlForwardIterator::List
A QList containing QAbstractXmlForwardIterator::Ptr instances.
*/
/*!
\typedef QAbstractXmlForwardIterator::Vector
A QVector containing QAbstractXmlForwardIterator::Ptr instances.
*/
/*!
\fn QAbstractXmlForwardIterator::QAbstractXmlForwardIterator()
Default constructor.
*/
/*!
\fn QAbstractXmlForwardIterator::~QAbstractXmlForwardIterator()
Destructor.
*/
/*!
\fn T QAbstractXmlForwardIterator::next() = 0;
Returns the next item in the sequence, or
a null object if the end has been reached.
*/
/*!
\fn T QAbstractXmlForwardIterator::current() const = 0;
Returns the current item in the sequence. If this function is called
before the first call to next(), a null object is returned. If the
end of the sequence has been reached, a null object is returned.
*/
/*!
\fn qint64 QAbstractXmlForwardIterator::position() const = 0;
Returns the current position in the sequence represented
by \e this.
The first position is 1, not 0. If next() hasn't been called, 0 is
returned. If \e this has reached the end, -1 is returned.
*/
/*!
\fn bool qIsForwardIteratorEnd(const T &unit)
\since 4.4
\relates QAbstractXmlForwardIterator
The Callback QAbstractXmlForwardIterator uses for determining
whether \a unit is the end of a sequence.
If \a unit is a value that would signal the end of a sequence
(typically a default constructed value), this function returns \c
true, otherwise \c false.
This implementation works for any type that has a boolean operator.
For example, this function should work satisfactory for pointers.
*/
/*!
\fn qint64 QAbstractXmlForwardIterator::count()
\internal
Determines the number of items this QAbstractXmlForwardIterator
represents.
Note that this function is not \c const. It modifies the
QAbstractXmlForwardIterator. The reason for this is efficiency. If
this QAbstractXmlForwardIterator must not be changed, get a copy()
before performing the count.
The default implementation simply calls next() until the end is
reached. Hence, it may be of interest to override this function if
the sub-class knows a better way of computing its count.
The number of items in the sequence is returned.
*/
/*!
\fn QAbstractXmlForwardIterator<T>::Ptr QAbstractXmlForwardIterator::toReversed();
\internal
Returns a reverse iterator for the sequence.
This function may modify the iterator, it can be considered a
function that evaluates this QAbstractXmlForwardIterator. It is not
a \e getter, but potentially alters the iterator in the same way the
next() function does. If this QAbstractXmlForwardIterator must not
be modified, such that it can be used for evaluation with next(),
use a copy().
*/
/*!
\fn QList<T> QAbstractXmlForwardIterator<T>::toList();
\internal
Performs a copy of this QAbstractXmlForwardIterator(with copy()),
and returns its items in a QList. Thus, this function acts as a
conversion function, converting the sequence to a QList.
This function may modify the iterator. It is not a \e getter, but
potentially alters the iterator in the same way the next() function
does. If this QAbstractXmlForwardIterator must not be modified,
such that it can be used for evaluation with next(), use a copy().
*/
/*!
\fn T QAbstractXmlForwardIterator::last();
\internal
Returns the item at the end of this QAbstractXmlForwardIterator.
The default implementation calls next() until the end is reached.
*/
/*!
\fn T QAbstractXmlForwardIterator::isEmpty();
\internal
Returns true if the sequence is empty.
*/
/*!
\fn qint64 QAbstractXmlForwardIterator::sizeHint() const;
\internal
Gives a hint to the size of the contained sequence. The hint is
assumed to be as close as possible to the actual size.
If no sensible estimate can be computed, -1 should be returned.
*/
/*!
\fn typename QAbstractXmlForwardIterator<T>::Ptr QAbstractXmlForwardIterator::copy() const;
\internal
Copies this QAbstractXmlForwardIterator and returns the copy.
A copy and the original instance are completely independent of each
other. Because evaluating an QAbstractXmlForwardIterator modifies
it, one should always use a copy when an
QAbstractXmlForwardIterator needs to be used several times.
*/
/*!
\class QPatternist::ListIteratorPlatform
\brief Helper class for ListIterator, and should only be instantiated through sub-classing.
\reentrant
\since 4.4
\internal
\ingroup xml-tools
ListIteratorPlatform iterates an InputList with instances
of InputType. For every item in it, it returns an item from it,
that is converted to OutputType by calling a function on Derived
that has the following signature:
\snippet doc/src/snippets/code/src_xmlpatterns_api_qabstractxmlforwarditerator.cpp 0
TODO Document why this class doesn't duplicate ItemMappingIterator.
*/
/*!
\fn QPatternist::ListIteratorPlatform::ListIteratorPlatform(const ListType &list);
Constructs a ListIteratorPlatform that walks the given \a list.
*/
/*!
\class QPatternist::ListIterator
\brief Bridges values in Qt's QList container class into an QAbstractXmlForwardIterator.
\reentrant
\since 4.4
\internal
\ingroup xml-tools
ListIterator takes a reference to a QList<T> instance and allows
access to that list via its QAbstractXmlForwardIterator interface.
ListIterator is parameterized with the type to iterate over, e.g.,
Item or Expression::Ptr.
ListIterator is used by the ExpressionSequence to create an
iterator over its operands. The iterator will be passed to a
MappingIterator.
*/
/*!
\fn QPatternist::makeListIterator(const QList<T> &qList)
\relates QPatternist::ListIterator
An object generator for ListIterator.
makeListIterator() is a convenience function to avoid specifying
the full template instantiation for ListIterator. Conceptually, it
is identical to Qt's qMakePair().
*/
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