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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:34:13 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:34:13 (GMT)
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Long live Qt!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qxmlresultitems.h"
+#include "qxmlresultitems_p.h"
+#include "qitem_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+ \class QXmlResultItems
+ \brief The QXmlResultItems class iterates through the results of evaluating an XQuery in QXmlQuery.
+ \reentrant
+ \since 4.4
+ \ingroup xml-tools
+
+ QXmlResultItems presents the evaluation of an associated query as a
+ sequence of \l{QXmlItem}{QXmlItems}. The sequence is traversed by
+ repeatedly calling next(), which actually produces the sequence by
+ lazy evaluation of the query.
+
+ \snippet doc/src/snippets/code/src_xmlpatterns_api_qxmlresultitems.cpp 0
+
+ An effect of letting next() produce the sequence by lazy evaluation
+ is that a query error can occur on any call to next(). If an error
+ occurs, both next() and current() will return the null QXmlItem, and
+ hasError() will return true.
+
+ QXmlResultItems can be thought of as an "iterator" that traverses
+ the sequence of query results once, in the forward direction. Each
+ call to next() advances the iterator to the next QXmlItem in the
+ sequence and returns it, and current() always returns the QXmlItem
+ that next() returned the last time it was called.
+
+ \sa QXmlItem::isNode(), QXmlItem::isAtomicValue(), QXmlNodeModelIndex
+ */
+
+/*!
+ Constructs an instance of QXmlResultItems.
+ */
+QXmlResultItems::QXmlResultItems() : d_ptr(new QXmlResultItemsPrivate())
+{
+}
+
+/*!
+ Destroys this instance of QXmlResultItems.
+ */
+QXmlResultItems::~QXmlResultItems()
+{
+ delete d_ptr;
+}
+
+/*!
+ Returns the next result in the sequence produced by lazy evaluation
+ of the associated query. When the returned QXmlItem is null, either
+ the evaluation terminated normally without producing another result,
+ or an error occurred. Call hasError() to determine whether the null
+ item was caused by normal termination or by an error.
+
+ Returns a null QXmlItem if there is no associated QXmlQuery.
+ */
+QXmlItem QXmlResultItems::next()
+{
+ Q_D(QXmlResultItems);
+ if(d->hasError)
+ return QXmlItem();
+
+ try
+ {
+ d->current = QPatternist::Item::toPublic(d->iterator->next());
+ return d->current;
+ }
+ catch(const QPatternist::Exception)
+ {
+ d->current = QXmlItem();
+ d->hasError = true;
+ return QXmlItem();
+ }
+}
+
+/*!
+ Returns the current item. The current item is the last item
+ that was produced and returned by next().
+
+ Returns a null QXmlItem if there is no associated QXmlQuery.
+ */
+QXmlItem QXmlResultItems::current() const
+{
+ Q_D(const QXmlResultItems);
+
+ if(d->hasError)
+ return QXmlItem();
+ else
+ return d->current;
+}
+
+/*!
+
+ If an error occurred during evaluation of the query, true is
+ returned.
+
+ Returns false if query evaluation has been done.
+ */
+bool QXmlResultItems::hasError() const
+{
+ Q_D(const QXmlResultItems);
+ return d->hasError;
+}
+
+QT_END_NAMESPACE
+