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/****************************************************************************
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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** This file is part of the documentation of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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****************************************************************************/
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Provides a handler for processing XML elements found by the reader.
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The handler looks for <title> and <link> elements within <item> elements,
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and records the text found within them. Link information stored within
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rdf:about attributes of <item> elements is also recorded when it is
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For each item found, a signal is emitted which specifies its title and
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link information. This may be used by user interfaces for the purpose of
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displaying items as they are read.
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Reset the state of the handler to ensure that new documents are
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We return true to indicate that parsing should continue.
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bool Handler::startDocument()
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Process each starting element in the XML document.
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Nested item, title, or link elements are not allowed, so we return false
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if we encounter any of these. We also prohibit multiple definitions of
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Link destinations are read by this function if they are specified as
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attributes in item elements.
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For all cases not explicitly checked for, we return true to indicate that
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the element is acceptable, and that parsing should continue. By doing
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this, we can ignore elements in which we are not interested.
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bool Handler::startElement(const QString &, const QString &,
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const QString & qName, const QXmlAttributes &attr)
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if (qName == "item") {
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linkString = attr.value("rdf:about");
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else if (qName == "title") {
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else if (!titleString.isEmpty())
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else if (qName == "link") {
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Process each ending element in the XML document.
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For recognized elements, we reset flags to ensure that we can read new
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instances of these elements. If we have read an item element, emit a
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signal to indicate that a new item is available for display.
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We return true to indicate that parsing should continue.
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bool Handler::endElement(const QString &, const QString &,
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const QString & qName)
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if (qName == "title" && inTitle)
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else if (qName == "link" && inLink)
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else if (qName == "item") {
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if (!titleString.isEmpty() && !linkString.isEmpty())
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emit newItem(titleString, linkString);
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Collect characters when reading the contents of title or link elements
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when they occur within an item element.
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We return true to indicate that parsing should continue.
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bool Handler::characters (const QString &chars)
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titleString += chars;
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Report a fatal parsing error, and return false to indicate to the reader
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that parsing should stop.
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bool Handler::fatalError (const QXmlParseException & exception)
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qWarning() << "Fatal error on line" << exception.lineNumber()
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<< ", column" << exception.columnNumber() << ":"
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<< exception.message();