summaryrefslogtreecommitdiffstats
path: root/doc/src/snippets/xml/rsslisting/handler.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'doc/src/snippets/xml/rsslisting/handler.cpp')
-rw-r--r--doc/src/snippets/xml/rsslisting/handler.cpp182
1 files changed, 182 insertions, 0 deletions
diff --git a/doc/src/snippets/xml/rsslisting/handler.cpp b/doc/src/snippets/xml/rsslisting/handler.cpp
new file mode 100644
index 0000000000..fe9ef5cbe9
--- /dev/null
+++ b/doc/src/snippets/xml/rsslisting/handler.cpp
@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+handler.cpp
+
+Provides a handler for processing XML elements found by the reader.
+
+The handler looks for <title> and <link> elements within <item> elements,
+and records the text found within them. Link information stored within
+rdf:about attributes of <item> elements is also recorded when it is
+available.
+
+For each item found, a signal is emitted which specifies its title and
+link information. This may be used by user interfaces for the purpose of
+displaying items as they are read.
+*/
+
+#include <QtGui>
+
+#include "handler.h"
+
+/*
+ Reset the state of the handler to ensure that new documents are
+ read correctly.
+
+ We return true to indicate that parsing should continue.
+*/
+
+bool Handler::startDocument()
+{
+ inItem = false;
+ inTitle = false;
+ inLink = false;
+
+ return true;
+}
+
+/*
+ Process each starting element in the XML document.
+
+ Nested item, title, or link elements are not allowed, so we return false
+ if we encounter any of these. We also prohibit multiple definitions of
+ title strings.
+
+ Link destinations are read by this function if they are specified as
+ attributes in item elements.
+
+ For all cases not explicitly checked for, we return true to indicate that
+ the element is acceptable, and that parsing should continue. By doing
+ this, we can ignore elements in which we are not interested.
+*/
+
+bool Handler::startElement(const QString &, const QString &,
+ const QString & qName, const QXmlAttributes &attr)
+{
+ if (qName == "item") {
+
+ if (inItem)
+ return false;
+ else {
+ inItem = true;
+ linkString = attr.value("rdf:about");
+ }
+ }
+ else if (qName == "title") {
+
+ if (inTitle)
+ return false;
+ else if (!titleString.isEmpty())
+ return false;
+ else if (inItem)
+ inTitle = true;
+ }
+ else if (qName == "link") {
+
+ if (inLink)
+ return false;
+ else if (inItem)
+ inLink = true;
+ }
+
+ return true;
+}
+
+/*
+ Process each ending element in the XML document.
+
+ For recognized elements, we reset flags to ensure that we can read new
+ instances of these elements. If we have read an item element, emit a
+ signal to indicate that a new item is available for display.
+
+ We return true to indicate that parsing should continue.
+*/
+
+bool Handler::endElement(const QString &, const QString &,
+ const QString & qName)
+{
+ if (qName == "title" && inTitle)
+ inTitle = false;
+ else if (qName == "link" && inLink)
+ inLink = false;
+ else if (qName == "item") {
+ if (!titleString.isEmpty() && !linkString.isEmpty())
+ emit newItem(titleString, linkString);
+ inItem = false;
+ titleString = "";
+ linkString = "";
+ }
+
+ return true;
+}
+
+/*
+ Collect characters when reading the contents of title or link elements
+ when they occur within an item element.
+
+ We return true to indicate that parsing should continue.
+*/
+
+bool Handler::characters (const QString &chars)
+{
+ if (inTitle)
+ titleString += chars;
+ else if (inLink)
+ linkString += chars;
+
+ return true;
+}
+
+/*
+ Report a fatal parsing error, and return false to indicate to the reader
+ that parsing should stop.
+*/
+
+//! [0]
+bool Handler::fatalError (const QXmlParseException & exception)
+{
+ qWarning() << "Fatal error on line" << exception.lineNumber()
+ << ", column" << exception.columnNumber() << ":"
+ << exception.message();
+
+ return false;
+}
+//! [0]