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diff --git a/src/datavisualization/data/qbardataitem.cpp b/src/datavisualization/data/qbardataitem.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+#include "qbardataitem_p.h"
+
+QT_DATAVISUALIZATION_BEGIN_NAMESPACE
+
+/*!
+ * \class QBarDataItem
+ * \inmodule QtDataVisualization
+ * \brief The QBarDataItem class provides a container for resolved data to be added to bar graphs.
+ * \since 1.0.0
+ *
+ * A QBarDataItem holds data for a single rendered bar in a graph.
+ * Bar data proxies parse data into QBarDataItem instances for visualizing.
+ *
+ * \sa QBarDataProxy, {Qt Data Visualization 3D C++ Classes}
+ */
+
+/*!
+ * Constructs QBarDataItem.
+ */
+QBarDataItem::QBarDataItem()
+    : d_ptr(0), // private data doesn't exist by default (optimization)
+      m_value(0.0)
+{
+}
+
+/*!
+ * Constructs QBarDataItem with \a value.
+ */
+QBarDataItem::QBarDataItem(qreal value)
+    : d_ptr(0),
+      m_value(value)
+{
+}
+
+/*!
+ * Constructs a copy of \a other.
+ */
+QBarDataItem::QBarDataItem(const QBarDataItem &other)
+{
+    operator=(other);
+}
+
+/*!
+ * Destroys QBarDataItem.
+ */
+QBarDataItem::~QBarDataItem()
+{
+    delete d_ptr;
+}
+
+/*!
+ *  Assigns a copy of \a other to this object.
+ */
+QBarDataItem &QBarDataItem::operator=(const QBarDataItem &other)
+{
+    m_value = other.m_value;
+    if (other.d_ptr)
+        createExtraData();
+    else
+        d_ptr = 0;
+    // TODO set extra data
+    return *this;
+}
+
+/*!
+ * Sets \a value to this data item.
+ */
+void QBarDataItem::setValue(qreal value)
+{
+    m_value = value;
+}
+
+/*!
+ * \return value of this data item.
+ */
+qreal QBarDataItem::value() const
+{
+    return m_value;
+}
+
+/*!
+ * \internal
+ */
+void QBarDataItem::createExtraData()
+{
+    if (!d_ptr)
+        d_ptr = new QBarDataItemPrivate;
+}
+
+QBarDataItemPrivate::QBarDataItemPrivate()
+{
+}
+
+QBarDataItemPrivate::~QBarDataItemPrivate()
+{
+}
+
+QT_DATAVISUALIZATION_END_NAMESPACE