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/****************************************************************************
**
** Copyright (C) 2015 basysKom GmbH, opensource@basyskom.com
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtOpcUa module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later 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 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qopcuaplugin.h"
#include "qopcuaprovider.h"
#include <QtOpcUa/qopcuaclient.h>
#include <QtOpcUa/qopcuanode.h>
#include <QtOpcUa/qopcuatype.h>
#include <private/qopcuanodeimpl_p.h>
#include <private/qfactoryloader_p.h>
#include <QtCore/qjsonarray.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qpluginloader.h>
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(QT_OPCUA, "qt.opcua")
/*!
\class QOpcUaProvider
\inmodule QtOpcUa
\brief QOpcUaProvider creates an instance of QOpcUaClient
QOpcUaProvider allows the user to create an instance of QOpcUaClient by
loading a QOpcUaPlugin using the Qt plugin system.
For the available plugins and their capabilities please refer to the
\l QOpcUaClient documentation.
*/
Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, qOpcualoader,
(QOpcUaProviderFactory_iid, QLatin1String("/opcua")))
/*!
Reads the meta data from the plugins known by the loader.
*/
static QHash<QString, QJsonObject> loadPluginMetadata()
{
QHash<QString, QJsonObject> plugins;
const QFactoryLoader *l = qOpcualoader();
QList<QJsonObject> const meta = l->metaData();
for (int i = 0; i < meta.size(); ++i) {
QJsonObject obj = meta.at(i).value(QStringLiteral("MetaData")).toObject();
obj.insert(QStringLiteral("index"), i);
plugins.insertMulti(obj.value(QStringLiteral("Provider")).toString(), obj);
}
return plugins;
}
/*!
Returns a QHash mapping names to JSON objects containing the meta data of
available plugins.
*/
static QHash<QString, QJsonObject> plugins()
{
static QHash<QString, QJsonObject> plugins;
static bool alreadyDiscovered = false;
if (!alreadyDiscovered) {
plugins = loadPluginMetadata();
alreadyDiscovered = true;
}
return plugins;
}
/*!
Creates a new OPC UA provider with a given \a parent.
*/
QOpcUaProvider::QOpcUaProvider(QObject *parent)
: QObject(parent)
{
qRegisterMetaType<QOpcUa::Types>();
qRegisterMetaType<QOpcUa::TypedVariant>();
qRegisterMetaType<QOpcUa::UaStatusCode>();
qRegisterMetaType<QOpcUaNode::NodeClass>();
qRegisterMetaType<QOpcUa::QQualifiedName>();
qRegisterMetaType<QOpcUaNode::NodeAttribute>();
qRegisterMetaType<QOpcUaNode::NodeAttributes>();
qRegisterMetaType<QOpcUaNode::AttributeMap>();
qRegisterMetaType<QVector<QOpcUaReadResult>>();
qRegisterMetaType<QOpcUaClient::ClientState>();
qRegisterMetaType<QOpcUaClient::ClientError>();
qRegisterMetaType<uintptr_t>("uintptr_t");
}
QOpcUaProvider::~QOpcUaProvider()
{
qDeleteAll(m_plugins);
}
static QOpcUaPlugin *loadPlugin(const QString &key)
{
const int index = qOpcualoader()->indexOf(key);
if (index != -1) {
QObject *factoryObject = qOpcualoader()->instance(index);
if (QOpcUaPlugin *plugin = qobject_cast<QOpcUaPlugin *>(factoryObject)) {
return plugin;
}
}
return nullptr;
}
/*!
Returns a pointer to a QOpcUaClient object by loading the selected \a backend
as a plugin and creating a client object.
If the plugin loading fails, 0 is returned instead.
The user is responsible for deleting the returned \l QOpcUaClient object
when it is no longer needed.
*/
QOpcUaClient *QOpcUaProvider::createClient(const QString &backend)
{
QOpcUaPlugin *plugin;
auto it = m_plugins.find(backend);
if (it == m_plugins.end()) {
plugin = loadPlugin(backend);
if (!plugin) {
qCWarning(QT_OPCUA) << "Failed to load OPC UA plugin:" << backend;
qCWarning(QT_OPCUA) << "Available plugins:" << availableBackends();
return nullptr;
}
m_plugins.insert(backend, plugin);
}
else {
plugin = it.value();
}
return plugin->createClient();
}
/*!
Returns a QStringList of available plugins.
*/
QStringList QOpcUaProvider::availableBackends()
{
return plugins().keys();
}
QT_END_NAMESPACE
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