/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying

** this package.

**

** 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

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**

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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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****************************************************************************/

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

#ifndef Patternist_AccelTreeResourceLoader_H

#define Patternist_AccelTreeResourceLoader_H

#include <QtCore/QEventLoop>

#include <QtNetwork/QNetworkReply>

#include "qabstractxmlreceiver.h"

#include "qacceltree_p.h"

#include "qacceltreebuilder_p.h"

#include "qdeviceresourceloader_p.h"

#include "qnamepool_p.h"

#include "qnetworkaccessdelegator_p.h"

#include "qreportcontext_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QIODevice;

namespace QPatternist

{

    /**

     * @short An helper class which enables QNetworkAccessManager

     * to be used in a blocking manner.

     *

     * @see AccelTreeResourceLoader::load()

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class NetworkLoop : public QEventLoop

    {

        Q_OBJECT

    public:

        NetworkLoop() : m_hasReceivedError(false)

        {

        }

    public Q_SLOTS:

        void error(QNetworkReply::NetworkError code)

        {

            Q_UNUSED(code);

            m_hasReceivedError = true;

            exit(1);

        }

        void finished()

        {

            if(m_hasReceivedError)

                exit(1);

            else

                exit(0);

        }

    private:

        bool m_hasReceivedError;

    };

    /**

     * @short Handles requests for documents, and instantiates

     * them as AccelTree instances.

     *

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class Q_AUTOTEST_EXPORT AccelTreeResourceLoader : public DeviceResourceLoader

    {

    public:

        /**

         * Describes the behaviour of the resource loader in case of an

         * error.

         */

        enum ErrorHandling

        {

            FailOnError,        ///< The resource loader will report the error via the report context.

            ContinueOnError     ///< The resource loader will report no error and return an empty QNetworkReply.

        };

        /**

         * AccelTreeResourceLoader does not own @p context.

         */

        AccelTreeResourceLoader(const NamePool::Ptr &np,

                                const NetworkAccessDelegator::Ptr &networkDelegator, AccelTreeBuilder<true>::Features = AccelTreeBuilder<true>::NoneFeature);

        virtual Item openDocument(const QUrl &uri,

                                  const ReportContext::Ptr &context);

        virtual Item openDocument(QIODevice *source, const QUrl &documentUri,

                                  const ReportContext::Ptr &context);

        virtual SequenceType::Ptr announceDocument(const QUrl &uri, const Usage usageHint);

        virtual bool isDocumentAvailable(const QUrl &uri);

        virtual bool isUnparsedTextAvailable(const QUrl &uri,

                                             const QString &encoding);

        virtual Item openUnparsedText(const QUrl &uri,

                                      const QString &encoding,

                                      const ReportContext::Ptr &context,

                                      const SourceLocationReflection *const where);

        /**

         * @short Helper function that do NetworkAccessDelegator::get(), but

         * does it blocked.

         *

         * The returned QNetworkReply has emitted QNetworkReply::finished().

         *

         * The caller owns the return QIODevice instance.

         *

         * @p context may be @c null or valid. If @c null, no error reporting

         * is done and @c null is returned.

         *

         * @see NetworkAccessDelegator

         */

        static QNetworkReply *load(const QUrl &uri,

                                   QNetworkAccessManager *const networkManager,

                                   const ReportContext::Ptr &context, ErrorHandling handling = FailOnError);

        /**

         * @overload

         */

        static QNetworkReply *load(const QUrl &uri,

                                   const NetworkAccessDelegator::Ptr &networkDelegator,

                                   const ReportContext::Ptr &context, ErrorHandling handling = FailOnError);

        /**

         * @short Returns the URIs this AccelTreeResourceLoader has loaded

         * which are for devices through variable bindings.

         */

        virtual QSet<QUrl> deviceURIs() const;

        virtual void clear(const QUrl &uri);

    private:

        static bool streamToReceiver(QIODevice *const dev,

                                     AccelTreeBuilder<true> *const receiver,

                                     const NamePool::Ptr &np,

                                     const ReportContext::Ptr &context,

                                     const QUrl &uri);

        bool retrieveDocument(const QUrl &uri,

                              const ReportContext::Ptr &context);

        bool retrieveDocument(QIODevice *source, const QUrl &documentUri,

                              const ReportContext::Ptr &context);

        /**

         * If @p context is @c null, no error reporting should be done.

         */

        bool retrieveUnparsedText(const QUrl &uri,

                                  const QString &encoding,

                                  const ReportContext::Ptr &context,

                                  const SourceLocationReflection *const where);

        QHash<QUrl, AccelTree::Ptr>             m_loadedDocuments;

        const NamePool::Ptr                     m_namePool;

        const NetworkAccessDelegator::Ptr       m_networkAccessDelegator;

        QHash<QPair<QUrl, QString>, QString>    m_unparsedTexts;

        AccelTreeBuilder<true>::Features        m_features;

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif