// Copyright 2009, 2010  Jens-Michael Hoffmann <jmho@c-xx.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either 
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public 
// License along with this library.  If not, see <http://www.gnu.org/licenses/>.

#include "DgmlDownloadPolicyTagHandler.h"

#include "DgmlAttributeDictionary.h"
#include "DgmlElementDictionary.h"
#include "GeoParser.h"
#include "GeoSceneTexture.h"

#include "global.h"

namespace Marble
{
namespace dgml
{
static GeoTagHandlerRegistrar handler( GeoTagHandler::QualifiedName( dgmlTag_DownloadPolicy,
                                                                     dgmlTag_nameSpace20 ),
                                       new DgmlDownloadPolicyTagHandler );

// Error handling:
// Here it is not possible to return an error code or throw an exception
// so in case of an error we just ignore the element.

GeoNode* DgmlDownloadPolicyTagHandler::parse( GeoParser& parser ) const
{
    // Check whether the tag is valid
    Q_ASSERT( parser.isStartElement() && parser.isValidElement( dgmlTag_DownloadPolicy ));

    // Checking for parent item
    GeoStackItem parentItem = parser.parentElement();
    if ( !parentItem.represents( dgmlTag_Texture )) {
        qCritical( "Parse error: parent element is not 'texture'" );
        return 0;
    }

    // Attribute usage
    DownloadUsage usage;
    const QString usageStr = parser.attribute( dgmlAttr_usage ).trimmed();
    if ( usageStr == "Browse" )
        usage = DownloadBrowse;
    else if ( usageStr == "Bulk" )
        usage = DownloadBulk;
    else {
        qCritical( "Parse error: invalid attribute downloadPolicy/@usage" );
        return 0;
    }

    // Attribute maximumConnections
    const QString maximumConnectionsStr = parser.attribute( dgmlAttr_maximumConnections ).trimmed();
    bool ok;
    const int maximumConnections = maximumConnectionsStr.toInt( &ok );
    if ( !ok ) {
        qCritical( "Parse error: invalid attribute downloadPolicy/@maximumConnections" );
        return 0;
    }

    parentItem.nodeAs<GeoSceneTexture>()->addDownloadPolicy( usage, maximumConnections );
    return 0;
}

}
}
