#include <osg/Group>
#include <osgDB/ObjectWrapper>
#include <osgDB/InputStream>
#include <osgDB/OutputStream>

static bool checkChildren( const osg::Group& node )
{
    return node.getNumChildren()>0;
}

static bool readChildren( osgDB::InputStream& is, osg::Group& node )
{
    unsigned int size = 0; is >> size >> osgDB::BEGIN_BRACKET;
    for ( unsigned int i=0; i<size; ++i )
    {
        osg::ref_ptr<osg::Object> obj = is.readObject();
        osg::Node* child = dynamic_cast<osg::Node*>( obj.get() );
        if ( child ) node.addChild( child );
    }
    is >> osgDB::END_BRACKET;
    return true;
}

static bool writeChildren( osgDB::OutputStream& os, const osg::Group& node )
{
    unsigned int size = node.getNumChildren();
    os << size << osgDB::BEGIN_BRACKET << std::endl;
    for ( unsigned int i=0; i<size; ++i )
    {
        os << node.getChild(i);
    }
    os << osgDB::END_BRACKET << std::endl;
    return true;
}

REGISTER_OBJECT_WRAPPER( Group,
                         new osg::Group,
                         osg::Group,
                         "osg::Object osg::Node osg::Group" )
{
    ADD_USER_SERIALIZER( Children );  // _children
}