SFNode.h

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//    Copyright 2004, SenseGraphics AB
//
//    This file is part of H3D API.
//
//    H3D API is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    H3D API 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 General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with H3D API; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//    A commercial license is also available. Please contact us at 
//    www.sensegraphics.com for more information.
//
//
//
#ifndef __SFNODE_H__
#define __SFNODE_H__

#include "FieldTemplates.h"
#include "RefCountSField.h"
#include "Node.h"

namespace H3D {
  

  class H3DAPI_API SFNode: 
    public RefCountSField< Node,
                           TypedField< Field,
                                       void, 
                                       AnyNumber< SFNode > > > {
  public:   
    SFNode() {}
    
    SFNode( Node *_value ):
      RefCountSField< Node,
                      TypedField< Field,
                                  void, 
                                  AnyNumber< SFNode > > > ( _value ) {}
    
    virtual string getTypeName() {
      return classTypeName();
    }
    
    static string classTypeName() {
      return "SFNode";
    }


    virtual X3DTypes::X3DType getX3DType() { return X3DTypes::SFNODE; }
 
  protected:
    virtual Node *preOnAdd( Node *n ) {
      Node *pn = getPrototypeNode( n );
      if( pn ) return pn;
      else return n;
    }
    
    virtual Node *preOnRemove( Node *n ) {
      Node *pn = getPrototypeNode( n );
      if( pn ) return pn;
      else return n;
    }

    Node *getPrototypeNode( Node *n );
  };


  template< class NodeType >
  class TypedSFNode: public SFNode {
  protected:
    typedef NodeType typed_class_type;
    typedef NodeType * typed_value_type;

    void onAdd( Node *n) {
      if( !dynamic_cast< NodeType * >( n ) ) {
        Node *pi = getPrototypeNode( n );
        if( !dynamic_cast< NodeType * >( pi ) ) {
          stringstream s;
          s << "Expecting " << typeid( NodeType ).name();
          throw InvalidNodeType( n->getTypeName(),
                                 s.str(),
                                 H3D_FULL_LOCATION );
        }
      }
      SFNode::onAdd( n );
    }
  public:
    virtual NodeType *getValue( int id = 0 ) {
      return getCastedValue( id );
    }

    virtual NodeType *getCastedValue( int id = 0 ) {
      Node *n = SFNode::getValue( id );
      Node *pn = getPrototypeNode( n );
      if( pn ) 
        return static_cast< NodeType * >( pn );
      else
        return static_cast< NodeType * >( n );
    }

  };

  template< class Type >
  class TypedSFNodeObject: public SFNode {
  protected:
    void onAdd( Node *n) {
      if( !dynamic_cast< Type * >( n ) ) {
        Node *pi = getPrototypeNode( n );
        if( !dynamic_cast< Type * >( pi ) ) {
          stringstream s;
          s << "Expecting " << typeid( Type ).name();
          throw InvalidNodeType( n->getTypeName(),
                                 s.str(),
                                 H3D_FULL_LOCATION );
        }
      } 
      SFNode::onAdd( n );
    }
  public:
    virtual Type *getCastedValue( int id = 0 ) {
      Node *n = SFNode::getValue( id );
      Node *pn = getPrototypeNode( n );
      if( pn ) 
        return reinterpret_cast< Type * >( pn );
      else
        return reinterpret_cast< Type * >( n );
    }
  };
}
#endif

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