Added ability to subclass from osg::Object to provide custom user data functionality. A new UserDataContainer provides the

default implementation of the user data functionality.

src/osgWrappers/serializers/osg/UserDataContainer.cpp

@@ -0,0 +1,102 @@
+#include <osg/UserDataContainer>
+
+#include <osgDB/ObjectWrapper>
+#include <osgDB/InputStream>
+#include <osgDB/OutputStream>
+
+static bool checkUDC_UserData( const osg::UserDataContainer& udc )
+{
+    return dynamic_cast<const osg::Object*>(udc.getUserData())!=0;
+}
+
+static bool readUDC_UserData( osgDB::InputStream& is, osg::UserDataContainer& udc )
+{
+    is >> osgDB::BEGIN_BRACKET;
+    osg::Object* object = is.readObject();
+    if(object) udc.setUserData(object);
+    is >> osgDB::END_BRACKET;
+    return true;
+}
+
+static bool writeUDC_UserData( osgDB::OutputStream& os, const osg::UserDataContainer& udc )
+{
+    os << osgDB::BEGIN_BRACKET << std::endl;
+    os.writeObject(dynamic_cast<const osg::Object*>(udc.getUserData()));
+    os << osgDB::END_BRACKET << std::endl;
+    return true;
+}
+
+// _descriptions
+static bool checkUDC_Descriptions( const osg::UserDataContainer& udc )
+{
+    return udc.getNumDescriptions()>0;
+}
+
+static bool readUDC_Descriptions( osgDB::InputStream& is, osg::UserDataContainer& udc )
+{
+    unsigned int size = is.readSize(); is >> osgDB::BEGIN_BRACKET;
+    for ( unsigned int i=0; i<size; ++i )
+    {
+        std::string value;
+        is.readWrappedString( value );
+        udc.addDescription( value );
+    }
+    is >> osgDB::END_BRACKET;
+    return true;
+}
+
+static bool writeUDC_Descriptions( osgDB::OutputStream& os, const osg::UserDataContainer& udc )
+{
+    const osg::Object::DescriptionList& slist = udc.getDescriptions();
+    os.writeSize(slist.size()); os << osgDB::BEGIN_BRACKET << std::endl;
+    for ( osg::Object::DescriptionList::const_iterator itr=slist.begin();
+          itr!=slist.end(); ++itr )
+    {
+        os.writeWrappedString( *itr );
+        os << std::endl;
+    }
+    os << osgDB::END_BRACKET << std::endl;
+    return true;
+}
+
+
+static bool checkUDC_UserObjects( const osg::UserDataContainer& udc )
+{
+    return udc.getNumUserObjects()>0;
+}
+
+static bool readUDC_UserObjects( osgDB::InputStream& is, osg::UserDataContainer& udc )
+{
+    unsigned int size = is.readSize(); is >> osgDB::BEGIN_BRACKET;
+    for( unsigned int i=0; i<size; ++i )
+    {
+        osg::Object* read_object = is.readObject();
+        if (read_object) udc.addUserObject( read_object );
+    }
+    is >> osgDB::END_BRACKET;
+    return true;
+}
+
+static bool writeUDC_UserObjects( osgDB::OutputStream& os, const osg::UserDataContainer& udc )
+{
+    unsigned int numObjects = udc.getNumUserObjects();
+    os.writeSize(numObjects); os << osgDB::BEGIN_BRACKET << std::endl;
+    for ( unsigned int i=0; i<numObjects; ++i )
+    {
+        os << udc.getUserObject(i);
+    }
+    os << osgDB::END_BRACKET << std::endl;
+    return true;
+}
+
+
+
+REGISTER_OBJECT_WRAPPER( UserDataContainer,
+                         new osg::UserDataContainer,
+                         osg::UserDataContainer,
+                         "osg::Object osg::UserDataContainer" )
+{
+    ADD_USER_SERIALIZER( UDC_UserData );  // _userData
+    ADD_USER_SERIALIZER( UDC_Descriptions );  // _descriptions
+    ADD_USER_SERIALIZER( UDC_UserObjects );  // _userData
+}