dap4/d4cdm/src/main/java/dap4/cdm/CDMUtil.java
static public NetcdfFile unwrapfile(NetcdfFile file)
    {
        for(; ; ) {
            if(file instanceof NetcdfDataset) {
                NetcdfDataset ds = (NetcdfDataset) file;
                file = ds.getReferencedFile();
                if(file == null) break;
            } else break;
        }
        return file;
    }
static public NetcdfFile unwrapfile(NetcdfFile file)
    {
        for(; ; ) {
            if(file instanceof NetcdfDataset) {
                NetcdfDataset ds = (NetcdfDataset) file;
                file = ds.getReferencedFile();
                if(file == null) break;
            } else break;
        }
        return file;
    }
static public NetcdfFile unwrapfile ( NetcdfFile file ) { for ( ; ; ) { if ( file instanceof NetcdfDataset ) { NetcdfDataset ds = ( NetcdfDataset ) file ; file = ds . getReferencedFile ( ) ; if ( file == null ) break ; } else break ; } return file ; }
NetcdfDataset can wrap a NetcdfFile.
Goal of this procedure is to get down to the
lowest level NetcdfFile instance.

@param file NetcdfFile or NetcdfDataset
@return the lowest level NetcdfFile instance
NetcdfDataset can wrap a NetcdfFile . Goal of this procedure is to get down to the lowest level NetcdfFile instance .