/// <summary> scans a Grib file to gather information that could be used to
/// create an index or dump the metadata contents.
///
/// </summary>
/// <param gridTemplateName="getProducts">products have enough information for data extractions
/// </param>
/// <param gridTemplateName="oneRecord">returns after processing one record in the Grib file
/// </param>
/// <throws> NotSupportedException </throws>
public void scan(bool getProducts, bool oneRecord)
{
long start = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
// stores the number of times a particular GDS is used
//UPGRADE_TODO: Class 'java.util.HashMap' was converted to 'System.Collections.Hashtable' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javautilHashMap'"
System.Collections.Hashtable gdsCounter = new System.Collections.Hashtable();
Grib1ProductDefinitionSection pds = null;
Grib1GridDefinitionSection gds = null;
long startOffset = -1;
//System.out.println("file position =" + gribStream.Position);
while (raf.Position < raf.Length)
{
if (seekHeader(raf, raf.Length, out startOffset))
{
// Read Section 0 Indicator Section
Grib1IndicatorSection is_Renamed = new Grib1IndicatorSection(raf);
//System.out.println( "Grib record lengthOfSection=" + is.getGribLength());
// EOR (EndOfRecord) calculated so skipping data sections is faster
long EOR = raf.Position + is_Renamed.GribLength - is_Renamed.Length;
// Read Section 1 Product Definition Section PDS
pds = new Grib1ProductDefinitionSection(raf);
if (pds.LengthErr)
continue;
if (pds.gdsExists())
{
// Read Section 2 Grid Definition Section GDS
gds = new Grib1GridDefinitionSection(raf);
}
else
{
// GDS doesn't exist so make one
//System.out.println("GribRecord: No GDS included.");
//System.out.println("Process ID:" + pds.getProcess_Id() );
//System.out.println("Grid ID:" + pds.getGrid_Id() );
gds = (Grib1GridDefinitionSection) new Grib1Grid(pds);
}
// obtain BMS or BDS offset in the file for this product
long dataOffset = 0;
if (pds.Center == 98)
{
// check for ecmwf offset by 1 bug
int length = (int)GribNumbers.uint3(raf); // should be lengthOfSection of BMS
if ((length + raf.Position) < EOR)
{
dataOffset = raf.Position - 3; // ok
}
else
{
dataOffset = raf.Position - 2;
}
}
else
{
dataOffset = raf.Position;
}
// position filePointer to EndOfRecord
raf.Seek(EOR, System.IO.SeekOrigin.Begin);
//System.out.println("file offset = " + gribStream.Position);
// assume scan ok
if (getProducts)
{
Grib1Product gp = new Grib1Product(header, pds, getGDSkey(gds, gdsCounter), dataOffset, raf.Position);
products.Add(gp);
}
else
{
Grib1Record gr = new Grib1Record(header, is_Renamed, pds, gds, dataOffset, raf.Position, startOffset);
records.Add(gr);
}
if (oneRecord)
return ;
// early return because ending "7777" missing
if (raf.Position > raf.Length)
{
raf.Seek(0, System.IO.SeekOrigin.Begin);
System.Console.Error.WriteLine("Grib1Input: possible file corruption");
checkGDSkeys(gds, gdsCounter);
return ;
}
} // end if seekHeader
//System.out.println( "gribStream.Position=" + gribStream.Position);
//System.out.println( "gribStream.Length=" + gribStream.Length );
} // end while gribStream.Position < gribStream.Length
//System.out.println("GribInput: processed in " +
// (System.currentTimeMillis()- start) + " milliseconds");
checkGDSkeys(gds, gdsCounter);
return ;
}
public Grib1Record(System.String hdr, Grib1IndicatorSection aIs, Grib1ProductDefinitionSection aPds, Grib1GridDefinitionSection aGds, long offset, long recOffset, long startOfRecordOffset)
{
header = hdr;
is_Renamed = aIs;
pds = aPds;
gds = aGds;
dataOffset = offset;
endRecordOffset = recOffset;
recordOffset = startOfRecordOffset;
}