/// <summary>
/// Creates a Range set build and pre calculates the effective
/// tables ranges for use later when building a BatchRangeSet.
/// </summary>
/// <param name="idFormat">
/// The id format for the SyncIds
/// </param>
/// <param name="tableNames">
/// All the table names in that will be in the sum of the
/// batches. Order does not matter.
/// </param>
public BatchRangeSetBuilder(SyncIdFormat idFormat, List <string> tableNames)
{
_tableRanges = new Dictionary <string, BatchRange>(tableNames.Count);
_idFormat = idFormat;
int numTables = tableNames.Count;
SortedList <SyncId, string> tablesSortedBySyncId
= new SortedList <SyncId, string>(numTables);
List <object> emptyPkVals = new List <object>(0);
foreach (string curTable in tableNames)
{
SyncId idBeforeTable = SyncUtil.InitRowId(curTable, emptyPkVals);
tablesSortedBySyncId.Add(idBeforeTable, curTable);
}
// for each table we need to determine the:
// - starting SyncId (zero or first id in table)
// - ending SyncId (just before next table or infinity)
BatchRange prevTableRange = null;
foreach (KeyValuePair <SyncId, string> curElem in tablesSortedBySyncId)
{
BatchRange curTableRange = new BatchRange();
curTableRange.TableName = curElem.Value;
// assume this is the last table and then fix this if
// there is another table
curTableRange.End = _idFormat.Infinity;
if (prevTableRange == null)
{
// first table starts at zero
curTableRange.Start = _idFormat.Zero;
}
else
{
// fix up prev end to be correct
// set it's end to be one before current tables
// starting SyncId
prevTableRange.End = curElem.Key;
curTableRange.Start = IdPlusOne(_idFormat, curElem.Key);
}
prevTableRange = curTableRange;
_tableRanges.Add(curTableRange.TableName, curTableRange);
}
}
/// <summary>
/// Creates syncid plus one. This method matches the method in
/// ./sync/src/xproc/knowledge/SyncId.cpp -> SyncId::InitializeByIncrement()
/// </summary>
/// <param name="idFormat">
/// The item id format information.
/// </param>
/// <param name="origId">
/// The SyncId that we want the "plus one" for.
/// </param>
static public SyncId IdPlusOne(SyncIdFormat idFormat, SyncId origId)
{
Debug.Assert(origId.IsVariableLength == idFormat.IsVariableLength);
byte[] origBytes = origId.RawId;
int idSize;
byte[] idBytes;
// first figure out what the length of the new id should
// be in bytes.
if (!idFormat.IsVariableLength)
{
idSize = origBytes.Length;
}
else if (origBytes.Length < idFormat.Length)
{
// we'll just append a 0 in this case
idSize = origBytes.Length + 1;
}
else
{
// if 0xFF at the end will turn into 0s; we'll want to drop them
for (idSize = origBytes.Length;
0xFF == origBytes[idSize - 1];
--idSize)
{
;
}
}
idBytes = new byte[idSize];
Array.Copy(origBytes,
idBytes,
Math.Min(origBytes.Length, idBytes.Length));
if (idFormat.IsVariableLength)
{
if (origBytes.Length < idFormat.Length)
{
// just append 0
idBytes[idSize - 1] = 0;
}
else
{
idBytes[idSize - 1] += 1;
}
}
else
{
// if we are fixed length
// increment LSB and carry if needed
for (int cur_index = idSize - 1; ; cur_index -= 1)
{
if (idBytes[cur_index] == 0xFF)
{
idBytes[cur_index] = 0;
}
else
{
idBytes[cur_index] += 1;
break;
}
}
}
return(new SyncId(idBytes, idFormat.IsVariableLength));
}
/// <summary>
/// Creates syncid plus one. This method matches the method in
/// ./sync/src/xproc/knowledge/SyncId.cpp -> SyncId::InitializeByIncrement()
/// </summary>
/// <param name="idFormat">
/// The item id format information.
/// </param>
/// <param name="origId">
/// The SyncId that we want the "plus one" for.
/// </param>
static public SyncId IdPlusOne( SyncIdFormat idFormat, SyncId origId )
{
Debug.Assert( origId.IsVariableLength == idFormat.IsVariableLength );
byte[] origBytes = origId.RawId;
int idSize;
byte[] idBytes;
// first figure out what the length of the new id should
// be in bytes.
if (!idFormat.IsVariableLength)
{
idSize = origBytes.Length;
}
else if (origBytes.Length < idFormat.Length)
{
// we'll just append a 0 in this case
idSize = origBytes.Length + 1;
}
else
{
// if 0xFF at the end will turn into 0s; we'll want to drop them
for (idSize = origBytes.Length;
0xFF == origBytes[idSize - 1];
--idSize);
}
idBytes = new byte[idSize];
Array.Copy(origBytes,
idBytes,
Math.Min( origBytes.Length, idBytes.Length));
if (idFormat.IsVariableLength)
{
if (origBytes.Length < idFormat.Length)
{
// just append 0
idBytes[idSize - 1] = 0;
}
else
{
idBytes[idSize - 1] += 1;
}
}
else
{
// if we are fixed length
// increment LSB and carry if needed
for( int cur_index = idSize-1; ;cur_index -= 1 )
{
if( idBytes[cur_index] == 0xFF )
{
idBytes[cur_index] = 0;
} else {
idBytes[cur_index] += 1;
break;
}
}
}
return new SyncId( idBytes, idFormat.IsVariableLength );
}
/// <summary>
/// Creates a Range set build and pre calculates the effective
/// tables ranges for use later when building a BatchRangeSet.
/// </summary>
/// <param name="idFormat">
/// The id format for the SyncIds
/// </param>
/// <param name="tableNames">
/// All the table names in that will be in the sum of the
/// batches. Order does not matter.
/// </param>
public BatchRangeSetBuilder( SyncIdFormat idFormat, List<string> tableNames )
{
_tableRanges = new Dictionary<string, BatchRange>( tableNames.Count );
_idFormat = idFormat;
int numTables = tableNames.Count;
SortedList<SyncId,string> tablesSortedBySyncId
= new SortedList<SyncId,string>(numTables);
List<object> emptyPkVals = new List<object>(0);
foreach( string curTable in tableNames )
{
SyncId idBeforeTable = SyncUtil.InitRowId( curTable, emptyPkVals );
tablesSortedBySyncId.Add( idBeforeTable, curTable );
}
// for each table we need to determine the:
// - starting SyncId (zero or first id in table)
// - ending SyncId (just before next table or infinity)
BatchRange prevTableRange = null;
foreach( KeyValuePair<SyncId,string> curElem in tablesSortedBySyncId )
{
BatchRange curTableRange = new BatchRange();
curTableRange.TableName = curElem.Value;
// assume this is the last table and then fix this if
// there is another table
curTableRange.End = _idFormat.Infinity;
if( prevTableRange == null )
{
// first table starts at zero
curTableRange.Start = _idFormat.Zero;
}
else
{
// fix up prev end to be correct
// set it's end to be one before current tables
// starting SyncId
prevTableRange.End = curElem.Key;
curTableRange.Start = IdPlusOne( _idFormat, curElem.Key );
}
prevTableRange = curTableRange;
_tableRanges.Add( curTableRange.TableName, curTableRange );
}
}
