/// <summary>
/// Since LinkDataView does not support multiple selectors/comparers, it does not make sense for
/// them to Find using multiple keys.
/// This overriden method prevents users calling multi-key find on dataview.
/// </summary>
internal override int FindByKey(object[] key)
{
// must have string or expression based sort specified
if (base.SortComparison == null && String.IsNullOrEmpty(base.Sort))
{
// This is the exception message from DataView that we want to use
throw ExceptionBuilder.IndexKeyLength(0, 0);
}
else if (base.SortComparison != null && key.Length != sortExpressionBuilder.Count)
{
throw DataSetUtil.InvalidOperation(SR.Format(SR.LDV_InvalidNumOfKeys, sortExpressionBuilder.Count));
}
if (base.SortComparison == null)
{
// using string to sort
return(base.FindByKey(key));
}
else
{
Index.ComparisonBySelector <object, DataRow> compareDelg =
new Index.ComparisonBySelector <object, DataRow>(comparerKeyRow);
List <object> keyList = new List <object>();
foreach (object singleKey in key)
{
keyList.Add(singleKey);
}
Range range = FindRecords <object, DataRow>(compareDelg, keyList);
return((range.Count == 0) ? -1 : range.Min);
}
}
/// <summary>
/// Searches the index and finds a single row where the sort-key matches the input key
/// </summary>
/// <param name="key">Value of the key to find</param>
/// <returns>Index of the first match of input key</returns>
internal override int FindByKey(object key)
{
Debug.Assert(base.Sort != null);
Debug.Assert(!(!String.IsNullOrEmpty(base.Sort) && base.SortComparison != null),
"string and expression based sort cannot both be set");
if (!String.IsNullOrEmpty(base.Sort)) // use find for DV's sort string
{
return(base.FindByKey(key));
}
else if (base.SortComparison == null) // neither string or expr set
{
// This is the exception message from DataView that we want to use
throw ExceptionBuilder.IndexKeyLength(0, 0);
}
else // find for expression based sort
{
if (sortExpressionBuilder.Count != 1)
{
throw DataSetUtil.InvalidOperation(SR.Format(SR.LDV_InvalidNumOfKeys, sortExpressionBuilder.Count));
}
Index.ComparisonBySelector <object, DataRow> compareDelg =
new Index.ComparisonBySelector <object, DataRow>(comparerKeyRow);
List <object> keyList = new List <object>();
keyList.Add(key);
Range range = FindRecords <object, DataRow>(compareDelg, keyList);
return((range.Count == 0) ? -1 : range.Min);
}
}
/// <summary>
/// Searches the index and finds a single row where the sort-key matches the input key
/// </summary>
/// <param name="key">Value of the key to find</param>
/// <returns>Index of the first match of input key</returns>
internal override int FindByKey(object key)
{
/////////////// Preconditions ////////////////
//check that both string and expression based sort are never simultaneously set
Debug.Assert(base.Sort != null);
Debug.Assert(!(!String.IsNullOrEmpty(base.Sort) && base.SortComparison != null));
/////////////////////////////////////////////
if (!String.IsNullOrEmpty(base.Sort)) //use find for DV's sort string
{
return base.FindByKey(key);
}
else if (base.SortComparison == null) //neither string or expr set
{
//This is the exception message from DataView that we want to use
throw ExceptionBuilder.IndexKeyLength(0, 0);
}
else //find for expression based sort
{
if (sortExpressionBuilder.Count !=1)
throw DataSetUtil.InvalidOperation(Strings.LDV_InvalidNumOfKeys(sortExpressionBuilder.Count));
Index.ComparisonBySelector<object, DataRow> compareDelg =
new Index.ComparisonBySelector<object, DataRow>(comparerKeyRow);
List<object> keyList = new List<object>();
keyList.Add(key);
Range range = FindRecords<object, DataRow>(compareDelg, keyList);
return (range.Count == 0) ? -1 : range.Min;
}
}
/// <summary>
/// Since LinkDataView does not support multiple selectors/comparers, it does not make sense for
/// them to Find using multiple keys.
/// This overriden method prevents users calling multi-key find on dataview.
/// </summary>
internal override int FindByKey(object[] key)
{
//---------Checks ----------------
//must have string or expression based sort specified
if (base.SortComparison == null && String.IsNullOrEmpty(base.Sort))
{
//This is the exception message from DataView that we want to use
throw ExceptionBuilder.IndexKeyLength(0, 0);
}
else if (base.SortComparison != null && key.Length != sortExpressionBuilder.Count)
{
throw DataSetUtil.InvalidOperation(Strings.LDV_InvalidNumOfKeys(sortExpressionBuilder.Count));
}
//--------------------------------
if (base.SortComparison == null)//using string to sort
return base.FindByKey(key);
else
{
Index.ComparisonBySelector<object, DataRow> compareDelg =
new Index.ComparisonBySelector<object, DataRow>(comparerKeyRow);
List<object> keyList = new List<object>();
foreach (object singleKey in key)
{
keyList.Add(singleKey);
}
Range range = FindRecords<object, DataRow>(compareDelg, keyList);
return (range.Count == 0) ? -1 : range.Min;
}
}
/// <summary>This method exists for LinqDataView to keep a level of abstraction away from the RBTree</summary>
internal Range FindRecords <TKey, TRow>(Index.ComparisonBySelector <TKey, TRow> comparison, TKey key) where TRow : DataRow
{
return(_index.FindRecords(comparison, key));
}