private IEnumerable <RowId> SelectDirect <TField>(IField <TRecord, TField> field, TField min, TField max)
{
Debug.Assert(field.Compare(min, max) <= 0);
int version = this.StoreSnapshot.Version;
foreach (RowId rowId in this)
{
TField value = this.table.GetField <TField>(rowId, field, version);
if (field.Compare(value, min) >= 0 && field.Compare(value, max) <= 0)
{
yield return(rowId);
}
}
}
/// <summary>
/// Updates field of the row
/// </summary>
/// <typeparam name="TField">Type of the field</typeparam>
/// <param name="rowId">row id</param>
/// <param name="field">Field to update</param>
/// <param name="value">New value to assign</param>
/// <returns></returns>
public bool SetField <TField>(RowId rowId, IField <TRecord, TField> field, TField value)
{
this.ValidateModification();
this.table.ValidateField(field);
if (field.Compare(this.table.GetLatestField <TField>(rowId, field), value) != 0)
{
List <IIndex <TRecord> > list = this.table.Indexes[field.Order];
if (list != null)
{
foreach (IIndex <TRecord> index in list)
{
// no need to check for timestamp as only one field updated
index.Delete(rowId);
}
}
bool updated = this.table.SetField <TField>(rowId, field, value);
Debug.Assert(updated);
if (list != null)
{
foreach (IIndex <TRecord> index in list)
{
// no need to check for timestamp as only one field updated
index.Insert(rowId);
}
}
return(true);
}
return(false);
}
/// <summary>
/// Updates field of the row
/// </summary>
/// <typeparam name="TField"></typeparam>
/// <param name="rowId"></param>
/// <param name="field"></param>
/// <param name="value"></param>
/// <returns></returns>
public bool SetField <TField>(RowId rowId, IField <TRecord, TField> field, TField value)
{
Debug.Assert(0 <= rowId.Value && rowId.Value < this.table.Count, "broken rowId");
this.ValidateModification();
// It is only possible to set value via basic fields defined on table.
this.ValidateField(field);
ValueList <Row> .Address address = this.table.ItemAddress(rowId.Value);
SnapTable <TRecord> .ValidateModification(ref address);
if (field.Compare(field.GetValue(ref address.Page[address.Index].Data), value) != 0)
{
this.PushToLog(ref address.Page[address.Index], rowId);
field.SetValue(ref address.Page[address.Index].Data, value);
Debug.Assert(field.Compare(field.GetValue(ref address.Page[address.Index].Data), value) == 0, "Assignment or comparison failed");
return(true);
}
return(false);
}
private IEnumerable <RowId> SelectDirect <TField>(IField <TRecord, TField> field, TField value)
{
int version = this.StoreSnapshot.Version;
foreach (RowId rowId in this)
{
if (field.Compare(this.table.GetField <TField>(rowId, field, version), value) == 0)
{
yield return(rowId);
}
}
}
/// <summary>
/// Gets maximum value of the provided field.
/// </summary>
/// <typeparam name="TField"></typeparam>
/// <param name="field"></param>
/// <returns></returns>
public TField Maximum <TField>(IField <TRecord, TField> field)
{
this.table.ValidateField(field);
if (!this.IsEmpty())
{
List <IIndex <TRecord> > list = this.table.Indexes[field.Order];
if (list != null)
{
foreach (IIndex <TRecord> index in list)
{
if (((IFieldHolder)index).Field == field)
{
RangeIndex <TField> rangeIndex = index as RangeIndex <TField>;
if (rangeIndex != null)
{
return(rangeIndex.MaximumValue(this.StoreSnapshot.Version));
}
}
}
}
TField max = field.DefaultValue;
bool first = true;
foreach (RowId rowId in this)
{
if (first)
{
max = this.GetField(rowId, field);
first = false;
}
else
{
TField value = this.GetField(rowId, field);
if (field.Compare(max, value) < 0)
{
max = value;
}
}
}
return(max);
}
return(field.DefaultValue);
}
