private void MakeDistinct([NotNull] SelectDataTable dataTable)
{
var hash = new List <Pair <int, SelectItem> >();
foreach (var selectItem in dataTable.Items)
{
var hashValue = GetHashValue(selectItem);
var pair = new Pair <int, SelectItem>(hashValue, selectItem);
hash.Add(pair);
}
hash.Sort((p0, p1) => p0.Part1 == p1.Part1 ? 0 : p0.Part1 > p1.Part1 ? 1 : -1);
for (var index = hash.Count - 2; index >= 0; index--)
{
if (hash[index].Part1 == hash[index + 1].Part1)
{
hash.RemoveAt(index + 1);
}
}
dataTable.Items.Clear();
dataTable.Items.AddRange(hash.Select(p => p.Part2));
}
public override object Evaluate([NotNull] Query query, [NotNull] QueryContext contextNode)
{
Assert.ArgumentNotNull(query, nameof(query));
Assert.ArgumentNotNull(contextNode, nameof(contextNode));
var result = new SelectDataTable();
BuildColumns(result);
object o = contextNode;
var from = From;
if (from != null)
{
o = query.Evaluate(from, contextNode);
if (o == null)
{
return(result);
}
}
var list = o as QueryContext[];
if (list != null)
{
foreach (var context in list)
{
if (!AddBatchScriptItem(query, result, context.GetQueryContextItem(), list.Count()))
{
break;
}
}
if (IsDistinct)
{
MakeDistinct(result);
}
if (OrderBy.Any())
{
Sort(result);
}
return(result);
}
var instance = o as QueryContext;
if (instance != null)
{
AddBatchScriptItem(query, result, instance.GetQueryContextItem(), 1);
}
return(result);
}
private void FormatTable([NotNull] XmlTextWriter output, [NotNull] SelectDataTable selectDataTable)
{
Debug.ArgumentNotNull(output, nameof(output));
Debug.ArgumentNotNull(selectDataTable, nameof(selectDataTable));
output.WriteStartElement("columns");
foreach (var column in selectDataTable.Columns)
{
output.WriteStartElement("column");
output.WriteAttributeString("name", column.Header);
output.WriteAttributeString("isreadonly", column.IsReadOnly ? "true" : "false");
output.WriteEndElement();
}
output.WriteEndElement();
output.WriteStartElement("rows");
foreach (var item in selectDataTable.Items)
{
output.WriteStartElement("row");
output.WriteAttributeString("id", item.Item.ID.ToString());
output.WriteAttributeString("language", item.Item.Language.Name);
output.WriteAttributeString("name", item.Item.Name);
output.WriteAttributeString("path", item.Item.Paths.Path);
foreach (var field in item.Fields)
{
output.WriteStartElement("value");
output.WriteAttributeString("name", field.ColumnName);
if (field.Field != null)
{
output.WriteAttributeString("id", field.Field.ID.ToString());
}
output.WriteValue(field.Value);
output.WriteEndElement();
}
output.WriteEndElement();
}
output.WriteEndElement();
}
private void BuildColumns([NotNull] SelectDataTable result)
{
Debug.ArgumentNotNull(result, nameof(result));
var columnIndex = 0;
foreach (var columnExpression in ColumnExpressions)
{
var columnName = columnExpression.ColumnName;
if (string.IsNullOrEmpty(columnName))
{
columnName = "Column " + columnIndex;
columnIndex++;
}
var column = new SelectColumn
{
Header = columnName,
IsReadOnly = string.IsNullOrEmpty(columnExpression.FieldName)
};
result.Columns.Add(column);
}
}
private void Sort([NotNull] SelectDataTable dataTable)
{
dataTable.Items.Sort(Compare);
}
private bool AddBatchScriptItem([NotNull] Query query, [NotNull] SelectDataTable dataTable, [NotNull] Item item, int count)
{
Debug.ArgumentNotNull(dataTable, nameof(dataTable));
Debug.ArgumentNotNull(item, nameof(item));
var result = true;
var selectItem = new SelectItem
{
Item = item
};
var columnIndex = 0;
foreach (var columnExpression in ColumnExpressions)
{
var selectField = new SelectField();
if (columnExpression.FieldName != null)
{
selectField.Value = item[columnExpression.FieldName];
selectField.Field = item.Fields[columnExpression.FieldName];
}
else if (columnExpression.Expression != null)
{
var value = query.EvaluateSubQuery(columnExpression.Expression, item);
if (value != null)
{
selectField.Value = value.ToString();
}
else
{
var function = columnExpression.Expression as Function;
if (function != null && string.Compare(function.Name, "count", StringComparison.InvariantCultureIgnoreCase) == 0)
{
selectField.Value = count.ToString();
result = false;
}
else
{
selectField.Value = "<null>";
}
}
}
var columnName = columnExpression.ColumnName;
if (string.IsNullOrEmpty(columnName))
{
columnName = "Column " + columnIndex;
columnIndex++;
}
selectField.ColumnName = columnName;
selectItem.Fields.Add(selectField);
}
dataTable.Items.Add(selectItem);
return(result);
}
