static ViewColumnNode.IViewColumnNode BuildOrGetColumnNode(ViewTable vTable, Database.MetaColumn metaColumn, string columnName, Operation.ExpressionParsingContext expressionParsingContext)
{
var column = vTable.GetColumnByName(columnName);
if (column == null)
{
var columnNode = (ViewColumnNode.IViewColumnNode)Operation.ColumnCreator.CreateColumn(typeof(ViewColumnNodeTyped <>), metaColumn.Type);
ViewColumnNode viewColumnNode = new ViewColumnNode(vTable, metaColumn, expressionParsingContext);
columnNode.SetColumn(viewColumnNode);
vTable.SetColumn(metaColumn, columnNode.GetColumn());
return(columnNode);
}
// View table use expand column to decorate the IViewColumnNode with required functionality for expanding rows.
// So we need to get the underlying column, which is the IViewColumnNode we want.
if (column is IColumnDecorator)
{
column = (column as IColumnDecorator).GetBaseColumn();
}
if (column is ViewColumnNode.IViewColumnNode)
{
return((ViewColumnNode.IViewColumnNode)column);
}
else
{
throw new Exception("Expecting column '" + vTable.GetName() + "." + metaColumn.Name + "' to be a from a node data type (ViewColumnNode) but is of type '" + column.GetType().Name + "'");
}
}
//Create a column that merge the result of all sub nodes
static public Column BuildColumnNodeMerge(ViewTable vTable, Database.MetaColumn metaColumn, Operation.ExpressionParsingContext expressionParsingContext)
{
var columnNode = (ViewColumnNode.IViewColumnNode)Operation.ColumnCreator.CreateColumn(typeof(ViewColumnNodeMergeTyped <>), metaColumn.Type);
ViewColumnNode viewColumnNode = new ViewColumnNode(vTable, metaColumn, expressionParsingContext);
columnNode.SetColumn(viewColumnNode);
return(columnNode.GetColumn());
}
void ViewColumnNode.IViewColumnNode.SetColumn(ViewColumnNode vc)
{
if (m_ViewColumn != null)
{
throw new InvalidOperationException("Cannot call 'ViewColumn.IViewColumn.SetColumn' once already set");
}
if (vc.viewTable.node.data.type != ViewTable.Builder.Node.Data.DataType.Node)
{
throw new Exception("Cannot set a ViewColumnNodeTyped column on a non-Node data type view table");
}
m_ViewColumn = vc;
entries = new Operation.TypedExpression <DataT> [vc.viewTable.GetNodeChildCount()];
m_Cache.InitDirect(entries.Length);
linkEntries = new TableLink[vc.viewTable.GetNodeChildCount()];
}
void ViewColumnNode.IViewColumnNode.SetColumn(ViewColumnNode vc)
{
m_ViewColumnNode = vc;
}