public virtual DcColumn CreateColumn(DcSchemaKind schemaType, string name, DcTable input, DcTable output, bool isKey)
{
Debug.Assert(!String.IsNullOrEmpty(name), "Wrong use: column name cannot be null or empty.");
// TODO: Check constraints: 1. only one super-column can exist 2. no loops can appear
DcSchemaKind inSchemaType = input.Schema.GetSchemaKind();
DcSchemaKind outSchemaType = output.Schema.GetSchemaKind();
DcColumn column;
//
// We create a column according to its table type
//
if (schemaType == DcSchemaKind.Dc) // Column belongs to a normal table
{
column = new Column(name, input, output, isKey, false);
}
else if (schemaType == DcSchemaKind.Csv) // Column belongs to a CSV table
{
column = new ColumnCsv(name, input, output, isKey, false);
}
else
{
throw new NotImplementedException("This schema type is not implemented.");
}
/* OLD - here we create a column according to import-export status
* if (inSchemaType == DcSchemaKind.Dc || outSchemaType == DcSchemaKind.Dc) // Intra-mashup or import/export columns
* {
* column = new Column(name, input, output, isKey, false);
* }
* else if (inSchemaType == DcSchemaKind.Csv && outSchemaType == DcSchemaKind.Csv) // Intra-csv columns
* {
* column = new ColumnCsv(name, input, output, isKey, false);
* }
* else if (inSchemaType == DcSchemaKind.Oledb && outSchemaType == DcSchemaKind.Oledb) // Intra-oledb columns
* {
* throw new NotImplementedException("This schema type is not implemented.");
* }
* else if (inSchemaType == DcSchemaKind.Rel && outSchemaType == DcSchemaKind.Rel) // Intra-rel columns
* {
* column = new ColumnRel(name, input, output, isKey, false);
* }
* else
* {
* throw new NotImplementedException("This schema type is not implemented.");
* }
*/
_columns.Add(column);
NotifyAdd(column);
return(column);
}
public virtual DcTable CreateTable(DcSchemaKind schemaType, string name, DcTable parent)
{
DcSchema schema = parent.Schema;
//DcSchemaKind schemaType = schema.GetSchemaKind();
DcTable table;
Column column;
string colName;
if (parent is DcSchema)
{
colName = "Top";
}
else
{
colName = "Super";
}
if (schemaType == DcSchemaKind.Dc)
{
table = new Table(name, this);
column = new Column(colName, table, parent, true, true);
}
else if (schemaType == DcSchemaKind.Csv)
{
table = new TableCsv(name, this);
column = new ColumnCsv(colName, table, parent, true, true);
}
else if (schemaType == DcSchemaKind.Oledb)
{
table = new TableRel(name, this);
column = new ColumnRel(colName, table, parent, true, true);
}
else if (schemaType == DcSchemaKind.Rel)
{
table = new TableRel(name, this);
column = new ColumnRel(colName, table, parent, true, true);
}
else
{
throw new NotImplementedException("This schema type is not implemented.");
}
_tables.Add(table);
NotifyAdd(table);
_columns.Add(column);
NotifyAdd(column);
return(table);
}
