// throws NullReferenceException
/// <summary>
/// parses <see cref="TableSchema"/> from <paramref name="tableSchemaXmlNode"/>.
/// </summary>
/// <param name="tableSchemaXmlNode"></param>
/// <returns>
/// <see cref="TableSchema"/> parsed from <paramref name="tableSchemaXmlNode"/>
/// </returns>
/// <exception cref="TableSchemaParseException">
/// thrown if <see cref="TableSchema"/> parse failed
/// </exception>
public static TableSchema Parse(XmlNode tableSchemaXmlNode)
{
try
{
// get required name attribute
string tableName = tableSchemaXmlNode.GetAttributeValue("name");
// get optional notAuditable element
bool auditable = !tableSchemaXmlNode.ContainsNodes("not_auditable");
// get table columns
XmlNodeList columnSchemaXmlNodeList = tableSchemaXmlNode.GetNodes("column");
ColumnSchema[] columnSchemas = new ColumnSchema[columnSchemaXmlNodeList.Count];
for (int i = 0; i < columnSchemaXmlNodeList.Count; i++)
{
XmlNode columnSchemaXmlNode = columnSchemaXmlNodeList[i];
columnSchemas[i] = ColumnSchema.Parse(columnSchemaXmlNode);
}
// get primary key, if specified
ColumnSchema primaryKeyColumnSchema = null;
if (tableSchemaXmlNode.ContainsNodes("primary_key")) // primary key specified
{
int primaryKeyColumnIndex =
tableSchemaXmlNode.GetNodes("primary_key")[0]
.GetAttributeValue <int>("column_index");
primaryKeyColumnSchema = columnSchemas[primaryKeyColumnIndex];
}
TableSchema tableSchema = new TableSchema(
tableName,
columnSchemas,
primaryKeyColumnSchema,
auditable);
return(tableSchema);
}
catch (Exception exception)
{
if ( // exception while trying to parse TableSchema
exception is XmlNodeMissingAttributeException ||
exception is XmlNodeMissingNodeException ||
exception is InvalidAttributeTypeException ||
exception is ColumnSchemaParseExcetion)
{
throw new TableSchemaParseException(null, exception);
}
else // unhandled exception
{
throw exception;
}
}
}
