private ExtractWriter <T> InitializeWriter(Extract extract)
{
var schema = new ExtractTableSchema <T>();
Table table;
if (extract.hasTable(Name))
{
table = OpenExistingTable(extract, schema);
}
else
{
table = BuildNewTable(extract, schema);
}
return(new ExtractWriter <T>(table, schema));
}
private Table OpenExistingTable(Extract extract, ExtractTableSchema <T> schema)
{
Table table = extract.openTable(Name);
TableDefinition tableDefinition = table.getTableDefinition();
try
{
if (!schema.IsCompatibleWith(tableDefinition))
{
throw new ExtractTableLoadException(String.Format("Existing extract table is incompatible with model '{0}'", Name));
}
return(table);
}
finally
{
tableDefinition.close();
}
}
private Table BuildNewTable(Extract extract, ExtractTableSchema <T> schema)
{
var tableDefinition = new TableDefinition();
try
{
tableDefinition.setDefaultCollation(Collation.EN_US);
foreach (var column in schema.MappedColumns.Select(item => item.Column))
{
tableDefinition.addColumn(column.Name, column.ExtractType);
}
return(extract.addTable(Name, tableDefinition));
}
finally
{
tableDefinition.close();
}
}
