Adds validation and dimension extraction functions.
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048b19d4d2
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9107b7c83d
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src/Ringo.hs
67
src/Ringo.hs
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@ -1,4 +1,69 @@
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module Ringo where
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import Ringo.Types
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import Ringo.Tables
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import qualified Data.Map as Map
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import Data.Maybe (mapMaybe, fromMaybe)
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import Data.List (nub)
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import qualified Data.Text as T
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data ValidationError = MissingTable TableName
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| MissingColumn TableName ColumnName
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deriving (Eq, Show)
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indexList :: Ord k => (a -> k) -> [a] -> Map.Map k a
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indexList f = Map.fromList . map (\x -> (f x, x))
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checkTableForCol :: Table -> ColumnName -> [ValidationError]
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checkTableForCol tab colName =
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[MissingColumn (tableName tab) colName |
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not . any ((colName ==) . columnName) . tableColumns $ tab]
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validateTable :: [Table] -> Table -> [ValidationError]
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validateTable tables table = concatMap checkConstraint . tableConstraints $ table
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where
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tableMap = indexList tableName tables
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checkConstraint (PrimaryKey colName) = checkTableForCol table colName
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checkConstraint (UniqueKey columnNames) = checkTableForColRefs table columnNames
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checkConstraint (ForeignKey oTableName columnNames) =
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case Map.lookup oTableName tableMap of
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Just oTable ->
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checkTableForColRefs table (map fst columnNames)
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++ checkTableForColRefs oTable (map snd columnNames)
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Nothing -> [MissingTable oTableName]
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checkTableForColRefs tab = concatMap (checkTableForCol tab)
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validateFact :: [Table] -> Fact -> [ValidationError]
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validateFact tables Fact {..} =
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case Map.lookup factTableName tableMap of
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Nothing -> [MissingTable factTableName]
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Just table -> concatMap (checkColumn table) factColumns
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where
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tableMap = indexList tableName tables
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checkColumn table = checkTableForCol table . factColumnName
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extractDimensions :: T.Text -> Table -> Fact -> [Table]
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extractDimensions prefix Table {..} Fact {..} =
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map (\(dim, cols) -> Table { tableName = T.concat [prefix, dim]
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, tableColumns = Column "id" "serial" NotNullable : cols
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, tableConstraints = [ PrimaryKey "id"
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, UniqueKey (map columnName cols)
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]
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})
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. Map.toList
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. Map.mapWithKey (\dim -> map (cleanColumn dim) . nub)
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. Map.fromListWith (++)
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. mapMaybe (\fcol -> do
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DimVal d col <- fcol
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column <- Map.lookup col columnMap
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return (d, [column]))
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. map Just
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$ factColumns
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where
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columnMap = indexList columnName tableColumns
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cleanColumn dim col@Column {..} =
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col { columnName = fromMaybe columnName . T.stripPrefix (T.snoc dim '_') $ columnName }
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@ -9,43 +9,42 @@ type ColumnName = Text
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type ColumnType = Text
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type TableName = Text
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data Nullable = Nullable | NotNullable deriving (Eq, Enum, Show)
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data Column = Column
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{ columnName :: ColumnName
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, columnType :: ColumnType
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, columnNullable :: Bool
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, columnDefault :: Maybe Text
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{ columnName :: ColumnName
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, columnType :: ColumnType
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, columnNullable :: Nullable
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} deriving (Eq, Show)
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data ColumnRef = ColumnRef ColumnName deriving (Eq, Show)
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data TableContraint = PrimaryKey ColumnRef
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| UniqueKey [ColumnRef]
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| ForeignKey TableRef [(ColumnRef, ColumnRef)]
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data TableContraint = PrimaryKey ColumnName
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| UniqueKey [ColumnName]
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| ForeignKey TableName [(ColumnName, ColumnName)]
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deriving (Eq, Show)
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data Table = Table
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{ tableName :: TableName
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, tableColumns :: [Column]
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{ tableName :: TableName
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, tableColumns :: [Column]
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, tableConstraints :: [TableContraint]
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} deriving (Eq, Show)
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data TableRef = TableRef TableName deriving (Eq, Show)
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data TimeUnit = Second | Minute | Hour | Day | Week | Month | Year
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deriving (Eq, Enum, Show)
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column :: ColumnName -> ColumnType -> Column
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column cname ctype = Column cname ctype True Nothing
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data Fact = Fact
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{ factName :: TableName
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, factTableName :: TableName
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, factColumns :: [FactColumn]
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} deriving (Eq, Show)
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colNotNull :: Column -> Column
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colNotNull c = c { columnNullable = False }
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data FactColumn = DimTime ColumnName
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| NoDimId ColumnName
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| DimId TableName ColumnName
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| DimVal TableName ColumnName
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deriving (Eq, Show)
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colDefault :: Text -> Column -> Column
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colDefault cdefault c = c { columnDefault = Just cdefault }
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primaryKey :: ColumnName -> TableContraint
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primaryKey = PrimaryKey . ColumnRef
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uniqueKey :: [ColumnName] -> TableContraint
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uniqueKey = UniqueKey . map ColumnRef
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foreignKey :: TableName -> [(ColumnName, ColumnName)] -> TableContraint
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foreignKey tableName =
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ForeignKey (TableRef tableName) . map (\(c1, c2) -> (ColumnRef c1, ColumnRef c2))
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factColumnName :: FactColumn -> ColumnName
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factColumnName (DimTime cName) = cName
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factColumnName (NoDimId cName) = cName
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factColumnName (DimId _ cName) = cName
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factColumnName (DimVal _ cName) = cName
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