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CHAPTER 7 TRAITS AND TYPES AND GNARLY STUFF FOR ARCHITECTS
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The next bunch of code is a long slog. We have to define subclasses of Tuples with two to four places that include extra type information that we used in Table. We mix FieldProduct into each of the Tuples so that they contain extra information about the types as well as column information. You may ask, Why not use a List or some such Each element in the List has the same type, where each element in a Tuple has its own information, and because we re tying the types together in Table to ensure that the columns we define have the correct type, we need to know the type of each column.
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trait SuperTuple {
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Now we define the FieldProduct trait. It s sealed so that we know that other implementation or subclasses will not sneak into our code.
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sealed trait FieldProduct[TableType <: Table[TableType]] { def fields: List[BasicColumn[TableType, _]] def fieldProduct: Product def buildResult(rs: ResultSet): ReturnType type ReturnType <: Product }
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Next we define MyTuple2, which extends Scala s Tuple2 (a two-element Tuple) with FieldProduct, and we define the fieldProduct method as a Tuple2 of the columns in the table. Harking back to 3, Lists and Tuples are different. Lists contain a variable number of elements, all of the same type. Tuples contain a fixed number of elements, each of which may be a different type. The rest of the code is boilerplate.
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abstract class MyTuple2[TableType <: Table[TableType], A1, A2](a1: A1, a2: A2) extends Tuple2[A1, A2](a1, a2) with FieldProduct[TableType] { def fieldProduct: (BasicColumn[TableType, A1], BasicColumn[TableType, A2]) type ReturnType = (A1, A2) def buildResult(rs: ResultSet): ReturnType = (fieldProduct._1.getField(rs), fieldProduct._2.getField(rs))
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CHAPTER 7 TRAITS AND TYPES AND GNARLY STUFF FOR ARCHITECTS
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def ~[OT](p: BasicColumn[TableType, OT]): MyTuple3[TableType, A1, A2, OT] ={ val f = fields val fp = fieldProduct new MyTuple3[TableType, A1, A2, OT](this._1, this._2, p.default) { val fields = f ::: List(p) val fieldProduct = (fp._1, fp._2, p) } } } abstract class MyTuple3[TableType <: Table[TableType], A1, A2, A3] (a1: A1, a2: A2, a3: A3) extends Tuple3[A1, A2, A3](a1, a2, a3) with FieldProduct[TableType] { def buildResult(rs: ResultSet): ReturnType = (fieldProduct._1.getField(rs), fieldProduct._2.getField(rs), fieldProduct._3.getField(rs)) type ReturnType = (A1, A2, A3) def fieldProduct: (BasicColumn[TableType, A1], BasicColumn[TableType, A2], BasicColumn[TableType, A3]) def ~[OT](p: BasicColumn[TableType, OT]): MyTuple4[TableType, A1, A2, A3, OT] = { val f = fields val fp = fieldProduct new MyTuple4[TableType, A1, A2, A3, OT]( this._1, this._2, this._3, p.default) { val fields = f ::: List(p) val fieldProduct = (fp._1, fp._2, fp._3, p) } } } abstract class MyTuple4[TableType <: Table[TableType], A1, A2, A3, A4] (a1: A1, a2: A2, a3: A3, a4: A4) extends
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CHAPTER 7 TRAITS AND TYPES AND GNARLY STUFF FOR ARCHITECTS
Tuple4[A1, A2, A3, A4](a1, a2, a3, a4) with def fieldProduct: (BasicColumn[TableType, BasicColumn[TableType, BasicColumn[TableType, BasicColumn[TableType, type ReturnType = (A1, A2, A3, A4)
FieldProduct[TableType] { A1], A2], A3], A4])
def buildResult(rs: ResultSet): ReturnType = (fieldProduct._1.getField(rs), fieldProduct._2.getField(rs), fieldProduct._3.getField(rs), fieldProduct._4.getField(rs)) } }
Vending JDBC Connections
Are we there yet Almost. We re finished the hard slogging. Next, we define a trait that vends JDBC connections:
trait ConnectionSupplier { protected def getJDBCConnection: Connection = null // do something better }
Making a Concrete Class That Implements Table
We define a class that extends Table with ConnectionSupplier. This is our library consumer code that we will write to consume the Library trait. For all the heavy slogging and boilerplate in SuperTuple, we get something very nice and pleasant, something that s simple and understandable.
class val val val val MyTable extends Table[MyTable] with ConnectionSupplier { table = "mytable" id = IntColumn("id") name = StringColumn("name") birthday = DateColumn("birthday")
type ColumnTypes = (Int, String, Date) def columns = id ~ name ~ birthday } object MyTable extends MyTable
CHAPTER 7 TRAITS AND TYPES AND GNARLY STUFF FOR ARCHITECTS
We define the MyTable class and then the MyTable object. We need to do this because the type of the object MyTable is not known until the object is fully declared. There is an exception to this requirement when defining classes.10 So we have to go through two steps to define our MyTable object.
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