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calasql-query_3.0.1.8.source-code.FlatJoin.scala Maven / Gradle / Ivy
package scalasql.query
import scalasql.core.{Context, JoinNullable, Queryable, Expr}
object FlatJoin {
trait Rhs[Q2, R2]
class MapResult[Q, Q2, R, R2](
val prefix: String,
val from: Context.From,
val on: Option[Expr[Boolean]],
val qr: Queryable.Row[Q2, R2],
val f: Q2,
val where: Seq[Expr[Boolean]]
) extends Rhs[Q2, R2]
class FlatMapResult[Q, Q2, R, R2](
val prefix: String,
val from: Context.From,
val on: Option[Expr[Boolean]],
val qr: Queryable.Row[Q2, R2],
val f: Rhs[Q2, R2],
val where: Seq[Expr[Boolean]]
) extends Rhs[Q2, R2]
class Mapper[Q, Q2, R, R2](
prefix: String,
from: Context.From,
expr: Q,
on: Option[Expr[Boolean]],
where: Seq[Expr[Boolean]]
) {
def map(f: Q => Q2)(implicit qr: Queryable.Row[Q2, R2]): MapResult[Q, Q2, R, R2] = {
new MapResult[Q, Q2, R, R2](prefix, from, on, qr, f(expr), where)
}
def flatMap(
f: Q => Rhs[Q2, R2]
)(implicit qr: Queryable.Row[Q2, R2]): FlatMapResult[Q, Q2, R, R2] = {
new FlatMapResult[Q, Q2, R, R2](prefix, from, on, qr, f(expr), where)
}
def filter(x: Q => Expr[Boolean]): Mapper[Q, Q2, R, R2] = withFilter(x)
def withFilter(x: Q => Expr[Boolean]): Mapper[Q, Q2, R, R2] =
new Mapper(prefix, from, expr, on, where ++ Seq(x(expr)))
}
class NullableMapper[Q, Q2, R, R2](
prefix: String,
from: Context.From,
expr: JoinNullable[Q],
on: Option[Expr[Boolean]],
where: Seq[Expr[Boolean]]
) {
def lateral = new NullableMapper[Q, Q2, R, R2](prefix + " LATERAL", from, expr, on, where)
def map(
f: JoinNullable[Q] => Q2
)(implicit qr: Queryable.Row[Q2, R2]): MapResult[Q, Q2, R, R2] = {
new MapResult[Q, Q2, R, R2](prefix, from, on, qr, f(expr), where)
}
def flatMap(
f: JoinNullable[Q] => Rhs[Q2, R2]
)(implicit qr: Queryable.Row[Q2, R2]): FlatMapResult[Q, Q2, R, R2] = {
new FlatMapResult[Q, Q2, R, R2](prefix, from, on, qr, f(expr), where)
}
def filter(x: JoinNullable[Q] => Expr[Boolean]): NullableMapper[Q, Q2, R, R2] = withFilter(x)
def withFilter(x: JoinNullable[Q] => Expr[Boolean]): NullableMapper[Q, Q2, R, R2] =
new NullableMapper("LEFT JOIN", from, expr, on, where ++ Seq(x(expr)))
}
}
