select.RenderSelect.scala Maven / Gradle / Ivy
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/*
* Copyright 2021 Kári Magnússon
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kuzminki.select
import kuzminki.api.KuzminkiError
import kuzminki.fn.Agg.AggFn
import kuzminki.run.RunQuery
import kuzminki.shape.RowShapeSingle
import kuzminki.section._
import kuzminki.render._
class RenderSelect[M, R](
model: M,
coll: SelectCollector[R]
) extends SelectCacheMethods(model, coll)
with RunQuery[R] {
def render = RenderedQuery(
coll.render,
coll.args,
coll.rowShape.conv
)
def cache = new StoredQuery(
coll.render,
coll.args,
coll.rowShape.conv
)
// subquery
def asSubquery = new Subquery(coll)
def asColumn = {
coll.rowShape match {
case shape: RowShapeSingle[_] =>
new SubqueryCol(coll, shape.col.conv)
case _ =>
throw KuzminkiError("Subquery is invalid")
}
}
private def firstColumn = {
coll.sections(0) match {
case SelectSec(parts) =>
parts(0)
case _ =>
throw KuzminkiError("Subquery is invalid")
}
}
def asAggregation = {
firstColumn match {
case col: AggFn =>
case _ =>
throw KuzminkiError("Subquery column must be an aggregation function")
}
new AggregationSubquery(coll)
}
}