insert.Reuse.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.insert
import kuzminki.api.KuzminkiError
import kuzminki.column.TypeCol
object Reuse {
def noChange: Reuse = NoChange
def fromIndex(insertCols: Vector[TypeCol[_]], reuseCols: Vector[TypeCol[_]]): Reuse = {
val indexes = reuseCols.map { col =>
insertCols.indexOf(col) match {
case -1 =>
throw KuzminkiError(
"column [%s] is not among inserted columns".format("col")
)
case index: Int => index
}
}
new ReuseIndexes(indexes)
}
}
trait Reuse {
val indexes: Vector[Int]
def extend(values: Vector[Any]): Vector[Any]
}
class ReuseIndexes(val indexes: Vector[Int]) extends Reuse {
def extend(values: Vector[Any]): Vector[Any] = {
values ++ indexes.map(values)
}
}
object NoChange extends Reuse {
val indexes = Vector.empty[Int]
def extend(values: Vector[Any]) = values
}