-
Notifications
You must be signed in to change notification settings - Fork 6
/
MultiWriter.scala
42 lines (38 loc) · 1.62 KB
/
MultiWriter.scala
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/*
* Copyright (c) 2021 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fabric.rw
import fabric.Json
class MultiWriter[T](val writers: List[Writer[T]], merge: (T, T) => T)
extends Writer[T] {
override def write(value: Json): T = writers.tail
.foldLeft(writers.head.write(value))((t, writer) =>
merge(t, writer.write(value))
)
}
object MultiWriter {
def apply[T](writers: Writer[T]*)(implicit merge: (T, T) => T): Writer[T] = {
val list = writers.toList.flatMap {
case mw: MultiWriter[T] => mw.writers
case w => List(w)
}
new MultiWriter[T](list, merge)
}
}