CODEWITHSUNDEEP
scala
ustcyue
ustcyue

Reputation: 651

Is it possible to convert between two case class with different name and slightly different field in scala

for example, I have case classes

case class foo(timestamp:String, epochSecond: Long)

and 

case class bar(epochSecond: Long, timestamp:String)

Is it possible to make conversion between the instance of these two classes?

Upvotes: 0

Views: 45

Answers (1)

jwvh
jwvh

Reputation: 51271

Your question is rather vague because there are so many ways to accomplish this. Here's one option.

With the definition of the case classes ...

case class Foo(timestamp:String, epochSecond: Long)
case class Bar(epochSecond: Long, timestamp:String)

... add auxiliary factory methods.

object Foo {
  def apply(b: Bar): Foo = this(b.timestamp, b.epochSecond)
}
object Bar {
  def apply(f: Foo): Bar = this(f.epochSecond, f.timestamp)
}

Now you can transition from one type to the other very simply.

val fooX = Foo("noon", 42L)
val barY = Bar(99L, "none")

val fooY = Foo(barY)  //fooY: Foo = Foo(none,99)
val barX = Bar(fooX)  //barX: Bar = Bar(42,noon)

Upvotes: 1

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