Kotlin Not able to recognise Deferred/Promise/Future values in a map which has Values as String or D-CodePudding

val varToValue = mapOf("@id" to arg.userId, "@salary" to arg.salary)


            for (variable in varToValue.keys) {
                fieldData = fieldData.replace(Regex(variable),if(varToValue[variable] is String)  varToValue[variable] else varToValue[variable]?.await() ?: "") //here
            }

Here fieldData is a string which might contain @id or @salary. arg.id is of type String and arg.salary is of type Deferred<String>. Now the line where I call the replace function is not able to identify the await() call. It is giving me the suggestion of Rename reference. Basically I think it is not able to identify that it is of Deferred type. How do i solve this problem. I can make a different map for Deferred and normal type but I was hoping I could solve in one for loop and just one map.

CodePudding user response：

Can simply typecast the varToValue[variable] when it is not a String.

fieldData = fieldData.replace(Regex(variable),if(varToValue[variable] is String)  varToValue[variable] else (varToValue[variable] as Deferred<String>)?.await())

This seems to solve the problem for me.

CodePudding user response：

The problem is that Kotlin is a strongly typed language and a Deferred<String> and String are two different types. The easiest way to solve this problem would be to change them both to be Deferred, for example, wrap arg.id into a CompletableDeferred:

val varToValue = mapOf("@id" to CompletableDeferred(arg.userId), "@salary" to arg.salary)