Fixed bug for handling optional header parameters (#3776)

* Fixed #3774
Refactored code to handle optional header parameters.

* Changed null check with pattern matching

samples/client/petstore/async-scala/src/main/scala/io/swagger/client/api/PetApi.scala

@@ -19,8 +19,6 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling PetApi->addPet")
 
-
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -38,8 +36,10 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
-
-    headerParams += "api_key" -> apiKey.toString
+    apiKey match {
+    case Some(param) => headerParams += "api_key" -> param.toString
+    case _ => headerParams
+    }
 
     val resFuture = client.submit("DELETE", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
@@ -56,10 +56,7 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val headerParams = new mutable.HashMap[String, String]
 
     if (status == null) throw new Exception("Missing required parameter 'status' when calling PetApi->findPetsByStatus")
-
-    if (status != null) queryParams += "status" -> status.toString
-
-
+    queryParams += "status" -> status.toString
 
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
@@ -76,10 +73,7 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val headerParams = new mutable.HashMap[String, String]
 
     if (tags == null) throw new Exception("Missing required parameter 'tags' when calling PetApi->findPetsByTags")
-
-    if (tags != null) queryParams += "tags" -> tags.toString
-
-
+    queryParams += "tags" -> tags.toString
 
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
@@ -97,7 +91,6 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -114,8 +107,6 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling PetApi->updatePet")
 
-
-
     val resFuture = client.submit("PUT", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -135,7 +126,6 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -155,7 +145,6 @@ class PetApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(c
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))

samples/client/petstore/async-scala/src/main/scala/io/swagger/client/api/StoreApi.scala

@@ -16,6 +16,7 @@ class StoreApi(client: TransportClient, config: SwaggerConfig) extends ApiClient
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
+    if (orderId == null) throw new Exception("Missing required parameter 'orderId' when calling StoreApi->deleteOrder")
 
 
     val resFuture = client.submit("DELETE", path, queryParams.toMap, headerParams.toMap, "")
@@ -33,7 +34,6 @@ class StoreApi(client: TransportClient, config: SwaggerConfig) extends ApiClient
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -50,7 +50,6 @@ class StoreApi(client: TransportClient, config: SwaggerConfig) extends ApiClient
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -67,8 +66,6 @@ class StoreApi(client: TransportClient, config: SwaggerConfig) extends ApiClient
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling StoreApi->placeOrder")
 
-
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))

samples/client/petstore/async-scala/src/main/scala/io/swagger/client/api/UserApi.scala

@@ -17,8 +17,6 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling UserApi->createUser")
 
-
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -35,8 +33,6 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling UserApi->createUsersWithArrayInput")
 
-
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -53,8 +49,6 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
 
     if (body == null) throw new Exception("Missing required parameter 'body' when calling UserApi->createUsersWithListInput")
 
-
-
     val resFuture = client.submit("POST", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -70,6 +64,7 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
+    if (username == null) throw new Exception("Missing required parameter 'username' when calling UserApi->deleteUser")
 
 
     val resFuture = client.submit("DELETE", path, queryParams.toMap, headerParams.toMap, "")
@@ -87,6 +82,7 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
+    if (username == null) throw new Exception("Missing required parameter 'username' when calling UserApi->getUserByName")
 
 
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
@@ -104,11 +100,12 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
-    if (username != null) queryParams += "username" -> username.toString
-
-    if (password != null) queryParams += "password" -> password.toString
+    if (username == null) throw new Exception("Missing required parameter 'username' when calling UserApi->loginUser")
 
+    if (password == null) throw new Exception("Missing required parameter 'password' when calling UserApi->loginUser")
 
+    queryParams += "username" -> username.toString
+    queryParams += "password" -> password.toString
 
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
@@ -125,7 +122,6 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
     val headerParams = new mutable.HashMap[String, String]
 
 
-
     val resFuture = client.submit("GET", path, queryParams.toMap, headerParams.toMap, "")
     resFuture flatMap { resp =>
       process(reader.read(resp))
@@ -142,10 +138,10 @@ class UserApi(client: TransportClient, config: SwaggerConfig) extends ApiClient(
     val queryParams = new mutable.HashMap[String, String]
     val headerParams = new mutable.HashMap[String, String]
 
+    if (username == null) throw new Exception("Missing required parameter 'username' when calling UserApi->updateUser")
+
     if (body == null) throw new Exception("Missing required parameter 'body' when calling UserApi->updateUser")
 
-
-
     val resFuture = client.submit("PUT", path, queryParams.toMap, headerParams.toMap, writer.write(body))
     resFuture flatMap { resp =>
       process(reader.read(resp))

samples/client/petstore/async-scala/src/test/scala/Test.scala

@@ -1,18 +1,17 @@
-import io.swagger.client._
-import io.swagger.client.api._
-import io.swagger.client.model._
-
 import java.net.URI
 
+import com.wordnik.swagger.client.ClientResponseReaders.Json4sFormatsReader._
+import com.wordnik.swagger.client.RequestWriters.Json4sFormatsWriter._
+import com.wordnik.swagger.client.SwaggerConfig
+import io.swagger.client.SwaggerClient
+import org.junit.runner.RunWith
+import org.scalatest._
+import org.scalatest.junit.JUnitRunner
+
+import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent._
 import scala.concurrent.duration._
 import scala.util.{Failure, Success}
-import org.scalatest._
-import org.junit.runner.RunWith
-import org.scalatest.junit.JUnitRunner
-import org.scalatest.FunSuite
-import com.wordnik.swagger._
-com.wordnik.swagger.client
 
 @RunWith(classOf[JUnitRunner])
 class SimpleTest extends FlatSpec with Matchers {