Simplify message handling by returning early and throwing out maps

src/main/java/org/whispersystems/textsecuregcm/entities/MessageResponse.java

@@ -16,16 +16,25 @@
  */
 package org.whispersystems.textsecuregcm.entities;
 
+import java.util.HashSet;
+import java.util.LinkedList;
 import java.util.List;
+import java.util.Set;
 
 public class MessageResponse {
   private List<String> success;
   private List<String> failure;
-  private List<String> missingDeviceIds;
+  private Set<String>  missingDeviceIds;
 
-  public MessageResponse(List<String> success, List<String> failure, List<String> missingDeviceIds) {
+  public MessageResponse(List<String> success, List<String> failure) {
     this.success          = success;
     this.failure          = failure;
+    this.missingDeviceIds = new HashSet<>();
+  }
+
+  public MessageResponse(Set<String> missingDeviceIds) {
+    this.success          = new LinkedList<>();
+    this.failure          = new LinkedList<>(missingDeviceIds);
     this.missingDeviceIds = missingDeviceIds;
   }
 
@@ -35,11 +44,23 @@ public class MessageResponse {
     return success;
   }
 
+  public void setSuccess(List<String> success) {
+    this.success = success;
+  }
+
   public List<String> getFailure() {
     return failure;
   }
 
-  public List<String> getNumbersMissingDevices() {
+  public void setFailure(List<String> failure) {
+    this.failure = failure;
+  }
+
+  public Set<String> getNumbersMissingDevices() {
     return missingDeviceIds;
   }
+
+  public void setNumbersMissingDevices(Set<String> numbersMissingDevices) {
+    this.missingDeviceIds = numbersMissingDevices;
+  }
 }