YARN-3005. [JDK7] Use switch statement for String instead of if-else statement in RegistrySecurity.java (Contributed by Kengo Seki)

(cherry picked from commit 533e551eb42af188535aeb0ab35f8ebf150a0da1)

hadoop-yarn-project/CHANGES.txt

@@ -46,6 +46,9 @@ Release 2.7.0 - UNRELEASED
 
   IMPROVEMENTS
 
+    YARN-3005. [JDK7] Use switch statement for String instead of if-else
+    statement in RegistrySecurity.java (Kengo Seki via aajisaka)
+
     YARN-2950. Change message to mandate, not suggest JS requirement on UI.
     (Dustin Cote via harsh)
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-registry/src/main/java/org/apache/hadoop/registry/client/impl/zk/RegistrySecurity.java

@@ -192,14 +192,17 @@ public class RegistrySecurity extends AbstractService {
     String auth = conf.getTrimmed(KEY_REGISTRY_CLIENT_AUTH,
         REGISTRY_CLIENT_AUTH_ANONYMOUS);
 
-    // TODO JDK7 SWITCH
-    if (REGISTRY_CLIENT_AUTH_KERBEROS.equals(auth)) {
+    switch (auth) {
+    case REGISTRY_CLIENT_AUTH_KERBEROS:
       access = AccessPolicy.sasl;
-    } else if (REGISTRY_CLIENT_AUTH_DIGEST.equals(auth)) {
+      break;
+    case REGISTRY_CLIENT_AUTH_DIGEST:
       access = AccessPolicy.digest;
-    } else if (REGISTRY_CLIENT_AUTH_ANONYMOUS.equals(auth)) {
+      break;
+    case REGISTRY_CLIENT_AUTH_ANONYMOUS:
       access = AccessPolicy.anon;
-    } else {
+      break;
+    default:
       throw new ServiceStateException(E_UNKNOWN_AUTHENTICATION_MECHANISM
                                       + "\"" + auth + "\"");
     }