Merge pull request apache#111 from aryaman-das/153290093-adas

Worked on rdar://153290093 (Introduce Java 11 compatible "spark-operator-api" library)

Author: jiangzho

build.gradle

@@ -54,9 +54,16 @@ subprojects {
   apply plugin: 'eclipse'
   apply plugin: 'java'
 
-  java {
-    sourceCompatibility = 17
-    targetCompatibility = 17
+  if (project.name.equals("spark-operator-api")) {
+    java {
+      sourceCompatibility = 11
+      targetCompatibility = 11
+    }
+  } else {
+    java {
+      sourceCompatibility = 17
+      targetCompatibility = 17
+    }
   }
 
   repositories {

spark-operator-api/src/main/java/org/apache/spark/k8s/operator/spec/RestartPolicy.java

@@ -29,11 +29,16 @@ public enum RestartPolicy {
 
   public static boolean attemptRestartOnState(
       final RestartPolicy policy, final BaseStateSummary stateSummary) {
-    return switch (policy) {
-      case Always -> true;
-      case Never -> false;
-      case OnFailure -> stateSummary.isFailure();
-      case OnInfrastructureFailure -> stateSummary.isInfrastructureFailure();
-    };
+    switch (policy) {
+      case Always:
+        return true;
+      case Never:
+        return false;
+      case OnFailure:
+        return stateSummary.isFailure();
+      case OnInfrastructureFailure:
+        return stateSummary.isInfrastructureFailure();
+    }
+    return false;
   }
 }