[hal] Update runtime enum to allow selecting roborio 2 (#3565)

In some cases, knowing roborio 2 might be useful. This also creates a higher level enum that might be usable later for the discussion on more complex runtime types.

wpilibj/src/main/java/edu/wpi/first/wpilibj/RobotBase.java

@@ -160,6 +160,15 @@ public abstract class RobotBase implements AutoCloseable {
   @Override
   public void close() {}
 
+  /**
+   * Get the current runtime type.
+   *
+   * @return Current runtime type.
+   */
+  public static RuntimeType getRuntimeType() {
+    return RuntimeType.getValue(HALUtil.getHALRuntimeType());
+  }
+
   /**
    * Get if the robot is a simulation.
    *
@@ -175,7 +184,8 @@ public abstract class RobotBase implements AutoCloseable {
    * @return If the robot is running in the real world.
    */
   public static boolean isReal() {
-    return HALUtil.getHALRuntimeType() == 0;
+    RuntimeType runtimeType = getRuntimeType();
+    return runtimeType == RuntimeType.kRoboRIO || runtimeType == RuntimeType.kRoboRIO2;
   }
 
   /**

wpilibj/src/main/java/edu/wpi/first/wpilibj/RuntimeType.java

@@ -0,0 +1,34 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+package edu.wpi.first.wpilibj;
+
+import edu.wpi.first.hal.HALUtil;
+
+public enum RuntimeType {
+  kRoboRIO(HALUtil.RUNTIME_ROBORIO),
+  kRoboRIO2(HALUtil.RUNTIME_ROBORIO2),
+  kSimulation(HALUtil.RUNTIME_SIMULATION);
+
+  public final int value;
+
+  RuntimeType(int value) {
+    this.value = value;
+  }
+
+  /**
+   * Construct a runtime type from an int value.
+   *
+   * @param type Runtime type as int
+   * @return Matching runtime type
+   */
+  public static RuntimeType getValue(int type) {
+    if (type == HALUtil.RUNTIME_ROBORIO) {
+      return RuntimeType.kRoboRIO;
+    } else if (type == HALUtil.RUNTIME_ROBORIO2) {
+      return RuntimeType.kRoboRIO2;
+    }
+    return RuntimeType.kSimulation;
+  }
+}