Solve comments

core/src/main/java/edu/wpi/grip/core/operations/network/NetworkReceiver.java

@@ -3,6 +3,7 @@
 import java.util.function.Consumer;
 
 import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
 
 /**
  * Manages the interface between the {@link PublishAnnotatedOperation} and the actual network
@@ -18,7 +19,8 @@ public abstract class NetworkReceiver implements AutoCloseable {
    * @param path The path of the object to get
    */
   public NetworkReceiver(String path) {
-    checkArgument(!path.isEmpty(), "Name cannot be an empty string");
+    checkNotNull(path, "Path cannot be null");
+    checkArgument(!path.isEmpty(), "Path cannot be an empty string");
     this.path = path;
   }
 

core/src/main/java/edu/wpi/grip/core/operations/network/networktables/NTManager.java

@@ -178,9 +178,9 @@ public void close() {
       NetworkTablesJNI.removeEntryListener(entryListenerFunctionUid);
 
       synchronized (NetworkTable.class) {
-        // This publisher is no longer used.
+        // This receiver is no longer used.
         if (NTManager.count.addAndGet(-1) == 0) {
-          // We are the last publisher so shut it down
+          // We are the last resource using NetworkTables so shut it down
           NetworkTable.shutdown();
         }
       }
@@ -247,7 +247,7 @@ public void close() {
       synchronized (NetworkTable.class) {
         // This publisher is no longer used.
         if (NTManager.count.addAndGet(-1) == 0) {
-          // We are the last publisher so shut it down
+          // We are the last resource using NetworkTables so shut it down
           NetworkTable.shutdown();
         }
       }

core/src/main/java/edu/wpi/grip/core/sources/NetworkTableEntrySource.java

@@ -10,6 +10,7 @@
 import edu.wpi.grip.core.sockets.SocketHints;
 import edu.wpi.grip.core.util.ExceptionWitness;
 
+import com.google.common.base.CaseFormat;
 import com.google.common.collect.ImmutableList;
 import com.google.common.eventbus.EventBus;
 import com.google.common.eventbus.Subscribe;
@@ -24,12 +25,13 @@
 /**
  * Provides a way to get a {@link Types Type} from a NetworkTable that GRIP is connected to.
  */
-@XStreamAlias("grip:NetworkValue")
+@XStreamAlias("grip:NetworkTableValue")
 public class NetworkTableEntrySource extends Source {
 
   private static final String PATH_PROPERTY = "networktable_path";
   private static final String TYPE_PROPERTY = "BOOLEAN";
 
+  private final EventBus eventBus;
   private final OutputSocket output;
   private final String path;
   private final Types type;
@@ -46,7 +48,7 @@ public enum Types {
 
     @Override
     public String toString() {
-      return super.toString().charAt(0) + super.toString().substring(1).toLowerCase();
+      return CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, name());
     }
 
   }
@@ -75,12 +77,11 @@ public String toString() {
       @Assisted String path,
       @Assisted Types type) {
     super(exceptionWitnessFactory);
+    this.eventBus = eventBus;
     this.path = path;
     this.type = type;
     networkReceiver = networkReceiverFactory.create(path);
     output = osf.create(createOutputSocket(type));
-
-    networkReceiver.addListener(o -> eventBus.post(new SourceHasPendingUpdateEvent(this)));
   }
 
   @Override
@@ -117,7 +118,7 @@ public Properties getProperties() {
 
   @Override
   public void initialize() {
-    updateOutputSockets();
+    networkReceiver.addListener(o -> eventBus.post(new SourceHasPendingUpdateEvent(this)));
   }
 
   @Subscribe
@@ -141,7 +142,7 @@ private static SocketHint createOutputSocket(Types type) {
       case STRING:
         return SocketHints.Outputs.createStringSocketHint(Types.STRING.toString(), "");
       default:
-        throw new IllegalArgumentException("Invalid NetworkTable source type");
+        throw new IllegalArgumentException(type + " is an invalid NetworkTable source type");
     }
   }
 }