Add @NotNull to TargetData toJson in Java client

Author: jhh

client/src/main/java/org/strykeforce/deadeye/DeadeyeJsonAdapter.java

@@ -3,6 +3,7 @@
 import okio.BufferedSource;
 
 import java.io.IOException;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * A {@code TargetData} class implements {@code DeadeyeJsonAdapter} to enable
@@ -25,5 +26,5 @@ public interface DeadeyeJsonAdapter<T extends TargetData> {
    * @return this object in JSON format.
    * @throws IOException if a serialization error occurs.
    */
-  String toJson(T targetData) throws IOException;
+  String toJson(@NotNull T targetData) throws IOException;
 }

client/src/main/java/org/strykeforce/deadeye/MinAreaRectTargetData.java

@@ -208,7 +208,7 @@ public MinAreaRectTargetData fromJson(BufferedSource source) throws IOException
     }
 
     @Override
-    public String toJson(MinAreaRectTargetData targetData) throws IOException {
+    public String toJson(@NotNull MinAreaRectTargetData targetData) throws IOException {
       Buffer buffer = new Buffer();
       JsonWriter writer = JsonWriter.of(buffer);
       writer.beginObject();

client/src/main/java/org/strykeforce/deadeye/Rect.java

@@ -30,6 +30,7 @@ public class Rect {
    *
    * @param topLeft     the coordinates of the top left corner
    * @param bottomRight the coordinates of the bottom right corner
+   * @param contourArea the area of the contour contained by this rectangle
    */
   public Rect(@NotNull Point topLeft, @NotNull Point bottomRight, int contourArea) {
     Objects.requireNonNull(topLeft);

client/src/main/java/org/strykeforce/deadeye/TargetData.java

@@ -102,7 +102,7 @@ public TargetData fromJson(BufferedSource source) throws IOException {
     }
 
     @Override
-    public String toJson(TargetData targetData) throws IOException {
+    public String toJson(@NotNull TargetData targetData) throws IOException {
       Buffer buffer = new Buffer();
       JsonWriter writer = JsonWriter.of(buffer);
       writer.beginObject();

client/src/main/java/org/strykeforce/deadeye/TargetListTargetData.java

@@ -193,7 +193,7 @@ public TargetListTargetData fromJson(BufferedSource source) throws IOException {
     }
 
     @Override
-    public String toJson(TargetListTargetData targetData) throws IOException {
+    public String toJson(@NotNull TargetListTargetData targetData) throws IOException {
       Buffer buffer = new Buffer();
       JsonWriter writer = JsonWriter.of(buffer);
       writer.beginObject();

client/src/main/java/org/strykeforce/deadeye/UprightRectTargetData.java

@@ -180,7 +180,7 @@ public UprightRectTargetData fromJson(BufferedSource source) throws IOException
     }
 
     @Override
-    public String toJson(UprightRectTargetData targetData) throws IOException {
+    public String toJson(@NotNull UprightRectTargetData targetData) throws IOException {
       Buffer buffer = new Buffer();
       JsonWriter writer = JsonWriter.of(buffer);
       writer.beginObject();