[java] Add nullness for interactions v2 (SeleniumHQ#15106)

Co-authored-by: Viet Nguyen Duc <[email protected]>

Author: mk868

java/src/org/openqa/selenium/interactions/Actions.java

@@ -30,6 +30,8 @@
 import java.util.Objects;
 import java.util.Set;
 import java.util.function.IntConsumer;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.WebDriver;
 import org.openqa.selenium.WebElement;
 import org.openqa.selenium.interactions.PointerInput.Origin;
@@ -44,16 +46,17 @@
  *
  * <p>Call {@link #perform()} at the end of the method chain to actually perform the actions.
  */
+@NullMarked
 public class Actions {
 
   private final WebDriver driver;
 
   // W3C
   private final Map<InputSource, Sequence> sequences = new HashMap<>();
 
-  private PointerInput activePointer;
-  private KeyInput activeKeyboard;
-  private WheelInput activeWheel;
+  private @Nullable PointerInput activePointer;
+  private @Nullable KeyInput activeKeyboard;
+  private @Nullable WheelInput activeWheel;
   private Duration actionDuration;
 
   public Actions(WebDriver driver) {
@@ -537,21 +540,21 @@ public KeyInput getActiveKeyboard() {
     if (this.activeKeyboard == null) {
       setActiveKeyboard("default keyboard");
     }
-    return this.activeKeyboard;
+    return Require.nonNull("ActiveKeyboard", this.activeKeyboard);
   }
 
   public PointerInput getActivePointer() {
     if (this.activePointer == null) {
       setActivePointer(PointerInput.Kind.MOUSE, "default mouse");
     }
-    return this.activePointer;
+    return Require.nonNull("ActivePointer", this.activePointer);
   }
 
   public WheelInput getActiveWheel() {
     if (this.activeWheel == null) {
       setActiveWheel("default wheel");
     }
-    return this.activeWheel;
+    return Require.nonNull("ActiveWheel", this.activeWheel);
   }
 
   public Duration getActionDuration() {

java/src/org/openqa/selenium/interactions/Pause.java

@@ -22,8 +22,10 @@
 import java.time.Duration;
 import java.util.HashMap;
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
 
 /** Indicates that a given {@link InputSource} should pause for a given duration. */
+@NullMarked
 public class Pause extends Interaction implements Encodable {
 
   private final Duration duration;

java/src/org/openqa/selenium/interactions/Sequence.java

@@ -22,6 +22,7 @@
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import org.jspecify.annotations.NullMarked;
 
 /**
  * A sequence of action objects for a given {@link InputSource} for use with the W3C <a
@@ -30,6 +31,7 @@
  * Interaction}s, with the first item in each sequence being executed at the same time, then the
  * second, and so on, until all interactions in all sequences have been executed.
  */
+@NullMarked
 public class Sequence implements Encodable {
 
   private final List<Encodable> actions = new LinkedList<>();

java/src/org/openqa/selenium/interactions/WheelInput.java

@@ -24,6 +24,8 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.Point;
 import org.openqa.selenium.WebElement;
 import org.openqa.selenium.WrapsElement;
@@ -33,11 +35,12 @@
  * Models a <a href="https://www.w3.org/TR/webdriver/#dfn-wheel-input-source">wheel input
  * source</a>.
  */
+@NullMarked
 public class WheelInput implements InputSource, Encodable {
 
   private final String name;
 
-  public WheelInput(String name) {
+  public WheelInput(@Nullable String name) {
     this.name = Optional.ofNullable(name).orElse(UUID.randomUUID().toString());
   }