Add JSR305 annotation to LeakGuardHandlerWrapper

Change-Id: I7456200af739db4510c5549b7bc894fb48749455

java/src/com/android/inputmethod/keyboard/TextDecorator.java

@@ -303,7 +303,7 @@ public class TextDecorator {
      */
     private static final class LayoutInvalidator {
         private final HandlerImpl mHandler;
-        public LayoutInvalidator(final TextDecorator ownerInstance) {
+        public LayoutInvalidator(@Nonnull final TextDecorator ownerInstance) {
             mHandler = new HandlerImpl(ownerInstance);
         }
 
@@ -311,7 +311,7 @@ public class TextDecorator {
 
         private static final class HandlerImpl
                 extends LeakGuardHandlerWrapper<TextDecorator> {
-            public HandlerImpl(final TextDecorator ownerInstance) {
+            public HandlerImpl(@Nonnull final TextDecorator ownerInstance) {
                 super(ownerInstance);
             }
 

java/src/com/android/inputmethod/keyboard/internal/DrawingHandler.java

@@ -23,6 +23,8 @@ import com.android.inputmethod.keyboard.internal.DrawingHandler.Callbacks;
 import com.android.inputmethod.latin.SuggestedWords;
 import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
 
+import javax.annotation.Nonnull;
+
 // TODO: Separate this class into KeyPreviewHandler and BatchInputPreviewHandler or so.
 public class DrawingHandler extends LeakGuardHandlerWrapper<Callbacks> {
     public interface Callbacks {
@@ -34,7 +36,7 @@ public class DrawingHandler extends LeakGuardHandlerWrapper<Callbacks> {
     private static final int MSG_DISMISS_KEY_PREVIEW = 0;
     private static final int MSG_DISMISS_GESTURE_FLOATING_PREVIEW_TEXT = 1;
 
-    public DrawingHandler(final Callbacks ownerInstance) {
+    public DrawingHandler(@Nonnull final Callbacks ownerInstance) {
         super(ownerInstance);
     }
 

java/src/com/android/inputmethod/keyboard/internal/TimerHandler.java

@@ -27,6 +27,8 @@ import com.android.inputmethod.keyboard.internal.TimerHandler.Callbacks;
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.utils.LeakGuardHandlerWrapper;
 
+import javax.annotation.Nonnull;
+
 // TODO: Separate this class into KeyTimerHandler and BatchInputTimerHandler or so.
 public final class TimerHandler extends LeakGuardHandlerWrapper<Callbacks> implements TimerProxy {
     public interface Callbacks {
@@ -45,7 +47,7 @@ public final class TimerHandler extends LeakGuardHandlerWrapper<Callbacks> imple
     private final int mIgnoreAltCodeKeyTimeout;
     private final int mGestureRecognitionUpdateTime;
 
-    public TimerHandler(final Callbacks ownerInstance, final int ignoreAltCodeKeyTimeout,
+    public TimerHandler(@Nonnull final Callbacks ownerInstance, final int ignoreAltCodeKeyTimeout,
             final int gestureRecognitionUpdateTime) {
         super(ownerInstance);
         mIgnoreAltCodeKeyTimeout = ignoreAltCodeKeyTimeout;

java/src/com/android/inputmethod/latin/LatinIME.java

@@ -110,6 +110,8 @@ import java.util.List;
 import java.util.Locale;
 import java.util.concurrent.TimeUnit;
 
+import javax.annotation.Nonnull;
+
 /**
  * Input method implementation for Qwerty'ish keyboard.
  */
@@ -208,7 +210,7 @@ public class LatinIME extends InputMethodService implements KeyboardActionListen
         private int mDelayInMillisecondsToUpdateSuggestions;
         private int mDelayInMillisecondsToUpdateShiftState;
 
-        public UIHandler(final LatinIME ownerInstance) {
+        public UIHandler(@Nonnull final LatinIME ownerInstance) {
             super(ownerInstance);
         }
 

java/src/com/android/inputmethod/latin/setup/SetupWizardActivity.java

@@ -42,6 +42,8 @@ import com.android.inputmethod.latin.utils.UncachedInputMethodManagerUtils;
 
 import java.util.ArrayList;
 
+import javax.annotation.Nonnull;
+
 // TODO: Use Fragment to implement welcome screen and setup steps.
 public final class SetupWizardActivity extends Activity implements View.OnClickListener {
     static final String TAG = SetupWizardActivity.class.getSimpleName();
@@ -82,7 +84,7 @@ public final class SetupWizardActivity extends Activity implements View.OnClickL
 
         private final InputMethodManager mImmInHandler;
 
-        public SettingsPoolingHandler(final SetupWizardActivity ownerInstance,
+        public SettingsPoolingHandler(@Nonnull final SetupWizardActivity ownerInstance,
                 final InputMethodManager imm) {
             super(ownerInstance);
             mImmInHandler = imm;

java/src/com/android/inputmethod/latin/utils/LeakGuardHandlerWrapper.java

@@ -21,21 +21,22 @@ import android.os.Looper;
 
 import java.lang.ref.WeakReference;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 public class LeakGuardHandlerWrapper<T> extends Handler {
     private final WeakReference<T> mOwnerInstanceRef;
 
-    public LeakGuardHandlerWrapper(final T ownerInstance) {
+    public LeakGuardHandlerWrapper(@Nonnull final T ownerInstance) {
         this(ownerInstance, Looper.myLooper());
     }
 
-    public LeakGuardHandlerWrapper(final T ownerInstance, final Looper looper) {
+    public LeakGuardHandlerWrapper(@Nonnull final T ownerInstance, final Looper looper) {
         super(looper);
-        if (ownerInstance == null) {
-            throw new NullPointerException("ownerInstance is null");
-        }
         mOwnerInstanceRef = new WeakReference<>(ownerInstance);
     }
 
+    @Nullable
     public T getOwnerInstance() {
         return mOwnerInstanceRef.get();
     }