Fix Javadoc and null analysis related warnings

This CL also adds @SuppressWarning("unused" to java-overridable package.

Bug: 18003991
Change-Id: If70527e30654384705d7a814f5efd181d9f539e1

1 files changed, 6 insertions, 3 deletions

diff --git a/java/src/com/android/inputmethod/latin/utils/NgramContextUtils.java b/java/src/com/android/inputmethod/latin/utils/NgramContextUtils.java
index 95a1f0fb2..ba436777d 100644
--- a/java/src/com/android/inputmethod/latin/utils/NgramContextUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/NgramContextUtils.java
@@ -16,14 +16,16 @@
 
 package com.android.inputmethod.latin.utils;
 
-import java.util.Arrays;
-import java.util.regex.Pattern;
-
 import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.NgramContext;
 import com.android.inputmethod.latin.NgramContext.WordInfo;
 import com.android.inputmethod.latin.settings.SpacingAndPunctuations;
 
+import java.util.Arrays;
+import java.util.regex.Pattern;
+
+import javax.annotation.Nonnull;
+
 public final class NgramContextUtils {
     private NgramContextUtils() {
         // Intentional empty constructor for utility class.
@@ -52,6 +54,7 @@ public final class NgramContextUtils {
     // (n = 2) "abc|" -> beginning-of-sentence
     // (n = 2) "abc |" -> beginning-of-sentence
     // (n = 2) "abc. def|" -> beginning-of-sentence
+    @Nonnull
     public static NgramContext getNgramContextFromNthPreviousWord(final CharSequence prev,
             final SpacingAndPunctuations spacingAndPunctuations, final int n) {
         if (prev == null) return NgramContext.EMPTY_PREV_WORDS_INFO;