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, 7 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/NgramContext.java b/java/src/com/android/inputmethod/latin/NgramContext.java
index 2dc409f9f..4a3ac0fae 100644
--- a/java/src/com/android/inputmethod/latin/NgramContext.java
+++ b/java/src/com/android/inputmethod/latin/NgramContext.java
@@ -23,13 +23,17 @@ import com.android.inputmethod.latin.utils.StringUtils;
 
 import java.util.Arrays;
 
+import javax.annotation.Nonnull;
+
 /**
  * Class to represent information of previous words. This class is used to add n-gram entries
  * into binary dictionaries, to get predictions, and to get suggestions.
  */
 public class NgramContext {
+    @Nonnull
     public static final NgramContext EMPTY_PREV_WORDS_INFO =
             new NgramContext(WordInfo.EMPTY_WORD_INFO);
+    @Nonnull
     public static final NgramContext BEGINNING_OF_SENTENCE =
             new NgramContext(WordInfo.BEGINNING_OF_SENTENCE_WORD_INFO);
 
@@ -37,7 +41,9 @@ public class NgramContext {
      * Word information used to represent previous words information.
      */
     public static class WordInfo {
+        @Nonnull
         public static final WordInfo EMPTY_WORD_INFO = new WordInfo(null);
+        @Nonnull
         public static final WordInfo BEGINNING_OF_SENTENCE_WORD_INFO = new WordInfo();
 
         // This is an empty char sequence when mIsBeginningOfSentence is true.
@@ -97,6 +103,7 @@ public class NgramContext {
     }
 
     // Create next prevWordsInfo using current prevWordsInfo.
+    @Nonnull
     public NgramContext getNextNgramContext(final WordInfo wordInfo) {
         final int nextPrevWordCount = Math.min(Constants.MAX_PREV_WORD_COUNT_FOR_N_GRAM,
                 mPrevWordsCount + 1);