Fix a bug on upgrading user history scheme

Bug: 6626700
Change-Id: I3190d7404e45e704be79ee2031e79b18475feb8c

1 files changed, 6 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/latin/UserHistoryForgettingCurveUtils.java b/java/src/com/android/inputmethod/latin/UserHistoryForgettingCurveUtils.java
index 9cd8c6778..e5516dc62 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryForgettingCurveUtils.java
+++ b/java/src/com/android/inputmethod/latin/UserHistoryForgettingCurveUtils.java
@@ -30,6 +30,7 @@ public class UserHistoryForgettingCurveUtils {
     private static final long ELAPSED_TIME_INTERVAL_MILLIS = ELAPSED_TIME_INTERVAL_HOURS
             * DateUtils.HOUR_IN_MILLIS;
     private static final int HALF_LIFE_HOURS = 48;
+    private static final int MAX_PUSH_ELAPSED = (FC_LEVEL_MAX + 1) * (ELAPSED_TIME_MAX + 1);
 
     private UserHistoryForgettingCurveUtils() {
         // This utility class is not publicly instantiable.
@@ -94,6 +95,11 @@ public class UserHistoryForgettingCurveUtils {
             if (elapsedTimeCount <= 0) {
                 return;
             }
+            if (elapsedTimeCount >= MAX_PUSH_ELAPSED) {
+                mLastTouchedTime = now;
+                mFc = 0;
+                return;
+            }
             for (int i = 0; i < elapsedTimeCount; ++i) {
                 mLastTouchedTime += ELAPSED_TIME_INTERVAL_MILLIS;
                 mFc = pushElapsedTime(mFc);