Use confidence to fix whitelist

With this the most obvious problem is fixed. However there
are two remaining items : we should still enforce whitelist
when there are no close candidates at all, and we should
start in confident mode when pressing the globe key.

Bug: 18063142
Bug: 18130489
Bug: 18132240
Bug: 18136721
Bug: 18200415
Change-Id: Ibc0571ae35fc28f8d13760aa86b25db1163d3e31

1 files changed, 13 insertions, 1 deletions

diff --git a/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java b/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
index 2ee4068b6..f2d7a8c3c 100644
--- a/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
+++ b/java/src/com/android/inputmethod/latin/DictionaryFacilitator.java
@@ -63,6 +63,9 @@ public class DictionaryFacilitator {
     // HACK: This threshold is being used when adding a capitalized entry in the User History
     // dictionary.
     private static final int CAPITALIZED_FORM_MAX_PROBABILITY_FOR_INSERT = 140;
+    // How many words we need to type in a row ({@see mConfidenceInMostProbableLanguage}) to
+    // declare we are confident the user is typing in the most probable language.
+    private static final int CONFIDENCE_THRESHOLD = 3;
 
     private DictionaryGroup[] mDictionaryGroups = new DictionaryGroup[] { new DictionaryGroup() };
     private DictionaryGroup mMostProbableDictionaryGroup = mDictionaryGroups[0];
@@ -293,6 +296,14 @@ public class DictionaryFacilitator {
         }
     }
 
+    public boolean isConfidentAboutCurrentLanguageBeing(final Locale mLocale) {
+        final DictionaryGroup mostProbableDictionaryGroup = mMostProbableDictionaryGroup;
+        if (!mostProbableDictionaryGroup.mLocale.equals(mLocale)) {
+            return false;
+        }
+        return mostProbableDictionaryGroup.mConfidence >= CONFIDENCE_THRESHOLD;
+    }
+
     @Nullable
     private static ExpandableBinaryDictionary getSubDict(final String dictType,
             final Context context, final Locale locale, final File dictFile,
@@ -634,7 +645,8 @@ public class DictionaryFacilitator {
             final int timeStampInSeconds, final boolean blockPotentiallyOffensive) {
         final ExpandableBinaryDictionary userHistoryDictionary =
                 dictionaryGroup.getSubDict(Dictionary.TYPE_USER_HISTORY);
-        if (userHistoryDictionary == null) {
+        if (userHistoryDictionary == null
+                || !isConfidentAboutCurrentLanguageBeing(userHistoryDictionary.mLocale)) {
             return;
         }
         final int maxFreq = getFrequency(word);