Add VERSION4_TEST for testing.

Bug: 13406708
Change-Id: I0b434717ea3edbb131650af634c53cfbfe113c3e

3 files changed, 11 insertions, 3 deletions

diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 83ee982b1..7ab90880c 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -541,7 +541,9 @@ public final class BinaryDictionary extends Dictionary {
         close();
         final File dictFile = new File(mDictFilePath);
         final File tmpDictFile = new File(tmpDictFilePath);
-        FileUtils.deleteRecursively(dictFile);
+        if (!FileUtils.deleteRecursively(dictFile)) {
+            return false;
+        }
         if (!BinaryDictionaryUtils.renameDict(tmpDictFile, dictFile)) {
             return false;
         }
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index e3bed318e..2aa9ca31c 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -119,8 +119,9 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
     }
 
     private boolean needsToMigrateDictionary(final int formatVersion) {
-        // TODO: Check version.
-        return false;
+        // When we bump up the dictionary format version, the old version should be added to here
+        // for supporting migration. Note that native code has to support reading such formats.
+        return formatVersion == FormatSpec.VERSION4_ONLY_FOR_TESTING;
     }
 
     public boolean isValidDictionaryLocked() {
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index f25503488..613ff2ba4 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -186,7 +186,12 @@ public final class FormatSpec {
     // From version 4 on, we use version * 100 + revision as a version number. That allows
     // us to change the format during development while having testing devices remove
     // older files with each upgrade, while still having a readable versioning scheme.
+    // When we bump up the dictionary format version, we should update
+    // ExpandableDictionary.needsToMigrateDictionary() and
+    // ExpandableDictionary.matchesExpectedBinaryDictFormatVersionForThisType().
     public static final int VERSION2 = 2;
+    // Dictionary version used for testing.
+    public static final int VERSION4_ONLY_FOR_TESTING = 399;
     public static final int VERSION4 = 401;
     static final int MINIMUM_SUPPORTED_VERSION = VERSION2;
     static final int MAXIMUM_SUPPORTED_VERSION = VERSION4;