[RF4] Actually remove ver4 dicts

And fix a couple bugs.

Bug: 11281748
Change-Id: If07953a4b1ff9eb1165af03fdb332d7e47cd8f32

java/src/com/android/inputmethod/latin/AssetFileAddress.java

@@ -16,6 +16,8 @@
 
 package com.android.inputmethod.latin;
 
+import com.android.inputmethod.latin.utils.FileUtils;
+
 import java.io.File;
 
 /**
@@ -58,6 +60,6 @@ public final class AssetFileAddress {
     }
 
     public void deleteUnderlyingFile() {
-        new File(mFilename).delete();
+        FileUtils.deleteRecursively(new File(mFilename));
     }
 }

java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java

@@ -27,6 +27,7 @@ import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.utils.AsyncResultHolder;
 import com.android.inputmethod.latin.utils.CollectionUtils;
+import com.android.inputmethod.latin.utils.FileUtils;
 import com.android.inputmethod.latin.utils.PrioritizedSerialExecutor;
 
 import java.io.File;
@@ -568,7 +569,9 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
                     || !matchesExpectedBinaryDictFormatVersionForThisType(
                             mBinaryDictionary.getFormatVersion())) {
                 final File file = new File(mContext.getFilesDir(), mFilename);
-                file.delete();
+                if (!FileUtils.deleteRecursively(file)) {
+                    Log.e(TAG, "Can't remove a file: " + file.getName());
+                }
                 BinaryDictionary.createEmptyDictFile(file.getAbsolutePath(),
                         DICTIONARY_FORMAT_VERSION, getHeaderAttributeMap());
             } else {
@@ -664,17 +667,26 @@ abstract public class ExpandableBinaryDictionary extends Dictionary {
                         // load the shared dictionary.
                         loadBinaryDictionary();
                     }
+                    // If we just loaded the binary dictionary, then mBinaryDictionary is not
+                    // up-to-date yet so it's useless to test it right away. Schedule the check
+                    // for right after it's loaded instead.
+                    getExecutor(mFilename).executePrioritized(new Runnable() {
+                        @Override
+                        public void run() {
                             if (mBinaryDictionary != null && !(isValidDictionary()
                                     // TODO: remove the check below
                                     && matchesExpectedBinaryDictFormatVersionForThisType(
                                             mBinaryDictionary.getFormatVersion()))) {
-                        // Binary dictionary or its format version is not valid. Regenerate the
+                                // Binary dictionary or its format version is not valid. Regenerate
-                        // dictionary file.
+                                // the dictionary file. writeBinaryDictionary will remove the
+                                // existing files if appropriate.
                                 mFilenameDictionaryUpdateController.mLastUpdateTime = time;
                                 writeBinaryDictionary();
                                 loadBinaryDictionary();
                             }
                             mPerInstanceDictionaryUpdateController.mLastUpdateTime = time;
+                        }
+                    });
                 } finally {
                     mFilenameDictionaryUpdateController.mProcessingLargeTask.set(false);
                 }

java/src/com/android/inputmethod/latin/utils/FileUtils.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import java.io.File;
+
+/**
+ * A simple class to help with removing directories recursively.
+ */
+public class FileUtils {
+    public static boolean deleteRecursively(final File path) {
+        if (path.isDirectory()) {
+            for (final File child : path.listFiles()) {
+                deleteRecursively(child);
+            }
+        }
+        return path.delete();
+    }
+}

native/jni/src/suggest/policyimpl/dictionary/header/header_read_write_utils.cpp

@@ -116,10 +116,10 @@ const char *const HeaderReadWriteUtils::REQUIRES_FRENCH_LIGATURE_PROCESSING_KEY
             // Version 2 dictionary writing is not supported.
             return false;
         case FormatUtils::VERSION_3:
-            return buffer->writeUintAndAdvancePosition(3 /* data */,
+            return buffer->writeUintAndAdvancePosition(FormatUtils::VERSION_3 /* data */,
                     HEADER_DICTIONARY_VERSION_SIZE, writingPos);
         case FormatUtils::VERSION_4:
-            return buffer->writeUintAndAdvancePosition(4 /* data */,
+            return buffer->writeUintAndAdvancePosition(FormatUtils::VERSION_4 /* data */,
                     HEADER_DICTIONARY_VERSION_SIZE, writingPos);
         default:
             return false;