Add contextual dictionary to the dictionary facilitator.

Bug: 14161647
Change-Id: I0e706b2abd0cb9f351e28681e275cd7f2fdbfd9c

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

@@ -57,6 +57,8 @@ public abstract class Dictionary {
     public static final String TYPE_USER_HISTORY = "history";
     // Personalization dictionary.
     public static final String TYPE_PERSONALIZATION = "personalization";
+    // Contextual dictionary.
+    public static final String TYPE_CONTEXTUAL = "contextual";
     public final String mDictType;
 
     public Dictionary(final String dictType) {

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

@@ -23,6 +23,7 @@ import android.util.Log;
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.personalization.ContextualDictionary;
 import com.android.inputmethod.latin.personalization.PersonalizationDictionary;
 import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
 import com.android.inputmethod.latin.utils.CollectionUtils;
@@ -63,7 +64,8 @@ public class DictionaryFacilitatorForSuggest {
                 Dictionary.TYPE_USER_HISTORY,
                 Dictionary.TYPE_PERSONALIZATION,
                 Dictionary.TYPE_USER,
-                Dictionary.TYPE_CONTACTS
+                Dictionary.TYPE_CONTACTS,
+                Dictionary.TYPE_CONTEXTUAL
             };
 
     private static final Map<String, Class<? extends ExpandableBinaryDictionary>>
@@ -74,6 +76,7 @@ public class DictionaryFacilitatorForSuggest {
         DICT_TYPE_TO_CLASS.put(Dictionary.TYPE_PERSONALIZATION, PersonalizationDictionary.class);
         DICT_TYPE_TO_CLASS.put(Dictionary.TYPE_USER, UserBinaryDictionary.class);
         DICT_TYPE_TO_CLASS.put(Dictionary.TYPE_CONTACTS, ContactsBinaryDictionary.class);
+        DICT_TYPE_TO_CLASS.put(Dictionary.TYPE_CONTEXTUAL, ContextualDictionary.class);
     }
 
     private static final String DICT_FACTORY_METHOD_NAME = "getDictionary";
@@ -201,6 +204,7 @@ public class DictionaryFacilitatorForSuggest {
         if (usePersonalizedDicts) {
             subDictTypesToUse.add(Dictionary.TYPE_USER_HISTORY);
             subDictTypesToUse.add(Dictionary.TYPE_PERSONALIZATION);
+            subDictTypesToUse.add(Dictionary.TYPE_CONTEXTUAL);
         }
 
         final Dictionary newMainDict;

java/src/com/android/inputmethod/latin/personalization/ContextualDictionary.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2014 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.personalization;
+
+import android.content.Context;
+
+import com.android.inputmethod.annotations.UsedForTesting;
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+
+import java.io.File;
+import java.util.Locale;
+
+public class ContextualDictionary extends ExpandableBinaryDictionary {
+    /* package */ static final String NAME = PersonalizationDictionary.class.getSimpleName();
+
+    private ContextualDictionary(final Context context, final Locale locale,
+            final File dictFile) {
+        super(context, getDictName(NAME, locale, dictFile), locale, Dictionary.TYPE_CONTEXTUAL,
+                dictFile);
+        // Always reset the contents.
+        clear();
+    }
+    @UsedForTesting
+    public static ContextualDictionary getDictionary(final Context context, final Locale locale,
+            final File dictFile) {
+        return new ContextualDictionary(context, locale, dictFile);
+    }
+
+    @Override
+    public boolean isValidWord(final String word) {
+        // Strings out of this dictionary should not be considered existing words.
+        return false;
+    }
+
+    @Override
+    protected void loadInitialContentsLocked() {
+    }
+
+    @Override
+    protected boolean haveContentsChanged() {
+        return false;
+    }
+}