3 files changed, 40 insertions, 5 deletions

diff --git a/src/include/novel_types.h b/src/include/novel_types.h
index e2d2363..52fc0b0 100644
--- a/src/include/novel_types.h
+++ b/src/include/novel_types.h
@@ -86,7 +86,8 @@ enum ErrorResult{
     ERROR_OUT_OF_RANGE,          /* beyond the end of the sub phrase index */
     ERROR_FILE_CORRUPTION,       /* file is corrupted */
     ERROR_INTEGER_OVERFLOW,      /* integer is overflowed */
-    ERROR_ALREADY_EXISTS         /* the sub phrase already exists. */
+    ERROR_ALREADY_EXISTS,        /* the sub phrase already exists. */
+    ERROR_NO_USER_TABLE          /* the user table is not loaded. */
 };
 
 /* For N-gram */
diff --git a/src/storage/facade_chewing_table.h b/src/storage/facade_chewing_table.h
index 50683eb..572ce04 100644
--- a/src/storage/facade_chewing_table.h
+++ b/src/storage/facade_chewing_table.h
@@ -174,7 +174,7 @@ public:
     int add_index(int phrase_length, /* in */ ChewingKey keys[],
                   /* in */ phrase_token_t token) {
         if (NULL == m_user_chewing_table)
-            return false;
+            return ERROR_NO_USER_TABLE;
         return m_user_chewing_table->add_index(phrase_length, keys, token);
     }
 
@@ -191,9 +191,24 @@ public:
     int remove_index(int phrase_length, /* in */ ChewingKey keys[],
                      /* in */ phrase_token_t token) {
         if (NULL == m_user_chewing_table)
-            return false;
+            return ERROR_NO_USER_TABLE;
         return m_user_chewing_table->remove_index(phrase_length, keys, token);
     }
+
+    /**
+     * FacadeChewingTable::mask_out:
+     * @mask: the mask.
+     * @value: the value.
+     * @returns: whether the mask out operation is successful.
+     *
+     * Mask out the matched chewing index.
+     *
+     */
+    bool mask_out(phrase_token_t mask, phrase_token_t value) {
+        if (NULL == m_user_chewing_table)
+            return false;
+        return m_user_chewing_table->mask_out(mask, value);
+    }
 };
 
 };
diff --git a/src/storage/facade_phrase_table2.h b/src/storage/facade_phrase_table2.h
index b9bc9ca..4167ada 100644
--- a/src/storage/facade_phrase_table2.h
+++ b/src/storage/facade_phrase_table2.h
@@ -154,7 +154,8 @@ public:
     int add_index(int phrase_length, /* in */ ucs4_t phrase[],
                   /* in */ phrase_token_t token) {
         if (NULL == m_user_phrase_table)
-            return false;
+            return ERROR_NO_USER_TABLE;
+
         return m_user_phrase_table->add_index
             (phrase_length, phrase, token);
     }
@@ -172,10 +173,28 @@ public:
     int remove_index(int phrase_length, /* in */ ucs4_t phrase[],
                      /* in */ phrase_token_t token) {
         if (NULL == m_user_phrase_table)
-            return false;
+            return ERROR_NO_USER_TABLE;
+
         return m_user_phrase_table->remove_index
             (phrase_length, phrase, token);
     }
+
+    /**
+     * FacadePhraseTable2::mask_out:
+     * @mask: the mask.
+     * @value: the value.
+     * @returns: whether the mask out operation is successful.
+     *
+     * Mask out the matched phrase index.
+     *
+     */
+    bool mask_out(phrase_token_t mask, phrase_token_t value) {
+        if (NULL == m_user_phrase_table)
+            return false;
+
+        return m_user_phrase_table->mask_out
+            (mask, value);
+    }
 };
 
 };