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diff --git a/PinyinIME/jni/include/dictbuilder.h b/PinyinIME/jni/include/dictbuilder.h
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+/*
+ * Copyright (C) 2009 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.
+ */
+
+#ifndef PINYINIME_INCLUDE_DICTBUILDER_H__
+#define PINYINIME_INCLUDE_DICTBUILDER_H__
+
+#include <stdlib.h>
+#include "./utf16char.h"
+#include "./dictdef.h"
+#include "./dictlist.h"
+#include "./spellingtable.h"
+#include "./spellingtrie.h"
+#include "./splparser.h"
+
+namespace ime_pinyin {
+
+#ifdef ___BUILD_MODEL___
+
+#define ___DO_STATISTICS___
+
+class DictTrie;
+
+class DictBuilder {
+ private:
+  // The raw lemma array buffer.
+  LemmaEntry *lemma_arr_;
+  size_t lemma_num_;
+
+  // Used to store all possible single char items.
+  // Two items may have the same Hanzi while their spelling ids are different.
+  SingleCharItem *scis_;
+  size_t scis_num_;
+
+  // In the tree, root's level is -1.
+  // Lemma nodes for root, and level 0
+  LmaNodeLE0 *lma_nodes_le0_;
+
+  // Lemma nodes for layers whose levels are deeper than 0
+  LmaNodeGE1 *lma_nodes_ge1_;
+
+  // Number of used lemma nodes
+  size_t lma_nds_used_num_le0_;
+  size_t lma_nds_used_num_ge1_;
+
+  // Used to store homophonies' ids.
+  LemmaIdType *homo_idx_buf_;
+  // Number of homophonies each of which only contains one Chinese character.
+  size_t homo_idx_num_eq1_;
+  // Number of homophonies each of which contains more than one character.
+  size_t homo_idx_num_gt1_;
+
+  // The items with highest scores.
+  LemmaEntry *top_lmas_;
+  size_t top_lmas_num_;
+
+  SpellingTable *spl_table_;
+  SpellingParser *spl_parser_;
+
+#ifdef ___DO_STATISTICS___
+  size_t max_sonbuf_len_[kMaxLemmaSize];
+  size_t max_homobuf_len_[kMaxLemmaSize];
+
+  size_t total_son_num_[kMaxLemmaSize];
+  size_t total_node_hasson_[kMaxLemmaSize];
+  size_t total_sonbuf_num_[kMaxLemmaSize];
+  size_t total_sonbuf_allnoson_[kMaxLemmaSize];
+  size_t total_node_in_sonbuf_allnoson_[kMaxLemmaSize];
+  size_t total_homo_num_[kMaxLemmaSize];
+
+  size_t sonbufs_num1_;     // Number of son buffer with only 1 son
+  size_t sonbufs_numgt1_;   // Number of son buffer with more 1 son;
+
+  size_t total_lma_node_num_;
+
+  void stat_init();
+  void stat_print();
+#endif
+
+ public:
+
+  DictBuilder();
+  ~DictBuilder();
+
+  // Build dictionary trie from the file fn_raw. File fn_validhzs provides
+  // valid chars. If fn_validhzs is NULL, only chars in GB2312 will be
+  // included.
+  bool build_dict(const char* fn_raw, const char* fn_validhzs,
+                  DictTrie *dict_trie);
+
+ private:
+  // Fill in the buffer with id. The caller guarantees that the paramters are
+  // vaild.
+  void id_to_charbuf(unsigned char *buf, LemmaIdType id);
+
+  // Update the offset of sons for a node.
+  void set_son_offset(LmaNodeGE1 *node, size_t offset);
+
+  // Update the offset of homophonies' ids for a node.
+  void set_homo_id_buf_offset(LmaNodeGE1 *node, size_t offset);
+
+  // Format a speling string.
+  void format_spelling_str(char *spl_str);
+
+  // Sort the lemma_arr by the hanzi string, and give each of unique items
+  // a id. Why we need to sort the lemma list according to their Hanzi string
+  // is to find items started by a given prefix string to do prediction.
+  // Actually, the single char items are be in other order, for example,
+  // in spelling id order, etc.
+  // Return value is next un-allocated idx available.
+  LemmaIdType sort_lemmas_by_hz();
+
+  // Build the SingleCharItem list, and fill the hanzi_scis_ids in the
+  // lemma buffer lemma_arr_.
+  // This function should be called after the lemma array is ready.
+  // Return the number of unique SingleCharItem elements.
+  size_t build_scis();
+
+  // Construct a subtree using a subset of the spelling array (from
+  // item_star to item_end)
+  // parent is the parent node to update the necessary information
+  // parent can be a member of LmaNodeLE0 or LmaNodeGE1
+  bool construct_subset(void* parent, LemmaEntry* lemma_arr,
+                        size_t item_start, size_t item_end, size_t level);
+
+
+  // Read valid Chinese Hanzis from the given file.
+  // num is used to return number of chars.
+  // The return buffer is sorted and caller needs to free the returned buffer.
+  char16* read_valid_hanzis(const char *fn_validhzs, size_t *num);
+
+
+  // Read a raw dictionary. max_item is the maximum number of items. If there
+  // are more items in the ditionary, only the first max_item will be read.
+  // Returned value is the number of items successfully read from the file.
+  size_t read_raw_dict(const char* fn_raw, const char *fn_validhzs,
+                       size_t max_item);
+
+  // Try to find if a character is in hzs buffer.
+  bool hz_in_hanzis_list(const char16 *hzs, size_t hzs_len, char16 hz);
+
+  // Try to find if all characters in str are in hzs buffer.
+  bool str_in_hanzis_list(const char16 *hzs, size_t hzs_len,
+                          const char16 *str, size_t str_len);
+
+  // Get these lemmas with toppest scores.
+  void get_top_lemmas();
+
+  // Allocate resource to build dictionary.
+  // lma_num is the number of items to be loaded
+  bool alloc_resource(size_t lma_num);
+
+  // Free resource.
+  void free_resource();
+};
+#endif  // ___BUILD_MODEL___
+}
+
+#endif  // PINYINIME_INCLUDE_DICTBUILDER_H__