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diff --git a/PinyinIME/jni/include/lpicache.h b/PinyinIME/jni/include/lpicache.h
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+++ b/PinyinIME/jni/include/lpicache.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_ANDPY_INCLUDE_LPICACHE_H__
+#define PINYINIME_ANDPY_INCLUDE_LPICACHE_H__
+
+#include <stdlib.h>
+#include "./searchutility.h"
+#include "./spellingtrie.h"
+
+namespace ime_pinyin {
+
+// Used to cache LmaPsbItem list for half spelling ids.
+class LpiCache {
+ private:
+  static LpiCache *instance_;
+  static const int kMaxLpiCachePerId = 15;
+
+  LmaPsbItem *lpi_cache_;
+  uint16 *lpi_cache_len_;
+
+ public:
+  LpiCache();
+  ~LpiCache();
+
+  static LpiCache& get_instance();
+
+  // Test if the LPI list of the given splid  has been cached.
+  // If splid is a full spelling id, it returns false, because we only cache
+  // list for half ids.
+  bool is_cached(uint16 splid);
+
+  // Put LPI list to cahce. If the length of the list, lpi_num, is longer than
+  // the cache buffer. the list will be truncated, and function returns the
+  // maximum length of the cache buffer.
+  // Note: splid must be a half id, and lpi_items must be not NULL. The
+  // caller of this function should guarantee this.
+  size_t put_cache(uint16 splid, LmaPsbItem lpi_items[], size_t lpi_num);
+
+  // Get the cached list for the given half id.
+  // Return the length of the cached buffer.
+  // Note: splid must be a half id, and lpi_items must be not NULL. The
+  // caller of this function should guarantee this.
+  size_t get_cache(uint16 splid, LmaPsbItem lpi_items[], size_t lpi_max);
+};
+
+}  // namespace
+
+#endif  // PINYINIME_ANDPY_INCLUDE_LPICACHE_H__