1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef OHOS_IDL_STRINGPOOL_H
17 #define OHOS_IDL_STRINGPOOL_H
18 
19 #include <unordered_map>
20 #include "util/string.h"
21 
22 namespace OHOS {
23 namespace Idl {
24 class StringPool {
25 public:
26     StringPool();
27 
28     ~StringPool();
29 
30     void Add(const String& string);
31 
32     ptrdiff_t GetOffset(const String& string);
33 
GetSize()34     size_t GetSize()
35     {
36         return dataOffset_;
37     }
38 
GetData()39     char* GetData()
40     {
41         return data_;
42     }
43 
44 private:
45     ptrdiff_t AddInternal(const String& string);
46 
47     bool Grow(size_t expand);
48 
49     static const char* TAG;
50     char* data_ = nullptr;
51     size_t dataCapacity_ = 256;
52     ptrdiff_t dataOffset_ = 0;
53     std::unordered_map<String, ptrdiff_t, StringHashFunc, StringEqualFunc> stringOffsets_;
54 };
55 }
56 }
57 #endif // OHOS_IDL_STRINGPOOL_H
58