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cpl_json.h
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1 /******************************************************************************
2  * Project: Common Portability Library
3  * Purpose: Function wrapper for libjson-c access.
4  * Author: Dmitry Baryshnikov, dmitry.baryshnikov@nextgis.com
5  *
6  ******************************************************************************
7  * Copyright (c) 2017-2018 NextGIS, <info@nextgis.com>
8  *
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13  * and/or sell copies of the Software, and to permit persons to whom the
14  * Software is furnished to do so, subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice shall be included
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18  *
19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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26  ****************************************************************************/
27 
28 #ifndef CPL_JSON_H_INCLUDED
29 #define CPL_JSON_H_INCLUDED
30 
31 #include "cpl_progress.h"
32 
33 #include <string>
34 #include <vector>
35 
43 typedef void *JSONObjectH;
44 
46 
47 class CPLJSONArray;
53 class CPL_DLL CPLJSONObject
54 {
55  friend class CPLJSONArray;
56  friend class CPLJSONDocument;
57 public:
61  enum Type {
62  Unknown,
63  Null,
64  Object,
65  Array,
66  Boolean,
67  String,
68  Integer,
69  Long,
70  Double
71  };
72 
76  enum PrettyFormat {
79  Pretty
80  };
81 
82 public:
84  CPLJSONObject();
85  explicit CPLJSONObject(const std::string &osName, const CPLJSONObject &oParent);
86  ~CPLJSONObject();
87  CPLJSONObject(const CPLJSONObject &other);
88  CPLJSONObject &operator=(const CPLJSONObject &other);
89  CPLJSONObject &operator=(CPLJSONObject &&other);
90 
91 private:
92  explicit CPLJSONObject(const std::string &osName, JSONObjectH poJsonObject);
95 public:
96  // setters
97  void Add(const std::string &osName, const std::string &osValue);
98  void Add(const std::string &osName, const char *pszValue);
99  void Add(const std::string &osName, double dfValue);
100  void Add(const std::string &osName, int nValue);
101  void Add(const std::string &osName, GInt64 nValue);
102  void Add(const std::string &osName, const CPLJSONArray &oValue);
103  void Add(const std::string &osName, const CPLJSONObject &oValue);
104  void Add(const std::string &osName, bool bValue);
105  void AddNull(const std::string &osName);
106 
107  void Set(const std::string &osName, const std::string &osValue);
108  void Set(const std::string &osName, const char *pszValue);
109  void Set(const std::string &osName, double dfValue);
110  void Set(const std::string &osName, int nValue);
111  void Set(const std::string &osName, GInt64 nValue);
112  void Set(const std::string &osName, bool bValue);
113  void SetNull(const std::string &osName);
114 
116  JSONObjectH GetInternalHandle() const { return m_poJsonObject; }
119  // getters
120  std::string GetString(const std::string &osName, const std::string &osDefault = "") const;
121  double GetDouble(const std::string &osName, double dfDefault = 0.0) const;
122  int GetInteger(const std::string &osName, int nDefault = 0) const;
123  GInt64 GetLong(const std::string &osName, GInt64 nDefault = 0) const;
124  bool GetBool(const std::string &osName, bool bDefault = false) const;
125  std::string ToString(const std::string &osDefault = "") const;
126  double ToDouble(double dfDefault = 0.0) const;
127  int ToInteger(int nDefault = 0) const;
128  GInt64 ToLong(GInt64 nDefault = 0) const;
129  bool ToBool(bool bDefault = false) const;
130  CPLJSONArray ToArray() const;
131  std::string Format(enum PrettyFormat eFormat) const;
132 
133  //
134  void Delete(const std::string &osName);
135  CPLJSONArray GetArray(const std::string &osName) const;
136  CPLJSONObject GetObj(const std::string &osName) const;
137  CPLJSONObject operator[](const std::string &osName) const;
138  enum Type GetType() const;
140  std::string GetName() const { return m_osKey; }
143  std::vector<CPLJSONObject> GetChildren() const;
144  bool IsValid() const;
145  void Deinit();
146 
147 protected:
149  CPLJSONObject GetObjectByPath(const std::string &osPath, std::string &osName) const;
152 private:
153  JSONObjectH m_poJsonObject = nullptr;
154  std::string m_osKey{};
155 };
156 
160 class CPL_DLL CPLJSONArray : public CPLJSONObject
161 {
162  friend class CPLJSONObject;
163  friend class CPLJSONDocument;
164 public:
166  CPLJSONArray();
167  explicit CPLJSONArray(const std::string &osName);
168  explicit CPLJSONArray(const CPLJSONObject &other);
169 
170 private:
171  explicit CPLJSONArray(const std::string &osName, JSONObjectH poJsonObject);
173 public:
174  int Size() const;
175  void Add(const CPLJSONObject &oValue);
176  void Add(const std::string &osValue);
177  void Add(const char* pszValue);
178  void Add(double dfValue);
179  void Add(int nValue);
180  void Add(GInt64 nValue);
181  void Add(bool bValue);
182  CPLJSONObject operator[](int nIndex);
183  const CPLJSONObject operator[](int nIndex) const;
184 };
185 
189 class CPL_DLL CPLJSONDocument
190 {
191 public:
193  CPLJSONDocument();
194  ~CPLJSONDocument();
195  CPLJSONDocument(const CPLJSONDocument &other);
196  CPLJSONDocument& operator=(const CPLJSONDocument &other);
199  bool Save(const std::string &osPath) const;
200  std::string SaveAsString() const;
201 
202  CPLJSONObject GetRoot();
203  const CPLJSONObject GetRoot() const;
204  bool Load(const std::string &osPath);
205  bool LoadMemory(const std::string &osStr);
206  bool LoadMemory(const GByte *pabyData, int nLength = -1);
207  bool LoadChunks(const std::string &osPath, size_t nChunkSize = 16384,
208  GDALProgressFunc pfnProgress = nullptr,
209  void *pProgressArg = nullptr);
210  bool LoadUrl(const std::string &osUrl, char **papszOptions,
211  GDALProgressFunc pfnProgress = nullptr,
212  void *pProgressArg = nullptr);
213 
214 private:
215  mutable JSONObjectH m_poRootJsonObject;
216 };
217 
218 CPL_C_END
219 
220 #endif // CPL_JSON_H_INCLUDED
CPLJSONArray
The JSONArray class JSON array from JSONDocument.
Definition: cpl_json.h:161
GByte
unsigned char GByte
Unsigned byte type.
Definition: cpl_port.h:215
CPLJSONObject::Plain
@ Plain
No extra whitespace or formatting applied.
Definition: cpl_json.h:77
GInt64
GIntBig GInt64
Signed 64 bit integer type.
Definition: cpl_port.h:267
CPLJSONObject::Spaced
@ Spaced
Minimal whitespace inserted.
Definition: cpl_json.h:78
CPL_C_START
#define CPL_C_START
Macro to start a block of C symbols.
Definition: cpl_port.h:337
CPLJSONObject::PrettyFormat
PrettyFormat
Json object format to string options.
Definition: cpl_json.h:76
CPLJSONObject
The CPLJSONArray class holds JSON object from CPLJSONDocument.
Definition: cpl_json.h:54
CPL_C_END
#define CPL_C_END
Macro to end a block of C symbols.
Definition: cpl_port.h:339
CPLJSONObject::Type
Type
Json object types.
Definition: cpl_json.h:61
CPLJSONObject::Add
void Add(const std::string &osName, const std::string &osValue)
Add new key - value pair to json object.
Definition: cpl_json.cpp:457
CPLJSONObject::operator[]
CPLJSONObject operator[](const std::string &osName) const
Get value by key.
Definition: cpl_json.cpp:814
CPLJSONDocument
The CPLJSONDocument class Wrapper class around json-c library.
Definition: cpl_json.h:190