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cpl_json.h
Go to the documentation of this file.
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 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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
17 * in all copies or substantial portions of the Software.
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,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
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
45 CPL_C_START
46
47 class CPLJSONArray;
53 class CPL_DLL CPLJSONObject
54 {
55 friend class CPLJSONArray;
56 friend class CPLJSONDocument;
57 public:
61 enum class Type {
62 Unknown,
63 Null,
64 Object,
65 Array,
66 Boolean,
67 String,
68 Integer,
69 Long,
70 Double
71 };
72
76 enum class PrettyFormat {
77 Plain,
78 Spaced,
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 AddNoSplitName(const std::string &osName, const CPLJSONObject &oValue);
105 void Add(const std::string &osName, bool bValue);
106 void AddNull(const std::string &osName);
107
108 void Set(const std::string &osName, const std::string &osValue);
109 void Set(const std::string &osName, const char *pszValue);
110 void Set(const std::string &osName, double dfValue);
111 void Set(const std::string &osName, int nValue);
112 void Set(const std::string &osName, GInt64 nValue);
113 void Set(const std::string &osName, bool bValue);
114 void SetNull(const std::string &osName);
115
117 JSONObjectH GetInternalHandle() const { return m_poJsonObject; }
120 // getters
121 std::string GetString(const std::string &osName, const std::string &osDefault = "") const;
122 double GetDouble(const std::string &osName, double dfDefault = 0.0) const;
123 int GetInteger(const std::string &osName, int nDefault = 0) const;
124 GInt64 GetLong(const std::string &osName, GInt64 nDefault = 0) const;
125 bool GetBool(const std::string &osName, bool bDefault = false) const;
126 std::string ToString(const std::string &osDefault = "") const;
127 double ToDouble(double dfDefault = 0.0) const;
128 int ToInteger(int nDefault = 0) const;
129 GInt64 ToLong(GInt64 nDefault = 0) const;
130 bool ToBool(bool bDefault = false) const;
131 CPLJSONArray ToArray() const;
132 std::string Format(PrettyFormat eFormat) const;
133
134 //
135 void Delete(const std::string &osName);
136 CPLJSONArray GetArray(const std::string &osName) const;
137 CPLJSONObject GetObj(const std::string &osName) const;
138 CPLJSONObject operator[](const std::string &osName) const;
139 Type GetType() const;
141 std::string GetName() const { return m_osKey; }
144 std::vector<CPLJSONObject> GetChildren() const;
145 bool IsValid() const;
146 void Deinit();
147
148 protected:
150 CPLJSONObject GetObjectByPath(const std::string &osPath, std::string &osName) const;
153 private:
154 JSONObjectH m_poJsonObject = nullptr;
155 std::string m_osKey{};
156 };
157
161 class CPL_DLL CPLJSONArray : public CPLJSONObject
162 {
163 friend class CPLJSONObject;
164 friend class CPLJSONDocument;
165 public:
167 CPLJSONArray();
168 explicit CPLJSONArray(const std::string &osName);
169 explicit CPLJSONArray(const CPLJSONObject &other);
170
171 private:
172 explicit CPLJSONArray(const std::string &osName, JSONObjectH poJsonObject);
173
174 class CPL_DLL ConstIterator
175 {
176 const CPLJSONArray& m_oSelf;
177 int m_nIdx;
178 mutable CPLJSONObject m_oObj{};
179
180 public:
181 ConstIterator(const CPLJSONArray& oSelf, bool bStart): m_oSelf(oSelf), m_nIdx(bStart ? 0 : oSelf.Size()) {}
182 ~ConstIterator() = default;
183 CPLJSONObject& operator*() const { m_oObj = m_oSelf[m_nIdx]; return m_oObj; }
184 ConstIterator& operator++() { m_nIdx ++; return *this; }
185 bool operator==(const ConstIterator& it) const { return m_nIdx == it.m_nIdx; }
186 bool operator!=(const ConstIterator& it) const { return m_nIdx != it.m_nIdx; }
187 };
188
190 public:
191 int Size() const;
192 void Add(const CPLJSONObject &oValue);
193 void Add(const std::string &osValue);
194 void Add(const char* pszValue);
195 void Add(double dfValue);
196 void Add(int nValue);
197 void Add(GInt64 nValue);
198 void Add(bool bValue);
199 CPLJSONObject operator[](int nIndex);
200 const CPLJSONObject operator[](int nIndex) const;
201
203 ConstIterator begin() const { return ConstIterator(*this, true); }
205 ConstIterator end() const { return ConstIterator(*this, false); }
206 };
207
211 class CPL_DLL CPLJSONDocument
212 {
213 public:
215 CPLJSONDocument();
216 ~CPLJSONDocument();
217 CPLJSONDocument(const CPLJSONDocument &other);
218 CPLJSONDocument& operator=(const CPLJSONDocument &other);
221 bool Save(const std::string &osPath) const;
222 std::string SaveAsString() const;
223
224 CPLJSONObject GetRoot();
225 const CPLJSONObject GetRoot() const;
226 bool Load(const std::string &osPath);
227 bool LoadMemory(const std::string &osStr);
228 bool LoadMemory(const GByte *pabyData, int nLength = -1);
229 bool LoadChunks(const std::string &osPath, size_t nChunkSize = 16384,
230 GDALProgressFunc pfnProgress = nullptr,
231 void *pProgressArg = nullptr);
232 bool LoadUrl(const std::string &osUrl, const char* const* papszOptions,
233 GDALProgressFunc pfnProgress = nullptr,
234 void *pProgressArg = nullptr);
235
236 private:
237 mutable JSONObjectH m_poRootJsonObject;
238 };
239
240 CPL_C_END
241
242 #endif // CPL_JSON_H_INCLUDED
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
GByte
unsigned char GByte
Unsigned byte type.
Definition: cpl_port.h:215
CPLJSONObject::Type
Type
Json object types.
Definition: cpl_json.h:61
CPLJSONArray::begin
ConstIterator begin() const
Iterator to first element.
Definition: cpl_json.h:203
CPLJSONObject
The CPLJSONArray class holds JSON object from CPLJSONDocument.
Definition: cpl_json.h:53
CPLJSONArray::end
ConstIterator end() const
Iterator to after last element.
Definition: cpl_json.h:205
CPL_C_END
#define CPL_C_END
Macro to end a block of C symbols.
Definition: cpl_port.h:339
CPLJSONDocument
The CPLJSONDocument class Wrapper class around json-c library.
Definition: cpl_json.h:211
GInt64
GIntBig GInt64
Signed 64 bit integer type.
Definition: cpl_port.h:267
CPLJSONArray::Size
int Size() const
Get array size.
Definition: cpl_json.cpp:1247
CPLJSONArray
The JSONArray class JSON array from JSONDocument.
Definition: cpl_json.h:161