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[toc] / antlr4-cpp-runtime-4.9.2-source / runtime / src / support / guid.h

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+/*
+ The MIT License (MIT)
+
+ Copyright (c) 2014 Graeme Hill (http://graemehill.ca)
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+ */
+#pragma once
+
+#include <iostream>
+#include <vector>
+#include <sstream>
+#include <string>
+#include <iomanip>
+#include <stdint.h>
+
+#ifdef GUID_ANDROID
+#include <jni.h>
+#endif
+
+// Class to represent a GUID/UUID. Each instance acts as a wrapper around a
+// 16 byte value that can be passed around by value. It also supports
+// conversion to string (via the stream operator <<) and conversion from a
+// string via constructor.
+class Guid
+{
+public:
+
+  // create a guid from vector of bytes
+  Guid(const std::vector<unsigned char> &bytes);
+
+  // create a guid from array of bytes
+  Guid(const unsigned char *bytes);
+
+  // Create a guid from array of words.
+  Guid(const uint16_t *bytes, bool reverse);
+
+  // create a guid from string
+  Guid(const std::string &fromString);
+
+  // create empty guid
+  Guid();
+
+  // copy constructor
+  Guid(const Guid &other);
+
+  // overload assignment operator
+  Guid &operator=(const Guid &other);
+
+  // overload equality and inequality operator
+  bool operator==(const Guid &other) const;
+  bool operator!=(const Guid &other) const;
+
+  const std::string toString() const;
+  std::vector<unsigned char>::const_iterator begin() { return _bytes.begin(); }
+  std::vector<unsigned char>::const_iterator end() { return _bytes.end(); }
+  std::vector<unsigned char>::const_reverse_iterator rbegin() { return _bytes.rbegin(); }
+  std::vector<unsigned char>::const_reverse_iterator rend() { return _bytes.rend(); }
+
+
+private:
+
+  // actual data
+  std::vector<unsigned char> _bytes;
+
+  // make the << operator a friend so it can access _bytes
+  friend std::ostream &operator<<(std::ostream &s, const Guid &guid);
+};
+
+// Class that can create new guids. The only reason this exists instead of
+// just a global "newGuid" function is because some platforms will require
+// that there is some attached context. In the case of android, we need to
+// know what JNIEnv is being used to call back to Java, but the newGuid()
+// function would no longer be cross-platform if we parameterized the android
+// version. Instead, construction of the GuidGenerator may be different on
+// each platform, but the use of newGuid is uniform.
+class GuidGenerator
+{
+public:
+#ifdef GUID_ANDROID
+  GuidGenerator(JNIEnv *env);
+#else
+  GuidGenerator() { }
+#endif
+
+  Guid newGuid();
+
+#ifdef GUID_ANDROID
+private:
+  JNIEnv *_env;
+  jclass _uuidClass;
+  jmethodID _newGuidMethod;
+  jmethodID _mostSignificantBitsMethod;
+  jmethodID _leastSignificantBitsMethod;
+#endif
+};