summaryrefslogtreecommitdiffstats
path: root/wsrep-lib/include/wsrep/id.hpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--wsrep-lib/include/wsrep/id.hpp105
1 files changed, 105 insertions, 0 deletions
diff --git a/wsrep-lib/include/wsrep/id.hpp b/wsrep-lib/include/wsrep/id.hpp
new file mode 100644
index 00000000..fc1e82b2
--- /dev/null
+++ b/wsrep-lib/include/wsrep/id.hpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2018 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file id.hpp
+ *
+ * A generic identifier utility class.
+ */
+#ifndef WSREP_ID_HPP
+#define WSREP_ID_HPP
+
+#include "exception.hpp"
+
+#include <iosfwd>
+#include <cstring> // std::memset()
+
+namespace wsrep
+{
+ /**
+ * The idientifier class stores identifiers either in UUID
+ * format or in string format. The storage format is decided
+ * upon construction. If the given string contains a valid
+ * UUID, the storage format will be binary. Otherwise the
+ * string will be copied verbatim. If the string format is used,
+ * the maximum length of the identifier is limited to 16 bytes.
+ */
+ class id
+ {
+ public:
+ typedef struct native_type { unsigned char buf[16]; } native_type;
+ /**
+ * Default constructor. Constructs an empty identifier.
+ */
+ id() : data_() { std::memset(data_.buf, 0, sizeof(data_.buf)); }
+
+ /**
+ * Construct from string. The input string may contain either
+ * valid UUID or a string with maximum 16 bytes length.
+ */
+ id(const std::string&);
+
+ /**
+ * Construct from void pointer.
+ */
+ id (const void* data, size_t size) : data_()
+ {
+ if (size > 16)
+ {
+ throw wsrep::runtime_error("Too long identifier");
+ }
+ std::memset(data_.buf, 0, sizeof(data_.buf));
+ std::memcpy(data_.buf, data, size);
+ }
+
+ bool operator<(const id& other) const
+ {
+ return (std::memcmp(data_.buf, other.data_.buf, sizeof(data_.buf)) < 0);
+ }
+
+ bool operator==(const id& other) const
+ {
+ return (std::memcmp(data_.buf, other.data_.buf, sizeof(data_.buf)) == 0);
+ }
+ bool operator!=(const id& other) const
+ {
+ return !(*this == other);
+ }
+ const void* data() const { return data_.buf; }
+
+ size_t size() const { return sizeof(data_); }
+
+ bool is_undefined() const
+ {
+ return (*this == undefined());
+ }
+
+ static const wsrep::id& undefined()
+ {
+ return undefined_;
+ }
+ private:
+ static const wsrep::id undefined_;
+ native_type data_;
+ };
+
+ std::ostream& operator<<(std::ostream&, const wsrep::id& id);
+ std::istream& operator>>(std::istream&, wsrep::id& id);
+}
+
+#endif // WSREP_ID_HPP