7c87c6cc27
Add UUID::to_sstring() method, analogous to the Java UUID.toString(), and I verified that it generates the same output as the original Java method. Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com> [avi: make it build, using sprint() instead of sprintf()]
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
#pragma once
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/*
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* Copyright 2015 Cloudius Systems.
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*/
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// This class is the parts of java.util.UUID that we need
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#include <stdint.h>
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#include <cassert>
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#include "core/sstring.hh"
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#include "core/print.hh"
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namespace utils {
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class UUID {
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private:
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int64_t most_sig_bits;
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int64_t least_sig_bits;
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public:
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UUID(int64_t most_sig_bits, int64_t least_sig_bits)
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: most_sig_bits(most_sig_bits), least_sig_bits(least_sig_bits) {}
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int64_t get_most_significant_bits() const {
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return most_sig_bits;
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}
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int64_t get_least_significant_bits() const {
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return least_sig_bits;
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}
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int version() const {
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return (most_sig_bits >> 12) & 0xf;
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}
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int64_t timestamp() const {
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//if (version() != 1) {
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// throw new UnsupportedOperationException("Not a time-based UUID");
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//}
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assert(version() == 1);
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return ((most_sig_bits & 0xFFF) << 48) |
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(((most_sig_bits >> 16) & 0xFFFF) << 32) |
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(((uint64_t)most_sig_bits) >> 32);
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}
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// This matches Java's UUID.toString() actual implementation. Note that
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// that method's documentation suggest something completely different!
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sstring to_sstring() const {
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return sprint("%08x-%04x-%04x-%04x-%012x",
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((uint64_t)most_sig_bits >> 32),
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((uint64_t)most_sig_bits >> 16 & 0xffff),
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((uint64_t)most_sig_bits & 0xffff),
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((uint64_t)least_sig_bits >> 48 & 0xffff),
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((uint64_t)least_sig_bits & 0xffffffffffffLL));
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}
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};
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UUID make_random_uuid();
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}
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