PseudoUuid Class Reference

Wrapper for a UUID. More...

#include <PseudoUuid.h>

List of all members.

Public Member Functions
	PseudoUuid ()
	PseudoUuid (std::string uuid)
virtual	~PseudoUuid ()
void	generate ()
	Generates a new UUID.
void	generateInvalid ()
	Generates a bogus constant UUID.
std::string	toString () const
	Converts the UUID into a string of the form 1b4e28ba-2fa1-11d2-883f-b9a76.
int	hashCode () const
	Returns the hash code for the UUID.
bool	operator== (PseudoUuid const &) const
bool	operator!= (PseudoUuid const &other) const
uint8_t	getByte (int) const
const uint8_t *	getBytes () const
void	parse (std::string uuid) throw (FennelExcn)
	Converts an input UUID string of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb into the internal representation.
Static Public Attributes
static const int	UUID_LENGTH = UUID_LEN_BIN
Protected Attributes
uuid_t	data
uint8_t	data [UUID_LENGTH]

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Detailed Description

Wrapper for a UUID.

Since real UUID generation may not be available on all systems, use this instead (may be real, may be fake). Note that the default constructor leaves the value uninitialized; call generate to get a new UUID.

Definition at line 58 of file PseudoUuid.h.

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Constructor & Destructor Documentation

PseudoUuid::PseudoUuid

(

)

[explicit]

Definition at line 39 of file PseudoUuid.cpp.

References data.

{
    memset(data, 0, sizeof(data));
}

PseudoUuid::PseudoUuid

(

std::string

uuid

)

PseudoUuid::~PseudoUuid

(

)

[virtual]

Definition at line 49 of file PseudoUuid.cpp.

References data.

{
    memset(data, 0, sizeof(data));
}

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Member Function Documentation

void PseudoUuid::generate

(

)

Generates a new UUID.

Definition at line 54 of file PseudoUuid.cpp.

References data, and UUID_LENGTH.

Referenced by PseudoUuidGenerator::generateUuid(), and PseudoUuidTest::testGeneration().

{
#ifdef FENNEL_UUID_REAL_NEW
    uuid_t *apiData;

    uuid_rc_t result = uuid_create(&apiData);
    assert(result == UUID_RC_OK);

    // REVIEW: SWZ: 9/22/2006: Consider using a different mode.  V1 seems
    // weak, but v3 and v5 seem reasonable.  They require arguments, however.
    // Also, uuid_make never returns error for V4, but might for others.
    result = uuid_make(apiData, UUID_MAKE_V4);
    assert(result == UUID_RC_OK);

    size_t len = UUID_LENGTH;
    result =
        uuid_export(
            apiData,
            UUID_FMT_BIN,
            reinterpret_cast<void **>(&data),
            &len);
    assert(result == UUID_RC_OK);

    result = uuid_destroy(apiData);
    assert(result == UUID_RC_OK);
#else

#ifdef FENNEL_UUID_REAL

    uuid_generate(data);

#else

    memset(&data,0,sizeof(data));
#ifdef __MSVC__
    assert(sizeof(data) == sizeof(UUID));
    UuidCreate((UUID *) data);
#else
    int x = rand();
    assert(sizeof(x) <= sizeof(data));
    memcpy(&data,&x,sizeof(x));
#endif

#endif

#endif
}

void PseudoUuid::generateInvalid

(

)

Generates a bogus constant UUID.

Definition at line 102 of file PseudoUuid.cpp.

References data.

Referenced by LogicalTxnTest::LogicalTxnTest(), VersionedSegment::notifyPageDirty(), PseudoUuidTest::testCopy(), PseudoUuidTest::testInvalid(), and VersionedSegmentTest::VersionedSegmentTest().

{
    memset(data, 0xFF, sizeof(data));
}

string PseudoUuid::toString

(

)

const

Converts the UUID into a string of the form 1b4e28ba-2fa1-11d2-883f-b9a76.

Definition at line 139 of file PseudoUuid.cpp.

References data.

Referenced by operator<<(), and PseudoUuidTest::testFormatting().

{
    // NOTE: libuuid has either uuid_unparse or uuid_export (depending on
    // the library's version).  Those two methods produce different output
    // for the same UUID.
    ostringstream ostr;

    for (int i = 0; i < sizeof(data); i++) {
        if (i == 4 || i == 6 || i == 8 || i == 10) {
            ostr << "-";
        }

        ostr << hex << setw(2) << setfill('0') << (int) (data[i] & 0xFF);
    }

    return ostr.str();
}

int PseudoUuid::hashCode

(

)

const

Returns the hash code for the UUID.

Definition at line 130 of file PseudoUuid.cpp.

References data.

{
    return
        ((int)(data[0] ^ data[4] ^ data[8] ^ data[12]) & 0xFF) << 24 |
        ((int)(data[1] ^ data[5] ^ data[9] ^ data[13]) & 0xFF) << 16 |
        ((int)(data[2] ^ data[6] ^ data[10] ^ data[14]) & 0xFF) << 8 |
        ((int)(data[3] ^ data[7] ^ data[11] ^ data[15]) & 0xFF);
}

bool PseudoUuid::operator==

(

PseudoUuid const &

)

const

Definition at line 107 of file PseudoUuid.cpp.

References data.

{
    return (memcmp(data,other.data,sizeof(data)) == 0);
}

bool PseudoUuid::operator!=

(

PseudoUuid const &

other

)

const [inline]

Definition at line 109 of file PseudoUuid.h.

    {
        return !(*this == other);
    }

uint8_t PseudoUuid::getByte

(

int

)

const

Definition at line 114 of file PseudoUuid.cpp.

References data.

Referenced by PseudoUuidTest::testGeneration(), PseudoUuidTest::testInvalid(), and PseudoUuidTest::testParsing().

{
    assert(index < sizeof(data));

    return data[index];
}

const uint8_t * PseudoUuid::getBytes

(

)

const

Definition at line 121 of file PseudoUuid.cpp.

References data.

{
#ifdef FENNEL_UUID_REAL
    return reinterpret_cast<const uint8_t *>(&data);
#else
    return data;
#endif
}

void PseudoUuid::parse

(

std::string

uuid

)

throw (FennelExcn)

Converts an input UUID string of the form 1b4e28ba-2fa1-11d2-883f-b9a761bde3fb into the internal representation.

Exceptions:

FennelExcn

if the String is not in the correct format.

Referenced by JniPseudoUuidGenerator::generateUuid().

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Member Data Documentation

static const int PseudoUuid::UUID_LENGTH = UUID_LEN_BIN [static]

Definition at line 62 of file PseudoUuid.h.

Referenced by generate(), PseudoUuidTest::testGeneration(), PseudoUuidTest::testInvalid(), and PseudoUuidTest::testParsing().

uuid_t PseudoUuid::data [protected]

Definition at line 69 of file PseudoUuid.h.

Referenced by generate(), generateInvalid(), getByte(), getBytes(), hashCode(), operator==(), PseudoUuid(), toString(), and ~PseudoUuid().

uint8_t PseudoUuid::data[UUID_LENGTH] [protected]

Definition at line 77 of file PseudoUuid.h.

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The documentation for this class was generated from the following files:

• /home/pub/open/dev/fennel/common/PseudoUuid.h
• /home/pub/open/dev/fennel/common/PseudoUuid.cpp

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