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//////////////////////////////////////////////////////////////////////////
//
// pgScript - PostgreSQL Tools
//
// Copyright (C) 2002 - 2014, The pgAdmin Development Team
// This software is released under the PostgreSQL Licence
//
//////////////////////////////////////////////////////////////////////////
#include "pgAdmin3.h"
#include "pgscript/generators/pgsIntegerGen.h"
pgsIntegerGen::pgsSequentialIntGen::pgsSequentialIntGen(const MAPM &range,
const long &seed) :
pgsNumberGen(range), m_state(seed), m_m(2), m_remainder(m_range)
{
MAPM _2 = 2;
while (m_m < m_range)
{
m_m = m_m * _2;
}
m_buffer.Alloc(BUFFER_SIZE);
}
MAPM pgsIntegerGen::pgsSequentialIntGen::random()
{
// Bufferizer BUFFER_SIZE values in the vector
if (m_buffer.GetCount() == 0)
{
// Calculate the number of elements to bufferize
MAPM min = wxMin(m_remainder, MAPM(BUFFER_SIZE));
// Generate those elements
for (MAPM i = 0; i < min; i = i + 1)
{
do
{
m_state = (m_state * arg_a);
m_state = (m_state + arg_c) % m_m;
}
while (m_state >= m_range);
m_buffer.Add(m_state);
m_remainder -= 1;
}
class pgsRandInt
{
private:
long m_state;
public:
pgsRandInt(long n)
: m_state(n)
{
}
long rand()
{
m_state = (1103515245L * m_state + 12345L) % 2147483647L;
return m_state;
}
};
// Shuffle the vector of generated values
pgsRandInt rand_int(BUFFER_SIZE);
for (size_t i = 0; i < m_buffer.GetCount(); i++)
{
size_t r = i + (rand_int.rand() % (m_buffer.GetCount() - i));
const MAPM a = m_buffer.Item(i);
m_buffer.Item(i) = m_buffer.Item(r);
m_buffer.Item(r) = a;
}
}
if (m_remainder == 0)
{
m_remainder = m_range;
}
// Take the last bufferized value
MAPM data = m_buffer.Last();
m_buffer.RemoveAt(m_buffer.GetCount() - 1);
// Return random value
return data;
}
pgsIntegerGen::pgsSequentialIntGen::~pgsSequentialIntGen()
{
}
pgsNumberGen *pgsIntegerGen::pgsSequentialIntGen::clone()
{
return pnew pgsIntegerGen::pgsSequentialIntGen(*this);
}
const MAPM pgsIntegerGen::pgsSequentialIntGen::arg_a = 5;
const MAPM pgsIntegerGen::pgsSequentialIntGen::arg_c = 1;
pgsIntegerGen::pgsNormalIntGen::pgsNormalIntGen(const MAPM &range,
const long &seed) :
pgsNumberGen(range), m_state(seed), m_top(arg_m - 1)
{
for (int i = 0; i < 10; i++)
random(); // Beginning of the sequence is garbage
}
MAPM pgsIntegerGen::pgsNormalIntGen::random()
{
m_state = (m_state * arg_a);
m_state = (m_state + arg_c) % arg_m;
return (m_state * m_range).div(m_top);
}
pgsIntegerGen::pgsNormalIntGen::~pgsNormalIntGen()
{
}
pgsNumberGen *pgsIntegerGen::pgsNormalIntGen::clone()
{
return pnew pgsIntegerGen::pgsNormalIntGen(*this);
}
const MAPM pgsIntegerGen::pgsNormalIntGen::arg_a = 16807L;
const MAPM pgsIntegerGen::pgsNormalIntGen::arg_c = 0;
const MAPM pgsIntegerGen::pgsNormalIntGen::arg_m = 2147483647L;
pgsIntegerGen::pgsIntegerGen(const MAPM &min, const MAPM &max,
const bool &sequence, const long &seed) :
pgsObjectGen(seed), m_min(wxMin(min, max)), m_max(wxMax(min, max)),
m_range(m_max - m_min + 1), m_sequence(sequence)
{
m_randomizer = is_sequence()
? pgsRandomizer(pnew pgsSequentialIntGen(m_range, m_seed))
: pgsRandomizer(pnew pgsNormalIntGen(m_range, m_seed));
}
bool pgsIntegerGen::is_sequence() const
{
return m_sequence;
}
wxString pgsIntegerGen::random()
{
MAPM data = m_randomizer->random();
data = data + m_min;
wxASSERT(data >= m_min && data <= m_max);
return pgsMapm::pgs_mapm_str(data);
}
long pgsIntegerGen::random_long()
{
long result;
random().ToLong(&result);
return result;
}
pgsIntegerGen::~pgsIntegerGen()
{
}
pgsIntegerGen *pgsIntegerGen::clone()
{
return pnew pgsIntegerGen(*this);
}
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