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// -*- c++ -*-
// (c) 2007-2012 Ulrich Germann
#ifndef __ug_mm_2d_table_h
#define __ug_mm_2d_table_h
#include <boost/iostreams/device/mapped_file.hpp>
#include <boost/shared_ptr.hpp>
#include <vector>
#include <map>
#include "tpt_typedefs.h"
#include "tpt_pickler.h"
#include "ug_typedefs.h"
#include "util/exception.hh"
namespace bio=boost::iostreams;
namespace ugdiss
{
// using namespace std;
template<typename OFFSET, typename ID, typename VAL, typename INIT>
class
mm2dTable
{
public:
struct Cell
{
ID id;
VAL val;
bool
operator<(ID const otherId) const
{
return id < otherId;
}
bool
operator<(Cell const& other) const
{
return id < other.id;
}
struct SortDescendingByValue
{
bool operator()(Cell const& a, Cell const& b) const
{
return a.val > b.val;
}
};
};
struct Row
{
Cell const* start;
Cell const* stop;
VAL operator[](ID key) const;
};
Cell const* data;
VAL const* M1;
VAL const* M2;
OFFSET const* index;
ID numRows;
ID numCols;
boost::shared_ptr<bio::mapped_file_source> file;
VAL m1(ID key) const
{
return (key < numRows) ? M1[key] : INIT(0);
}
VAL m2(ID key) const
{
return (key < numCols) ? M2[key] : INIT(0);
}
void open(std::string fname);
void close();
Row operator[](ID key) const;
mm2dTable(std::string const fname="") { if (!fname.empty()) open(fname); };
~mm2dTable() { file.reset(); };
};
template<typename OFFSET, typename ID, typename VAL, typename INIT>
typename mm2dTable<OFFSET,ID,VAL,INIT>::Row
mm2dTable<OFFSET,ID,VAL,INIT>::
operator[](ID key) const
{
Row ret;
if (key < numRows)
{
ret.start = data+index[key];
ret.stop = data+index[key+1];
}
else
ret.start = ret.stop = data+index[key+1];
return ret;
}
template<typename OFFSET, typename ID, typename VAL, typename INIT>
VAL
mm2dTable<OFFSET,ID,VAL,INIT>::
Row::
operator[](ID key) const
{
if (start==stop) return INIT(0);
Cell const* c = std::lower_bound(start,stop,key);
return (c != stop && c->id == key ? c->val : INIT(0));
}
template<typename OFFSET, typename ID, typename VAL, typename INIT>
void
mm2dTable<OFFSET,ID,VAL,INIT>::
open(std::string fname)
{
// cout << "opening " << fname << " at " << __FILE__ << ":" << __LINE__ << std::endl;
if (access(fname.c_str(),R_OK))
{
std::ostringstream msg;
msg << "[" << __FILE__ << ":" << __LINE__ <<"] FATAL ERROR: "
<< "file '" << fname << " is not accessible." << std::endl;
std::string foo = msg.str();
UTIL_THROW(util::Exception,foo.c_str());
}
file.reset(new bio::mapped_file_source());
file->open(fname);
if (!file->is_open())
{
std::ostringstream msg;
msg << "[" << __FILE__ << ":" << __LINE__ <<"] FATAL ERROR: "
<< "Opening file '" << fname << "' failed." << std::endl;
std::string foo = msg.str();
UTIL_THROW(util::Exception,foo.c_str());
}
char const* p = file->data();
filepos_type offset = *reinterpret_cast<filepos_type const*>(p);
index = reinterpret_cast<OFFSET const*>(p+offset); p += sizeof(offset);
numRows = *reinterpret_cast<ID const*>(p); p += sizeof(id_type);
numCols = *reinterpret_cast<ID const*>(p); p += sizeof(id_type);
data = reinterpret_cast<Cell const*>(p);
// cout << numRows << " rows; " << numCols << " columns " << std::endl;
M1 = reinterpret_cast<VAL const*>(index+numRows+1);
M2 = M1+numRows;
// cout << "Table " << fname << " has " << numRows << " rows and "
// << numCols << " columns." << std::endl;
// cout << "File size is " << file.size()*1024 << " bytes; ";
// cout << "M2 starts " << (reinterpret_cast<char const*>(M2) - file.data())
// << " bytes into the file" << std::endl;
// cout << M2[0] << std::endl;
}
template<
typename OFFSET, // integer type of file offsets
typename ID, // integer type of column ids
typename VAL, // type of cell values
typename INIT, // INIT(0) initializes default values
typename ICONT // inner container type
>
void
write_mm_2d_table(std::ostream& out, std::vector<ICONT> const& T,
std::vector<VAL> const* m1 = NULL,
std::vector<VAL> const* m2 = NULL)
{
assert(T.size());
typedef typename ICONT::const_iterator iter;
// compute marginals if necessary
std::vector<VAL> m1x,m2x;
if (!m1)
{
m1x.resize(T.size(),INIT(0));
for (size_t r = 0; r < T.size(); ++r)
for (iter c = T.at(r).begin(); c != T.at(r).end(); ++c)
m1x[r] = m1x[r] + c->second;
m1 = &m1x;
}
if (!m2)
{
for (size_t r = 0; r < T.size(); ++r)
for (iter c = T.at(r).begin(); c != T.at(r).end(); ++c)
{
while (c->first >= m2x.size())
m2x.push_back(INIT(0));
m2x[c->first] = m2x[c->first] + c->second;
}
m2 = &m2x;
}
filepos_type idxOffset=0;
numwrite(out,idxOffset); // place holder, we'll return here at the end
numwrite(out,id_type(m1->size())); // number of rows
numwrite(out,id_type(m2->size())); // number of columns
// write actual table
std::vector<OFFSET> index;
size_t ctr =0;
index.reserve(m1->size()+1);
for (ID r = 0; r < ID(T.size()); ++r)
{
//index.push_back(out.tellp());
index.push_back(ctr);
ID lastId = 0;
if (T.at(r).size())
lastId = T.at(r).begin()->first;
for (typename ICONT::const_iterator c = T.at(r).begin();
c != T.at(r).end(); ++c)
{
ctr++;
assert(c->first >= lastId);
lastId = c->first;
typename mm2dTable<OFFSET,ID,VAL,INIT>::Cell item;
item.id = c->first;
item.val = c->second;
out.write(reinterpret_cast<char const*>(&item),sizeof(item));
}
}
// index.push_back(out.tellp());
index.push_back(ctr);
idxOffset=out.tellp();
// write index
for (size_t i = 0; i < index.size(); ++i)
{
OFFSET o = index[i]; // (index[i]-index[0])/sizeof(VAL);
out.write(reinterpret_cast<char*>(&o),sizeof(OFFSET));
}
// write marginals
out.write(reinterpret_cast<char const*>(&(*m1)[0]),m1->size()*sizeof(VAL));
out.write(reinterpret_cast<char const*>(&(*m2)[0]),m2->size()*sizeof(VAL));
out.seekp(0);
numwrite(out,idxOffset);
}
}
#endif
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