void SamFile::init(const char* filename, OpenType mode, SamFileHeader* header)
{
init();
resetFile();
bool openStatus = true;
if(mode == READ)
{
// open the file for read.
openStatus = OpenForRead(filename, header);
}
else
{
// open the file for write.
openStatus = OpenForWrite(filename, header);
}
if(!openStatus)
{
// Failed to open the file - print error and abort.
fprintf(stderr, "%s\n", GetStatusMessage());
std::cerr << "FAILURE - EXITING!!!" << std::endl;
exit(-1);
}
}
bool Create(const std::string &suffix)
{
std::error_code ec;
m_ptempFilePath = fs::temp_file_path(suffix, ec);
if (ec)
return false;
if (m_ptempFilePath.empty())
return false;
OpenForWrite(m_ptempFilePath.c_str(), true);
return true;
}
//*************************************************************************
//
// TheBard is a sample application that configures a BitFunnel index based
// on a small corpus of 154 Shakespeare sonnets. This standalone example
// performs an end-to-end configuration, including corpus statistics
// analysis and TermTable construction.
//
// The sonnets are incorporated into the codebase as cstrings, allowing the
// example to run without touching the filesystem.
//
//*************************************************************************
void Run(bool verbose)
{
//
// This example uses the RAM filesystem.
//
auto fileSystem = BitFunnel::Factories::CreateRAMFileSystem();
auto fileManager =
BitFunnel::Factories::CreateFileManager(
"config",
"statistics",
"index",
*fileSystem);
//
// Initialize RAM filesystem with input files.
//
{
std::cout << "Initializing RAM filesystem." << std::endl;
// Open the manifest file.
auto manifest = fileSystem->OpenForWrite("manifest.txt");
// Iterate over sequence of Shakespeare sonnet chunk data.
for (size_t i = 0; i < Sonnets::chunks.size(); ++i)
{
// Create chunk file name, and write chunk data.
std::stringstream name;
name << "sonnet" << i;
auto out = fileSystem->OpenForWrite(name.str().c_str());
// TODO: consider checking for cast overflow?
out->write(Sonnets::chunks[i].second,
static_cast<std::streamsize>(Sonnets::chunks[i].first));
// Add chunk file to manifest.
*manifest << name.str() << std::endl;
}
}
//
// Create the BitFunnelTool based on the RAM filesystem.
//
BitFunnel::BitFunnelTool tool(*fileSystem);
//
// Use the tool to run the statistics builder.
//
{
std::cout << "Gathering corpus statistics." << std::endl;
std::vector<char const *> argv = {
"BitFunnel",
"statistics",
"manifest.txt",
"config",
"-text"
};
std::stringstream ignore;
std::ostream& out = (verbose) ? std::cout : ignore;
tool.Main(std::cin,
out,
static_cast<int>(argv.size()),
argv.data());
}
//
// Use the tool to run the TermTable builder.
//
{
std::cout << "Building the TermTable." << std::endl;
std::vector<char const *> argv = {
"BitFunnel",
"termtable",
"config",
"0.1",
"PrivateSharedRank0ToN"
};
std::stringstream ignore;
std::ostream& out = (verbose) ? std::cout : ignore;
auto result = tool.Main(std::cin,
out,
static_cast<int>(argv.size()),
argv.data());
CHECK_EQ(result, 0) << "TermTableBuilder failed.";
std::cout
<< "Index is now configured."
<< std::endl
<< std::endl;
}
//
// Use the tool to run the REPL.
//
{
std::vector<char const *> argv = {
"BitFunnel",
"repl",
"config"
};
tool.Main(std::cin,
std::cout,
static_cast<int>(argv.size()),
argv.data());
}
}
