ConfigFile Class Reference

#include <NuFCConfig.h>

List of all members.

Public Member Functions
	ConfigFile (std::string filename)
string	GetString (string key, string section="", string defaultval="")
int	GetInt (string key, string section="", int defaultval=0)
double	GetFloat (string key, string section="", double defaultval=0.0)
bool	GetBool (string key, string section="", bool defaultval=false)
Private Member Functions
std::string	Decomment (const std::string &source)
	Strips the comments from a line.
std::string	Trim (const std::string &source)
	Trims the whitespace off of the beginning and end of a string.
void	ReadFile (std::ifstream &cfgfile)
	Controls the file reading.
bool	IsSectionChange (const string &line)
	Tests for a section change in a line.
string	Section (const string &line)
	Reads the section string out of a line.
bool	ReadKeyPair (const string &section, const string &line)
	Reads a key-pair out of a line.
Private Attributes
std::map< std::string, std::map< std::string, std::string > >	fStore
	The storage for the group/key-value from the file.

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Constructor & Destructor Documentation

ConfigFile::ConfigFile (  std::string  filename  )

Try opening the file Otherwise, we are blank! Nothing more needs to be done.... Definition at line 105 of file NuFCConfig.cxx. References MSG, and ReadFile(). { ifstream cfg(filename.c_str()); if(cfg.is_open()) { // All is well, read the file in! ReadFile(cfg); } else { // Print an error message if we were trying to open a file if (filename != "") { MSG("ConfigFile",Msg::kFatal) << "Could not read configuration file " << filename << endl; throw runtime_error("Could not read configuration file."); } } }

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Member Function Documentation

string ConfigFile::Decomment (  const std::string &  source  )  [private]

Strips the comments from a line. Definition at line 125 of file NuFCConfig.cxx. Referenced by ReadFile(). { // Strips comments from a line // Find any instances of '#', and then remove them int comment = source.find_first_of("#%"); if (comment == -1) return source; return source.substr(0, comment); }

bool ConfigFile::GetBool (  string  key, string  section = "", bool  defaultval = false )

Definition at line 277 of file NuFCConfig.cxx. References fStore, and MAXMSG. Referenced by NuFCConfig::LoadConfig(). { string value = fStore[section][key]; if (value.size() == 0) return defaultval; // Now try to work out what it is if (value == "True" || value == "true") return true; if (value == "False" || value == "false") return false; // Try to convert to an integer, and see if it is non-zero istringstream iss (value); int ival = 0; iss >> ival; // It worked - just return the value if (!iss.fail()) { return ival; } // It failed..... give up here for now MAXMSG("ConfigFile",5,Msg::kWarning) << "Failed to read [" << section << "]." << key << " = " << value << " as boolean" << endl; return defaultval; }

double ConfigFile::GetFloat (  string  key, string  section = "", double  defaultval = 0.0 )

Definition at line 258 of file NuFCConfig.cxx. References fStore, and MAXMSG. Referenced by NuFCConfig::LoadConfig(). { string value = fStore[section][key]; if (value.size() == 0) return defaultval; // Attempt to read an integer out of this stream istringstream iss (value); double ival = 0.0; iss >> ival; if (!iss.fail()) { return ival; } else { MAXMSG("ConfigFile",5,Msg::kWarning) << "Failed to read [" << section << "]." << key << " = " << value << " as integer" << endl; return defaultval; } }

int ConfigFile::GetInt (  string  key, string  section = "", int  defaultval = 0 )

Definition at line 239 of file NuFCConfig.cxx. References fStore, and MAXMSG. { string value = fStore[section][key]; if (value.size() == 0) return defaultval; // Attempt to read an integer out of this stream istringstream iss (value); int ival = 0; iss >> ival; if (!iss.fail()) { return ival; } else { MAXMSG("ConfigFile",5,Msg::kWarning) << "Failed to read [" << section << "]." << key << " = " << value << " as integer" << endl; return defaultval; } }

string ConfigFile::GetString (  string  key, string  section = "", string  defaultval = "" )

Definition at line 229 of file NuFCConfig.cxx. References fStore. Referenced by NuFCConfig::LoadConfig(). { string value = fStore[section][key]; if (value.size() == 0) return defaultval; else return value; }

bool ConfigFile::IsSectionChange (  const string &  line  )  [private]

Tests for a section change in a line. Definition at line 177 of file NuFCConfig.cxx. References MSG. Referenced by ReadFile(). { // Work out if this is a change of section by checking the first char if (line[0] == '[') { // Check the last char too if (line[line.size()-1] != ']') { // cout << "Warning Parsing file " << lineNo << ": Invalid section change!" << endl; MSG("ConfigFile",Msg::kWarning) << "Invalid section change: " << line << endl; } else { // Both start and ends are valid... is a section change line // Make sure it is valid string newsec = line.substr(1, line.size()-2); if (newsec.size() == 0) { MSG("ConfigFile", Msg::kWarning) << "Invalid Section Change: Section cannot be blank" << endl; } else { return true; } } } return false; }

void ConfigFile::ReadFile (  std::ifstream &  cfgfile  )  [private]

Controls the file reading. Definition at line 143 of file NuFCConfig.cxx. References Decomment(), IsSectionChange(), MSG, ReadKeyPair(), Section(), and Trim(). Referenced by ConfigFile(). { int lineNo = 0; string line, section = ""; // Loop over all lines in the file while(std::getline(file, line)) { ++lineNo; // Clean up the line line = Decomment(line); line = Trim(line); // Ignore blank lines if (line.size() == 0) continue; // Several paths here: Section header, Key-Value pair or invalid. // First test for section header if (IsSectionChange(line)) { section = Section(line); continue; } // Must be a key pair, or invalid if (!ReadKeyPair(section, line)) { MSG("ConfigFile",Msg::kWarning) << "Invalid line " << lineNo << ": \"" << line << "\"" << endl; } } // Go to next line }

bool ConfigFile::ReadKeyPair (  const string &  section, const string &  line )  [private]

Reads a key-pair out of a line. Definition at line 209 of file NuFCConfig.cxx. References fStore, and Trim(). Referenced by ReadFile(). { // Check to see if this is a key pair int split = line.find_first_of("=:"); // what if we don't find a split? if (split == -1) { // MSG("ConfigFile",Msg::kWarning) << "Invalid key-value pair: \"" << line << "\"" << endl; return false; } // Read out the values string key = Trim(line.substr(0, split)); string keyval = Trim(line.substr(split+1, line.size()-split+2)); fStore[section][key] = keyval; return true; }

string ConfigFile::Section (  const string &  line  )  [private]

Reads the section string out of a line. Definition at line 201 of file NuFCConfig.cxx. Referenced by ReadFile(). { // Extracts the section from a line string newsec = line.substr(1, line.size()-2); return newsec; }

string ConfigFile::Trim (  const std::string &  source  )  [private]

Trims the whitespace off of the beginning and end of a string. Definition at line 134 of file NuFCConfig.cxx. Referenced by ReadFile(), and ReadKeyPair(). { // Find the first non-whitespace int first = source.find_first_not_of("\n\r\t "); int last = source.find_last_not_of("\n\r\t "); if (last == -1) return ""; return source.substr(first, last - first + 1); }

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Member Data Documentation

std::map<std::string, std::map<std::string, std::string> > ConfigFile::fStore [private]

The storage for the group/key-value from the file. Definition at line 87 of file NuFCConfig.h. Referenced by GetBool(), GetFloat(), GetInt(), GetString(), and ReadKeyPair().

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

• NuFCConfig.h
• NuFCConfig.cxx

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