FileReader Class Reference

Caches a text file into memory and can be used to retrieve lines from it. More...

#include <modules.h>

Inheritance diagram for FileReader:

[legend]Collaboration diagram for FileReader:

[legend]List of all members.

Public Member Functions
	FileReader ()
	Default constructor.
	FileReader (std::string filename)
	Secondary constructor.
	~FileReader ()
	Default destructor.
void	LoadFile (std::string filename)
	Used to load a file.
bool	Exists ()
	Returns true if the file exists This function will return false if the file could not be opened.
std::string	GetLine (int x)
	Retrieve one line from the file.
int	FileSize ()
	Returns the size of the file in lines.
Private Attributes
file_cache	fc

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Detailed Description

Caches a text file into memory and can be used to retrieve lines from it.

This class contains methods for read-only manipulation of a text file in memory. Either use the constructor type with one parameter to load a file into memory at construction, or use the LoadFile method to load a file.

Definition at line 1618 of file modules.h.

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Constructor & Destructor Documentation

FileReader::FileReader (   )

Default constructor. This method does not load any file into memory, you must use the LoadFile method after constructing the class this way. Definition at line 894 of file modules.cpp. { }

FileReader::FileReader (  std::string  filename  )

Secondary constructor. This method initialises the class with a file loaded into it ready for GetLine and and other methods to be called. If the file could not be loaded, FileReader::FileSize returns 0. Definition at line 887 of file modules.cpp. References fc. { file_cache c; readfile(c,filename.c_str()); this->fc = c; }

FileReader::~FileReader (   )

Default destructor. This deletes the memory allocated to the file. Definition at line 906 of file modules.cpp. { }

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Member Function Documentation

bool FileReader::Exists (   )

Returns true if the file exists This function will return false if the file could not be opened. Definition at line 910 of file modules.cpp. References fc. { if (fc.size() == 0) { return(false); } else { return(true); } }

int FileReader::FileSize (   )

Returns the size of the file in lines. This method returns the number of lines in the read file. If it is 0, no lines have been read into memory, either because the file is empty or it does not exist, or cannot be opened due to permission problems. Definition at line 929 of file modules.cpp. References fc. { return fc.size(); }

std::string FileReader::GetLine (  int  x  )

Retrieve one line from the file. This method retrieves one line from the text file. If an empty non-NULL string is returned, the index was out of bounds, or the line had no data on it. Definition at line 922 of file modules.cpp. References fc. { if ((x<0) || ((unsigned)x>fc.size())) return ""; return fc[x]; }

void FileReader::LoadFile (  std::string  filename  )

Used to load a file. This method loads a file into the class ready for GetLine and and other methods to be called. If the file could not be loaded, FileReader::FileSize returns 0. Definition at line 898 of file modules.cpp. References fc. { file_cache c; readfile(c,filename.c_str()); this->fc = c; }

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Member Data Documentation

file_cache FileReader::fc [private]

Definition at line 1620 of file modules.h. Referenced by Exists(), FileReader(), FileSize(), GetLine(), and LoadFile().

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

• modules.h
• modules.cpp

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