325 lines
9.2 KiB
C++
325 lines
9.2 KiB
C++
#include "exceptions.h"
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#include "teacher.h"
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#include "tools.h"
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#include <fstream>
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#include <iomanip>
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#include <iostream>
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using std::cin;
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using std::cout;
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using std::endl;
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using std::flush;
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enum workmode {
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createFile = 1,
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appendData,
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changeData,
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searchData,
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displayAll,
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quit
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};
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workmode displayMainMenu() {
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int userSelection;
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cout << setMiddle(62, "+", "") << endl;
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cout << "+"
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<< setMiddle(60, " ", "Contoso Company Employee Management System")
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<< "+" << endl;
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cout << setMiddle(62, "+", "") << endl;
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cout << "\n";
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cout << setMiddle(60, " ", "Main menu") << "\n";
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cout << setMiddle(60, " ", "1. Import data") << "\n";
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cout << setMiddle(60, " ", "2. Append data") << "\n";
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cout << setMiddle(60, " ", "3. Change data") << "\n";
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cout << setMiddle(60, " ", "4. Search data") << "\n";
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cout << setMiddle(60, " ", "5. Display all") << "\n";
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cout << setMiddle(60, " ", "6. Quit ") << endl;
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do {
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cout << "\nPlease select: ";
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cin >> userSelection;
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if (cin.fail()) {
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cin.clear();
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cin.ignore();
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userSelection = 0;
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}
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if (1 <= userSelection && userSelection <= (int)quit) {
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return (workmode)userSelection;
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}
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cout << "Unknown selection. Try again." << endl;
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} while (true);
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}
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void doCreateFile() {
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std::string fileName;
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cout << "New file name (file with same name will be replaced): " << flush;
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cin >> fileName;
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std::fstream outfile(fileName, std::ios::out | std::ios::binary);
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outfile.exceptions(std::ios_base::failbit | std::ios_base::badbit);
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if (!outfile.is_open()) {
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throw(FileOpenException(fileName));
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}
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cout << "Start reading in new Teacher data. How many do you want to create?"
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<< endl;
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int count = 1, total = 0;
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total = askValidInt();
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while (count <= total) {
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cout << "\033[1;32mTeacher " << count << "/" << total << ":\033[0m"
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<< endl;
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Teacher aTeacher(true);
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try {
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outfile.write((char *)&aTeacher, sizeof(aTeacher));
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}
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catch (std::ios_base::failure) {
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throw(FileWriteException(fileName, write));
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}
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cout << "Created " << count++ << " new teacher. (Total " << total << ")"
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<< endl;
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}
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try {
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outfile.write((char *)&total, sizeof(total));
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}
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catch (std::ios_base::failure) {
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throw(FileWriteException(fileName, write));
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};
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outfile.close();
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}
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void doAppendData() {
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std::string fileName;
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cout << "File name: " << flush;
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cin >> fileName;
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std::fstream fileObj(fileName,
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std::ios::in | std::ios::out | std::ios::binary);
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fileObj.exceptions(std::ios_base::failbit | std::ios_base::badbit);
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if (!fileObj.is_open()) {
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throw(FileOpenException(fileName));
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}
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int total;
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fileObj.seekp(-sizeof(int), std::ios::end);
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try {
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fileObj.read((char *)&total, sizeof(int));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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cout << "\033[1;34mThere are already " << total
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<< " teacher(s) recorded in this file.\033[0m" << endl;
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fileObj.seekp(sizeof(Teacher) * total);
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cout << "Start reading in new Teacher data. How many do you want to create?"
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<< endl;
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int newTeacherTotal, newTeacherCount = 1;
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newTeacherTotal = askValidInt();
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total += newTeacherTotal;
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while (newTeacherCount <= newTeacherTotal) {
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cout << "\033[1;32mNew teacher " << newTeacherCount << "/"
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<< newTeacherTotal << ":\033[0m" << endl;
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Teacher aTeacher(true);
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try {
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fileObj.write((char *)&aTeacher, sizeof(aTeacher));
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}
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catch (std::ios_base::failure) {
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throw(FileWriteException(fileName, readWrite));
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}
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cout << "Created " << newTeacherCount++ << " new teacher. (Total "
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<< newTeacherTotal << " new teachers)" << endl;
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}
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try {
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fileObj.write((char *)&total, sizeof(int));
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}
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catch (std::ios_base::failure) {
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throw(FileWriteException(fileName, readWrite));
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}
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fileObj.close();
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}
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void doChangeData() {
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std::string fileName;
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cout << "File name:" << flush;
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cin >> fileName;
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std::fstream fileObj(fileName,
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std::ios::in | std::ios::out | std::ios::binary);
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if (!fileObj.is_open()) {
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throw(FileOpenException(fileName));
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}
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int total;
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fileObj.seekg(-sizeof(int), std::ios::end);
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try {
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fileObj.read((char *)&total, sizeof(int));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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cout << "\033[1;34mThere are " << total
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<< " teacher(s) recorded in this file. Which one do you want to "
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"change?\033[0m"
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<< endl;
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int userSelect = 0;
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while (true) {
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userSelect = askValidInt();
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if (userSelect < 1 || userSelect > total) {
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cout << "Out of bounds. Try again: " << flush;
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continue;
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}
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break;
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}
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Teacher aTeacher;
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fileObj.seekg(sizeof(Teacher) * (userSelect - 1));
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try {
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fileObj.read((char *)&aTeacher, sizeof(Teacher));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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cin >> aTeacher;
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fileObj.seekg(sizeof(Teacher) * (userSelect - 1));
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try {
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fileObj.write((char *)&aTeacher, sizeof(Teacher));
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}
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catch (std::ios_base::failure) {
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throw(FileWriteException(fileName, readWrite));
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}
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fileObj.close();
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}
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void doSearchData() {
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std::string fileName;
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cout << "File name: " << flush;
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cin >> fileName;
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std::fstream fileObj(fileName, std::ios::in | std::ios::binary);
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if (!fileObj.is_open()) {
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throw(FileOpenException(fileName));
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}
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int total;
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fileObj.seekg(-sizeof(int), std::ios::end);
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try {
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fileObj.read((char *)&total, sizeof(int));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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Teacher *allTeachers = new Teacher[total];
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fileObj.seekg(0);
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try {
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fileObj.read((char *)allTeachers, total * sizeof(Teacher));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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fileObj.close();
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int targetTeacherNum, matchedTeacherTotal = 0;
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int *matchedIndexes = new int[total];
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cout << "Input your target teacher number: ";
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targetTeacherNum = askValidInt();
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for (int i = 0; i < total; i++) {
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if (allTeachers[i].getNumber() == targetTeacherNum) {
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matchedIndexes[matchedTeacherTotal++] = i;
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}
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}
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if (matchedTeacherTotal > 0) {
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cout << "\033[1;34mThere are a total of " << matchedTeacherTotal
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<< " teacher(s) matches your criteria.\033[0m" << endl;
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for (int i = 0; i < matchedTeacherTotal; i++) {
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cout << "\033[1;32mMatched teacher " << i + 1 << "/"
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<< matchedTeacherTotal
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<< " (Position in file: " << matchedIndexes[i] + 1
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<< "):\033[0m\n"
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<< allTeachers[matchedIndexes[i]];
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}
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cout << flush;
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}
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else {
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cout << "\033[1;34mNo teacher matched your criteria.\033[0m" << endl;
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}
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}
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void doDisplayAll() {
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std::string fileName;
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cout << "File name: " << flush;
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cin >> fileName;
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std::fstream fileObj(fileName, std::ios::in | std::ios::binary);
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if (!fileObj.is_open()) {
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throw(FileOpenException(fileName));
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}
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int total;
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fileObj.seekg(-sizeof(int), std::ios::end);
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try {
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fileObj.read((char *)&total, sizeof(int));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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Teacher *allTeachers = new Teacher[total];
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fileObj.seekg(0);
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try {
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fileObj.read((char *)allTeachers, total * sizeof(Teacher));
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}
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catch (std::ios_base::failure) {
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throw(FileReadException(fileName, readWrite));
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}
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fileObj.close();
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cout << "\033[1;34mThere are a total of " << total << " teacher(s).\033[0m"
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<< endl;
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for (int i = 0; i < total; i++) {
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cout << "\033[1;32mTeacher " << i + 1 << "/" << total << ":\033[0m\n"
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<< allTeachers[i];
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}
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cout << endl;
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delete[] allTeachers;
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};
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int main() {
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workmode mode;
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bool running = true;
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while (running) {
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mode = displayMainMenu();
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try {
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switch (mode) {
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case createFile:
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doCreateFile();
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break;
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case appendData:
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doAppendData();
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break;
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case changeData:
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doChangeData();
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break;
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case searchData:
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doSearchData();
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break;
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case displayAll:
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doDisplayAll();
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break;
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case quit:
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running = false;
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break;
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}
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}
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catch (FileOperationException &e) {
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e.displayDetailedInformation();
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cout << "Returning to main menu." << endl;
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}
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}
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return 0;
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} |