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UserDatabase.cpp
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UserDatabase.cpp
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#include "UserDatabase.h"
#include "User.h"
#include <string>
#include <vector>
#include <fstream>
#include <iostream>
using namespace std;
UserDatabase::UserDatabase() {}
UserDatabase::~UserDatabase() {
vector<string>::iterator it = m_allUserEmails.begin();
while (it != m_allUserEmails.end()) {
User* ptr = get_user_from_email(*it);
delete ptr;
it = m_allUserEmails.erase(it);
}
}
bool UserDatabase::load(const string& filename) {
ifstream infile(filename);
if (!infile)
return false;
// keeps track of what element corresponds to what
bool isName = true;
bool isEmail = false, isWatchHistoryLength = false, isBlank = true;
int movies = 0;
string name;
string email;
vector<string> watchHistory;
string s;
while(getline(infile, s)) {
// inserts lines into corresponding elements
if (isName) {
name = s;
isName = false;
isEmail = true;
} else if (isEmail) {
email = s;
isEmail = false;
isWatchHistoryLength = true;
} else if (isWatchHistoryLength) {
movies = stoi(s);
isWatchHistoryLength = false;
} else if (movies > 1) {
watchHistory.push_back(s);
movies--;
} else if (movies == 1) {
watchHistory.push_back(s);
m_UDB.insert(email, new User(name, email, watchHistory));
m_allUserEmails.push_back(email);
for(vector<string>::iterator it = watchHistory.begin(); it != watchHistory.end(); )
it = watchHistory.erase(it);
movies--;
isBlank = true;
} else if (isBlank) {
isName = true;
}
}
return true;
}
User* UserDatabase::get_user_from_email(const string& email) const {
TreeMultimap<string, User*>::Iterator it = m_UDB.find(email);
if (!it.is_valid())
return nullptr;
return it.get_value();
}