dd92ee853f
The library will need databases that have unique values (such as the artist or album tables). This patch adds support for that in my existing database code. Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>
131 lines
2.2 KiB
C++
131 lines
2.2 KiB
C++
/*
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* Copyright 2013 (c) Anna Schumaker.
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*
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* DO NOT INCLUDE THIS FILE DIRECTLY. THIS IS A TEMPLATE DEFINITION FILE
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* AND ONLY MEANT TO BE INCLUDED BY include/database.h!
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*/
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#ifndef OCARINA_DATABASE_HPP
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#define OCARINA_DATABASE_HPP
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template <class T>
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Database<T> :: Database(std::string filepath, DatabaseFlags f)
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: _size(0), file(filepath, FILE_TYPE_DATA), flags(f)
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{
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}
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template <class T>
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Database<T> :: ~Database()
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{
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}
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template <class T>
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void Database<T> :: save()
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{
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if (file.open(OPEN_WRITE) == false)
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return;
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file << db.size() << std::endl;
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for (unsigned int i = 0; i < db.size(); i++) {
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file << db[i].valid << " ";
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if (db[i].valid == true)
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db[i].write(file);
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file << std::endl;
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}
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file.close();
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}
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template <class T>
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void Database<T> :: load()
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{
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unsigned int db_size;
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if (file.open(OPEN_READ) == false)
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return;
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file >> db_size;
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db.resize(db_size);
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for (unsigned int i = 0; i < db_size; i++) {
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file >> db[i].valid;
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if (db[i].valid == true) {
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db[i].read(file);
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_size++;
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}
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}
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file.close();
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}
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template <class T>
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unsigned int Database<T> :: insert(T val)
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{
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if (flags == DB_UNIQUE) {
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for (unsigned int i = first(); i < size(); i = next(i)) {
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if (val == db[i])
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return i;
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}
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}
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db.push_back(val);
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_size++;
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return db.size() - 1;
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}
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template <class T>
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void Database<T> :: remove(unsigned int id)
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{
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db[id].valid = false;
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_size--;
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}
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template <class T>
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unsigned int Database<T> :: size()
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{
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return _size;
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}
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template <class T>
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unsigned int Database<T> :: num_rows()
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{
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return db.size();
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}
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template <class T>
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unsigned int Database<T> :: first()
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{
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for (unsigned int i = 0; i < db.size(); i++) {
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if (db[i].valid == true)
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return i;
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}
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return db.size();
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}
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template <class T>
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unsigned int Database<T> :: last()
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{
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for (unsigned int i = db.size() - 1; i >= 0; i--) {
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if (db[i].valid == true)
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return i;
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}
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return db.size();
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}
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template <class T>
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unsigned int Database<T> :: next(unsigned int id)
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{
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for (unsigned int i = id + 1; i < db.size(); i++) {
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if (db[i].valid == true)
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return i;
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}
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return db.size();
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}
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template <class T>
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T &Database<T> :: operator[](unsigned int id)
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{
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return db[id];
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}
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#endif /* OCARINA_DATABASE_HPP */
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