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use crate::*;
use hashbrown::{HashMap, HashSet};
use std::rc::Rc;
use std::cell::RefCell;
use std::fmt;
#[derive(Clone, Serialize, Deserialize)]
pub enum Change {
Set((u64, Vec<(TableIndex, TableIndex, Value)>)),
NewTable{table_id: u64, rows: usize, columns: usize},
ColumnAlias{table_id: u64, column_ix: usize, column_alias: u64},
ColumnKind{table_id: u64, column_ix: usize, column_kind: ValueKind},
}
impl fmt::Debug for Change {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Change::Set((table_id,args)) => write!(f,"Set({},{:#?})",humanize(table_id),args)?,
Change::NewTable{table_id,rows,columns} => write!(f,"NewTable({},{:?},{:?})",humanize(table_id),rows,columns)?,
Change::ColumnAlias{table_id,column_ix,column_alias} => write!(f,"ColumnAlias({},{:?},{})",humanize(table_id),column_ix,humanize(column_alias))?,
Change::ColumnKind{table_id,column_ix,column_kind} => write!(f,"ColumnKind({},{:?},{:?})",humanize(table_id),column_ix,column_kind)?,
}
Ok(())
}
}
pub type Transaction = Vec<Change>;
#[derive(Clone)]
pub struct Database {
pub dynamic_tables: HashSet<(TableId,RegisterIndex,RegisterIndex)>,
pub tables: HashMap<u64,Rc<RefCell<Table>>>,
pub table_alias_to_id: HashMap<u64,TableId>,
}
impl Database {
pub fn new() -> Database {
Database {
dynamic_tables: HashSet::new(),
tables: HashMap::new(),
table_alias_to_id: HashMap::new(),
}
}
pub fn clear(&mut self) {
self.dynamic_tables.clear();
self.tables.clear();
self.table_alias_to_id.clear();
}
pub fn union(&mut self, other: &Self) -> Result<(),MechError> {
let mut other_tables = other.tables.clone();
for (id,other_table) in other_tables.drain() {
match self.tables.try_insert(id, other_table.clone()) {
Ok(_) => (),
Err(x) => {return Err(MechError{msg: "".to_string(), id: 1723, kind: MechErrorKind::None});},
}
}
let mut other_table_aliases = other.table_alias_to_id.clone();
for (id,other_table) in other_table_aliases.drain() {
match self.table_alias_to_id.try_insert(id, other_table.clone()) {
Ok(_) => (),
Err(x) => {return Err(MechError{msg: "".to_string(), id: 1724, kind: MechErrorKind::None});},
}
}
Ok(())
}
pub fn insert_alias(&mut self, alias: u64, table_id: TableId) -> Result<TableId,MechError> {
match self.table_alias_to_id.try_insert(alias, table_id) {
Err(x) => {return Err(MechError{msg: "".to_string(), id: 1725, kind: MechErrorKind::DuplicateAlias(*table_id.unwrap())});},
Ok(x) => Ok(*x),
}
}
pub fn insert_table(&mut self, table: Table) -> Result<Rc<RefCell<Table>>,MechError> {
match self.tables.try_insert(table.id, Rc::new(RefCell::new(table))) {
Ok(x) => Ok(x.clone()),
Err(x) => {return Err(MechError{msg: "".to_string(), id: 1726, kind: MechErrorKind::None});},
}
}
pub fn overwrite_table(&mut self, table: Table) -> Result<Rc<RefCell<Table>>,MechError> {
match self.tables.insert(table.id, Rc::new(RefCell::new(table))) {
Some(x) => Ok(x.clone()),
None => {return Err(MechError{msg: "".to_string(), id: 1726, kind: MechErrorKind::None});},
}
}
pub fn insert_table_ref(&mut self, table: TableRef) -> Result<Rc<RefCell<Table>>,MechError> {
let table_id = {
let table_brrw = table.borrow();
table_brrw.id
};
match self.tables.try_insert(table_id, table) {
Ok(x) => Ok(x.clone()),
Err(x) => {return Err(MechError{msg: "".to_string(), id: 1726, kind: MechErrorKind::None});},
}
}
pub fn get_table(&self, table_name: &str) -> Option<&Rc<RefCell<Table>>> {
let alias = hash_str(table_name);
match self.table_alias_to_id.get(&alias) {
Some(table_id) => {
self.tables.get(table_id.unwrap())
}
_ => self.tables.get(&alias),
}
}
pub fn get_table_by_id(&self, table_id: &u64) -> Option<&Rc<RefCell<Table>>> {
match self.tables.get(table_id) {
None => {
match self.table_alias_to_id.get(table_id) {
None => None,
Some(table_id) => {
self.tables.get(table_id.unwrap())
}
}
}
x => x
}
}
pub fn get_table_by_id_mut(&self, table_id: u64) -> Option<&Rc<RefCell<Table>>> {
let table_id = match self.tables.contains_key(&table_id) {
true => table_id,
false => match self.table_alias_to_id.get(&table_id) {
Some(table_id) => *table_id.unwrap(),
None => return None,
}
};
self.tables.get(&table_id)
}
}
impl fmt::Debug for Database {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut db_drawing = BoxPrinter::new();
db_drawing.add_header("tables");
for table in self.tables.values() {
db_drawing.add_line(format!("{:?}", table.borrow()));
}
if self.table_alias_to_id.len() > 0 {
db_drawing.add_header("table alias → table id");
for (alias,id) in self.table_alias_to_id.iter() {
db_drawing.add_line(format!("{} → {:?}", humanize(alias), id));
}
}
write!(f,"{:?}",db_drawing)?;
Ok(())
}
}