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use std::collections::BTreeMap;
use std::collections::HashMap;
pub use versatile_data::{
Data
,IdxSized
};
pub use idx_binary::IdxBinary;
mod collection;
pub use collection::Collection;
mod relation;
pub use relation::{
CollectionRow
,RelationIndexes
};
mod transaction;
use transaction::Transaction;
pub use transaction::{
TransactionRecord
,UpdateOrNew
};
pub struct Database{
root_dir:String
,collections_map:HashMap<String,u32>
,collections:BTreeMap<u32,Collection>
,relation:RelationIndexes
}
impl Database{
pub fn new(dir:&str)->Database{
let root_dir=if dir.ends_with("/") || dir.ends_with("\\"){
let mut d=dir.to_string();
d.pop();
d
}else{
dir.to_string()
};
let db=if let (
Ok(relation_key_names)
,Ok(relation_key)
,Ok(relation_parent)
,Ok(relation_child)
)=(
IdxBinary::new(&(root_dir.to_string()+"/relation_key_name"))
,IdxSized::new(&(root_dir.to_string()+"/relation_key.i"))
,IdxSized::new(&(root_dir.to_string()+"/relation_parent.i"))
,IdxSized::new(&(root_dir.to_string()+"/relation_child.i"))
){
Some(Database{
root_dir
,collections:BTreeMap::new()
,collections_map:HashMap::new()
,relation:RelationIndexes::new(
relation_key_names
,relation_key
,relation_parent
,relation_child
)
})
}else{
None
};
db.expect("Fatal error: Can't Create/Open database")
}
fn collection_by_name_or_create(&mut self,name:&str)->u32{
let mut max_id=0;
let collections_dir=self.root_dir.to_string()+"/collection/";
if let Ok(dir)=std::fs::read_dir(&collections_dir){
for d in dir.into_iter(){
if let Ok(d)=d{
if let Ok(dt)=d.file_type(){
if dt.is_dir(){
if let Some(fname)=d.path().file_name(){
if let Some(fname)=fname.to_str(){
let s: Vec<&str>=fname.split("_").collect();
if s.len()>1{
if let Ok(i)=s[0].parse(){
max_id=std::cmp::max(max_id,i);
}
if s[1]==name{
if let Some(path)=d.path().to_str(){
if let Some(data)=Data::new(path){
self.collections_map.insert(name.to_string(),max_id);
self.collections.insert(
max_id
,Collection::new(max_id,data)
);
return max_id;
}
}
}
}
}
}
}
}
}
}
}
let collection_id=max_id+1;
if let Some(data)=Data::new(&(collections_dir+"/"+&collection_id.to_string()+"_"+name)){
self.collections_map.insert(name.to_string(),collection_id);
self.collections.insert(
collection_id
,Collection::new(collection_id,data)
);
}
collection_id
}
pub fn collection(&self,id:u32)->Option<&Collection>{
self.collections.get(&id)
}
pub fn collection_mut(&mut self,id:u32)->Option<&mut Collection>{
self.collections.get_mut(&id)
}
pub fn collection_id(&mut self,name:&str)->u32{
if !self.collections_map.contains_key(name){
self.collection_by_name_or_create(name)
}else{
if let Some(id)=self.collections_map.get(name){
*id
}else{
0
}
}
}
pub fn begin_transaction(&mut self)->Transaction{
Transaction::new(self)
}
pub fn data(&self,collection_id:u32)->Option<&Data>{
if let Some(collection)=self.collections.get(&collection_id){
Some(collection.data())
}else{
None
}
}
pub fn relation_mut(&mut self)->&mut RelationIndexes{
&mut self.relation
}
pub fn relation(&self)->&RelationIndexes{
&self.relation
}
pub fn childs(&self,parent:&CollectionRow){
self.relation.childs(parent);
}
}
