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databasetreeitems.rs
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databasetreeitems.rs
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use crate::Database;
use crate::{error::Result, treeitems_iter::TreeItemsIterator};
use crate::{item::DatabaseTreeItemKind, DatabaseTreeItem};
use std::{
collections::{BTreeSet, HashMap},
usize,
};
#[derive(Default)]
pub struct DatabaseTreeItems {
pub tree_items: Vec<DatabaseTreeItem>,
}
impl DatabaseTreeItems {
///
pub fn new(list: &[Database], collapsed: &BTreeSet<&String>) -> Result<Self> {
Ok(Self {
tree_items: Self::create_items(list, collapsed)?,
})
}
pub fn filter(&self, filter_text: String) -> Self {
Self {
tree_items: self
.tree_items
.iter()
.filter(|item| item.is_database() || item.is_match(&filter_text))
.map(|item| {
if item.is_database() {
let mut item = item.clone();
item.set_collapsed(false);
item
} else {
let mut item = item.clone();
item.show();
item
}
})
.collect::<Vec<DatabaseTreeItem>>(),
}
}
fn create_items(
list: &[Database],
collapsed: &BTreeSet<&String>,
) -> Result<Vec<DatabaseTreeItem>> {
let mut items = Vec::with_capacity(list.len());
let mut items_added: HashMap<String, usize> = HashMap::with_capacity(list.len());
for e in list {
{
Self::push_databases(e, &mut items, &mut items_added, collapsed)?;
}
for table in &e.tables {
items.push(DatabaseTreeItem::new_table(e, table)?);
}
}
Ok(items)
}
/// how many individual items are in the list
pub fn len(&self) -> usize {
self.tree_items.len()
}
/// iterates visible elements
pub const fn iterate(&self, start: usize, max_amount: usize) -> TreeItemsIterator<'_> {
TreeItemsIterator::new(self, start, max_amount)
}
fn push_databases<'a>(
database: &'a Database,
nodes: &mut Vec<DatabaseTreeItem>,
items_added: &mut HashMap<String, usize>,
collapsed: &BTreeSet<&String>,
) -> Result<()> {
let c = database.name.clone();
if !items_added.contains_key(&c) {
// add node and set count to have no children
items_added.insert(c.clone(), 0);
// increase the number of children in the parent node count
*items_added.entry(database.name.clone()).or_insert(0) += 1;
let is_collapsed = collapsed.contains(&c);
nodes.push(DatabaseTreeItem::new_database(database, is_collapsed)?);
}
// increase child count in parent node (the above ancenstor ignores the leaf component)
*items_added.entry(database.name.clone()).or_insert(0) += 1;
Ok(())
}
pub fn collapse(&mut self, index: usize, recursive: bool) {
if self.tree_items[index].kind().is_database() {
self.tree_items[index].collapse_database();
let name = self.tree_items[index].kind().name();
for i in index + 1..self.tree_items.len() {
let item = &mut self.tree_items[i];
if recursive && item.kind().is_database() {
item.collapse_database();
}
if let Some(db) = item.kind().database_name() {
if db == name {
item.hide();
}
} else {
return;
}
}
}
}
pub fn expand(&mut self, index: usize, recursive: bool) {
if self.tree_items[index].kind().is_database() {
self.tree_items[index].expand_database();
let name = self.tree_items[index].kind().name();
if recursive {
for i in index + 1..self.tree_items.len() {
let item = &mut self.tree_items[i];
if let Some(db) = item.kind().database_name() {
if *db != name {
break;
}
}
if item.kind().is_database() && item.kind().is_database_collapsed() {
item.expand_database();
}
}
}
self.update_visibility(&Some(name), index + 1, false);
}
}
fn update_visibility(&mut self, prefix: &Option<String>, start_idx: usize, set_defaults: bool) {
let mut inner_collapsed: Option<String> = None;
for i in start_idx..self.tree_items.len() {
if let Some(ref collapsed_item) = inner_collapsed {
if let Some(db) = self.tree_items[i].kind().database_name().clone() {
if db == *collapsed_item {
if set_defaults {
self.tree_items[i].info_mut().set_visible(false);
}
continue;
}
}
inner_collapsed = None;
}
let item_kind = self.tree_items[i].kind().clone();
if matches!(item_kind, DatabaseTreeItemKind::Database{ collapsed, .. } if collapsed) {
inner_collapsed = item_kind.database_name().clone();
}
if let Some(db) = item_kind.database_name() {
if prefix.as_ref().map_or(true, |prefix| *prefix == *db) {
self.tree_items[i].info_mut().set_visible(true);
}
} else {
// if we do not set defaults we can early out
if set_defaults {
self.tree_items[i].info_mut().set_visible(false);
} else {
return;
}
}
}
}
}