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//! Models for collection-level batch operations.
use super::options::WriteModel;
use bson::{Bson, Document};
use std::convert::From;
#[derive(Debug)]
pub struct DeleteModel {
pub filter: Document,
pub multi: bool,
}
impl DeleteModel {
pub fn new(filter: Document, multi: bool) -> DeleteModel {
DeleteModel {
filter: filter,
multi: multi,
}
}
}
#[derive(Debug)]
pub struct UpdateModel {
pub filter: Document,
pub update: Document,
pub upsert: Option<bool>,
pub multi: bool,
}
impl UpdateModel {
pub fn new(filter: Document,
update: Document,
upsert: Option<bool>,
multi: bool)
-> UpdateModel {
UpdateModel {
filter: filter,
update: update,
upsert: upsert,
multi: multi,
}
}
}
impl From<UpdateModel> for Document {
fn from(model: UpdateModel) -> Self {
let mut document = doc! {
"q" => (model.filter),
"u" => (model.update)
};
if let Some(upsert) = model.upsert {
document.insert("upsert", Bson::Boolean(upsert));
}
if model.multi {
document.insert("multi", Bson::Boolean(true));
}
document
}
}
#[derive(Debug)]
pub enum Batch {
Insert(Vec<Document>),
Delete(Vec<DeleteModel>),
Update(Vec<UpdateModel>),
}
impl From<WriteModel> for Batch {
fn from(model: WriteModel) -> Batch {
match model {
WriteModel::InsertOne { document } => Batch::Insert(vec![document]),
WriteModel::DeleteOne { filter } => {
Batch::Delete(vec![DeleteModel {
filter: filter,
multi: false,
}])
}
WriteModel::DeleteMany { filter } => {
Batch::Delete(vec![DeleteModel {
filter: filter,
multi: true,
}])
}
WriteModel::ReplaceOne { filter, replacement: update, upsert } |
WriteModel::UpdateOne { filter, update, upsert } => {
Batch::Update(vec![UpdateModel {
filter: filter,
update: update,
upsert: upsert,
multi: false,
}])
}
WriteModel::UpdateMany { filter, update, upsert } => {
Batch::Update(vec![UpdateModel {
filter: filter,
update: update,
upsert: upsert,
multi: true,
}])
}
}
}
}
impl Batch {
pub fn len(&self) -> i64 {
let length = match *self {
Batch::Insert(ref v) => v.len(),
Batch::Delete(ref v) => v.len(),
Batch::Update(ref v) => v.len(),
};
length as i64
}
/// Attempts to merge another model into this batch.
///
/// # Arguments
///
/// `model` - The model to try to merge.
///
/// # Return value
///
/// Returns `None` on success, or the model that couldn't be merged on
/// failure.
pub fn merge_model(&mut self, model: WriteModel) -> Option<WriteModel> {
match *self {
Batch::Insert(ref mut docs) => {
match model {
WriteModel::InsertOne { document } => docs.push(document),
_ => return Some(model),
}
}
Batch::Delete(ref mut models) => {
match model {
WriteModel::DeleteOne { filter } => {
models.push(DeleteModel {
filter: filter,
multi: false,
})
}
WriteModel::DeleteMany { filter } => {
models.push(DeleteModel {
filter: filter,
multi: true,
})
}
_ => return Some(model),
}
}
Batch::Update(ref mut models) => {
match model {
WriteModel::ReplaceOne { filter, replacement: update, upsert } |
WriteModel::UpdateOne { filter, update, upsert } => {
models.push(UpdateModel {
filter: filter,
update: update,
upsert: upsert,
multi: false,
})
}
WriteModel::UpdateMany { filter, update, upsert } => {
models.push(UpdateModel {
filter: filter,
update: update,
upsert: upsert,
multi: true,
})
}
_ => return Some(model),
}
}
}
None
}
}