forked from mongodb/mongo-go-driver
/
count.go
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/
count.go
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// Copyright (C) MongoDB, Inc. 2019-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
// Code generated by operationgen. DO NOT EDIT.
package operation
import (
"context"
"errors"
"fmt"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/mongo/readconcern"
"go.mongodb.org/mongo-driver/mongo/readpref"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/description"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
)
// Performs a count operation
type Count struct {
maxTimeMS *int64
query bsoncore.Document
session *session.Client
clock *session.ClusterClock
collection string
monitor *event.CommandMonitor
crypt *driver.Crypt
database string
deployment driver.Deployment
readConcern *readconcern.ReadConcern
readPreference *readpref.ReadPref
selector description.ServerSelector
retry *driver.RetryMode
result CountResult
}
type CountResult struct {
// The number of documents found
N int64
}
func buildCountResult(response bsoncore.Document, srvr driver.Server) (CountResult, error) {
elements, err := response.Elements()
if err != nil {
return CountResult{}, err
}
cr := CountResult{}
for _, element := range elements {
switch element.Key() {
case "n":
var ok bool
cr.N, ok = element.Value().AsInt64OK()
if !ok {
err = fmt.Errorf("response field 'n' is type int64, but received BSON type %s", element.Value().Type)
}
}
}
return cr, nil
}
// NewCount constructs and returns a new Count.
func NewCount() *Count {
return &Count{}
}
// Result returns the result of executing this operation.
func (c *Count) Result() CountResult { return c.result }
func (c *Count) processResponse(response bsoncore.Document, srvr driver.Server, desc description.Server) error {
var err error
c.result, err = buildCountResult(response, srvr)
return err
}
// Execute runs this operations and returns an error if the operaiton did not execute successfully.
func (c *Count) Execute(ctx context.Context) error {
if c.deployment == nil {
return errors.New("the Count operation must have a Deployment set before Execute can be called")
}
return driver.Operation{
CommandFn: c.command,
ProcessResponseFn: c.processResponse,
RetryMode: c.retry,
Type: driver.Read,
Client: c.session,
Clock: c.clock,
CommandMonitor: c.monitor,
Crypt: c.crypt,
Database: c.database,
Deployment: c.deployment,
ReadConcern: c.readConcern,
ReadPreference: c.readPreference,
Selector: c.selector,
}.Execute(ctx, nil)
}
func (c *Count) command(dst []byte, desc description.SelectedServer) ([]byte, error) {
dst = bsoncore.AppendStringElement(dst, "count", c.collection)
if c.maxTimeMS != nil {
dst = bsoncore.AppendInt64Element(dst, "maxTimeMS", *c.maxTimeMS)
}
if c.query != nil {
dst = bsoncore.AppendDocumentElement(dst, "query", c.query)
}
return dst, nil
}
// MaxTimeMS specifies the maximum amount of time to allow the query to run.
func (c *Count) MaxTimeMS(maxTimeMS int64) *Count {
if c == nil {
c = new(Count)
}
c.maxTimeMS = &maxTimeMS
return c
}
// Query determines what results are returned from find.
func (c *Count) Query(query bsoncore.Document) *Count {
if c == nil {
c = new(Count)
}
c.query = query
return c
}
// Session sets the session for this operation.
func (c *Count) Session(session *session.Client) *Count {
if c == nil {
c = new(Count)
}
c.session = session
return c
}
// ClusterClock sets the cluster clock for this operation.
func (c *Count) ClusterClock(clock *session.ClusterClock) *Count {
if c == nil {
c = new(Count)
}
c.clock = clock
return c
}
// Collection sets the collection that this command will run against.
func (c *Count) Collection(collection string) *Count {
if c == nil {
c = new(Count)
}
c.collection = collection
return c
}
// CommandMonitor sets the monitor to use for APM events.
func (c *Count) CommandMonitor(monitor *event.CommandMonitor) *Count {
if c == nil {
c = new(Count)
}
c.monitor = monitor
return c
}
// Crypt sets the Crypt object to use for automatic encryption and decryption.
func (c *Count) Crypt(crypt *driver.Crypt) *Count {
if c == nil {
c = new(Count)
}
c.crypt = crypt
return c
}
// Database sets the database to run this operation against.
func (c *Count) Database(database string) *Count {
if c == nil {
c = new(Count)
}
c.database = database
return c
}
// Deployment sets the deployment to use for this operation.
func (c *Count) Deployment(deployment driver.Deployment) *Count {
if c == nil {
c = new(Count)
}
c.deployment = deployment
return c
}
// ReadConcern specifies the read concern for this operation.
func (c *Count) ReadConcern(readConcern *readconcern.ReadConcern) *Count {
if c == nil {
c = new(Count)
}
c.readConcern = readConcern
return c
}
// ReadPreference set the read prefernce used with this operation.
func (c *Count) ReadPreference(readPreference *readpref.ReadPref) *Count {
if c == nil {
c = new(Count)
}
c.readPreference = readPreference
return c
}
// ServerSelector sets the selector used to retrieve a server.
func (c *Count) ServerSelector(selector description.ServerSelector) *Count {
if c == nil {
c = new(Count)
}
c.selector = selector
return c
}
// Retry enables retryable mode for this operation. Retries are handled automatically in driver.Operation.Execute based
// on how the operation is set.
func (c *Count) Retry(retry driver.RetryMode) *Count {
if c == nil {
c = new(Count)
}
c.retry = &retry
return c
}