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deleteone.go
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deleteone.go
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// Copyright (C) MongoDB, Inc. 2017-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
package findopt
import (
"reflect"
"time"
"github.com/mongodb/mongo-go-driver/core/option"
"github.com/mongodb/mongo-go-driver/core/session"
"github.com/mongodb/mongo-go-driver/mongo/mongoopt"
)
var deleteOneBundle = new(DeleteOneBundle)
// DeleteOne represents all passable params for the deleteOne() function.
type DeleteOne interface {
deleteOne()
}
// DeleteOneOption represents the options for the deleteOne() function.
type DeleteOneOption interface {
DeleteOne
ConvertDeleteOneOption() option.FindOneAndDeleteOptioner
}
// DeleteOneSession is the session for the deleteOne() function
type DeleteOneSession interface {
DeleteOne
ConvertDeleteOneSession() *session.Client
}
// DeleteOneBundle is a bundle of FindOneAndDelete options
type DeleteOneBundle struct {
option DeleteOne
next *DeleteOneBundle
}
// BundleDeleteOne bundles FindOneAndDelete options
func BundleDeleteOne(opts ...DeleteOne) *DeleteOneBundle {
head := deleteOneBundle
for _, opt := range opts {
newBundle := DeleteOneBundle{
option: opt,
next: head,
}
head = &newBundle
}
return head
}
func (dob *DeleteOneBundle) deleteOne() {}
// ConvertDeleteOneOption implements the DeleteOne interface
func (dob *DeleteOneBundle) ConvertDeleteOneOption() option.FindOneAndDeleteOptioner { return nil }
// Collation adds an option to specify a Collation
func (dob *DeleteOneBundle) Collation(collation *mongoopt.Collation) *DeleteOneBundle {
bundle := &DeleteOneBundle{
option: Collation(collation),
next: dob,
}
return bundle
}
// MaxTime adds an option to specify the max time to allow the query to run.
func (dob *DeleteOneBundle) MaxTime(d time.Duration) *DeleteOneBundle {
bundle := &DeleteOneBundle{
option: MaxTime(d),
next: dob,
}
return bundle
}
// Projection adds an option to limit the fields returned for all documents.
func (dob *DeleteOneBundle) Projection(projection interface{}) *DeleteOneBundle {
bundle := &DeleteOneBundle{
option: Projection(projection),
next: dob,
}
return bundle
}
// Sort adds an option to specify the order in which to return results.
func (dob *DeleteOneBundle) Sort(sort interface{}) *DeleteOneBundle {
bundle := &DeleteOneBundle{
option: Sort(sort),
next: dob,
}
return bundle
}
// Unbundle unwinds and deduplicates the options used to create it and those
// added after creation into a single slice of options.
//
// The deduplicate parameter is used to determine if the bundle is just flattened or
// if we actually deduplicate options.
//
// Since a FindBundle can be recursive, this method will unwind all recursive FindBundles.
func (dob *DeleteOneBundle) Unbundle(deduplicate bool) ([]option.FindOneAndDeleteOptioner, *session.Client, error) {
options, sess, err := dob.unbundle()
if err != nil {
return nil, nil, err
}
if !deduplicate {
return options, sess, nil
}
// iterate backwards and make dedup slice
optionsSet := make(map[reflect.Type]struct{})
for i := len(options) - 1; i >= 0; i-- {
currOption := options[i]
optionType := reflect.TypeOf(currOption)
if _, ok := optionsSet[optionType]; ok {
// option already found
options = append(options[:i], options[i+1:]...)
continue
}
optionsSet[optionType] = struct{}{}
}
return options, sess, nil
}
// Calculates the total length of a bundle, acdeleteOneing for nested bundles.
func (dob *DeleteOneBundle) bundleLength() int {
if dob == nil {
return 0
}
bundleLen := 0
for ; dob != nil; dob = dob.next {
if dob.option == nil {
continue
}
if converted, ok := dob.option.(*DeleteOneBundle); ok {
// nested bundle
bundleLen += converted.bundleLength()
continue
}
if _, ok := dob.option.(DeleteOneSession); !ok {
bundleLen++
}
}
return bundleLen
}
// Helper that recursively unwraps bundle into slice of options
func (dob *DeleteOneBundle) unbundle() ([]option.FindOneAndDeleteOptioner, *session.Client, error) {
if dob == nil {
return nil, nil, nil
}
var sess *session.Client
listLen := dob.bundleLength()
options := make([]option.FindOneAndDeleteOptioner, listLen)
index := listLen - 1
for listHead := dob; listHead != nil; listHead = listHead.next {
if listHead.option == nil {
continue
}
// if the current option is a nested bundle, Unbundle it and add its options to the current array
if converted, ok := listHead.option.(*DeleteOneBundle); ok {
nestedOptions, s, err := converted.unbundle()
if err != nil {
return nil, nil, err
}
if s != nil && sess == nil {
sess = s
}
// where to start inserting nested options
startIndex := index - len(nestedOptions) + 1
// add nested options in order
for _, nestedOp := range nestedOptions {
options[startIndex] = nestedOp
startIndex++
}
index -= len(nestedOptions)
continue
}
switch t := listHead.option.(type) {
case DeleteOneOption:
options[index] = t.ConvertDeleteOneOption()
index--
case DeleteOneSession:
if sess == nil {
sess = t.ConvertDeleteOneSession()
}
}
}
return options, sess, nil
}
// String implements the Stringer interface
func (dob *DeleteOneBundle) String() string {
if dob == nil {
return ""
}
str := ""
for head := dob; head != nil && head.option != nil; head = head.next {
if converted, ok := head.option.(*DeleteOneBundle); ok {
str += converted.String()
continue
}
if conv, ok := head.option.(DeleteOneOption); !ok {
str += conv.ConvertDeleteOneOption().String() + "\n"
}
}
return str
}