| // 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 options |
| |
| import "time" |
| |
| // DistinctOptions represents all possible options to the distinct() function |
| type DistinctOptions struct { |
| Collation *Collation // Specifies a collation |
| MaxTime *time.Duration // The maximum amount of time to allow the operation to run |
| } |
| |
| // Distinct returns a pointer to a new DistinctOptions |
| func Distinct() *DistinctOptions { |
| return &DistinctOptions{} |
| } |
| |
| // SetCollation specifies a collation |
| // Valid for server versions >= 3.4 |
| func (do *DistinctOptions) SetCollation(c *Collation) *DistinctOptions { |
| do.Collation = c |
| return do |
| } |
| |
| // SetMaxTime specifies the maximum amount of time to allow the operation to run |
| func (do *DistinctOptions) SetMaxTime(d time.Duration) *DistinctOptions { |
| do.MaxTime = &d |
| return do |
| } |
| |
| // MergeDistinctOptions combines the argued DistinctOptions into a single DistinctOptions in a last-one-wins fashion |
| func MergeDistinctOptions(opts ...*DistinctOptions) *DistinctOptions { |
| distinctOpts := Distinct() |
| for _, do := range opts { |
| if do == nil { |
| continue |
| } |
| if do.Collation != nil { |
| distinctOpts.Collation = do.Collation |
| } |
| if do.MaxTime != nil { |
| distinctOpts.MaxTime = do.MaxTime |
| } |
| } |
| |
| return distinctOpts |
| } |