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46 lines
1.5 KiB
46 lines
1.5 KiB
3 years ago
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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package internal
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import (
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"fmt"
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"go.mongodb.org/mongo-driver/bson"
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)
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// StringSliceFromRawElement decodes the provided BSON element into a []string. This internally calls
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// StringSliceFromRawValue on the element's value. The error conditions outlined in that function's documentation
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// apply for this function as well.
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func StringSliceFromRawElement(element bson.RawElement) ([]string, error) {
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return StringSliceFromRawValue(element.Key(), element.Value())
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}
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// StringSliceFromRawValue decodes the provided BSON value into a []string. This function returns an error if the value
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// is not an array or any of the elements in the array are not strings. The name parameter is used to add context to
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// error messages.
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func StringSliceFromRawValue(name string, val bson.RawValue) ([]string, error) {
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arr, ok := val.ArrayOK()
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if !ok {
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return nil, fmt.Errorf("expected '%s' to be an array but it's a BSON %s", name, val.Type)
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}
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arrayValues, err := arr.Values()
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if err != nil {
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return nil, err
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}
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strs := make([]string, 0, len(arrayValues))
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for _, arrayVal := range arrayValues {
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str, ok := arrayVal.StringValueOK()
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if !ok {
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return nil, fmt.Errorf("expected '%s' to be an array of strings, but found a BSON %s", name, arrayVal.Type)
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}
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strs = append(strs, str)
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}
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return strs, nil
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}
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