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62 lines
1.3 KiB
62 lines
1.3 KiB
'use strict';
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/**
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* The **ReadConcern** class is a class that represents a MongoDB ReadConcern.
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* @class
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* @property {string} level The read concern level
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* @see https://docs.mongodb.com/manual/reference/read-concern/index.html
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*/
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class ReadConcern {
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/**
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* Constructs a ReadConcern from the read concern properties.
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* @param {string} [level] The read concern level ({'local'|'available'|'majority'|'linearizable'|'snapshot'})
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*/
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constructor(level) {
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if (level != null) {
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this.level = level;
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}
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}
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/**
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* Construct a ReadConcern given an options object.
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*
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* @param {object} options The options object from which to extract the write concern.
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* @return {ReadConcern}
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*/
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static fromOptions(options) {
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if (options == null) {
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return;
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}
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if (options.readConcern) {
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if (options.readConcern instanceof ReadConcern) {
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return options.readConcern;
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}
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return new ReadConcern(options.readConcern.level);
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}
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if (options.level) {
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return new ReadConcern(options.level);
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}
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}
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static get MAJORITY() {
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return 'majority';
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}
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static get AVAILABLE() {
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return 'available';
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}
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static get LINEARIZABLE() {
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return 'linearizable';
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}
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static get SNAPSHOT() {
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return 'snapshot';
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}
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}
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module.exports = ReadConcern;
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