'use strict';
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const handleCallback = require('../utils').handleCallback;
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const OperationBase = require('./operation').OperationBase;
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const toError = require('../utils').toError;
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class FindOneOperation extends OperationBase {
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constructor(collection, query, options) {
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super(options);
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this.collection = collection;
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this.query = query;
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}
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execute(callback) {
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const coll = this.collection;
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const query = this.query;
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const options = this.options;
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const cursor = coll
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.find(query, options)
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.limit(-1)
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.batchSize(1);
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// Return the item
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cursor.next((err, item) => {
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if (err != null) return handleCallback(callback, toError(err), null);
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handleCallback(callback, null, item);
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});
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}
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}
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module.exports = FindOneOperation;
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