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54 lines
1.1 KiB
54 lines
1.1 KiB
/**
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* Manage access to data, be it to find, update or remove it
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*/
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var model = require('./model');
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/**
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* Create a new cursor for this collection
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* @param {Datastore} db - The datastore this cursor is bound to
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* @param {Query} query - The query this cursor will operate on
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*/
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function Cursor (db, query) {
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this.db = db;
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this.query = query;
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}
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/**
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* Set a limit the number of results
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*/
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Cursor.prototype.limit = function(limit) {
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this.limit = limit;
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};
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/**
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* Get all matching elements
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* @param {Function} callback - Signature: err, results
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*/
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Cursor.prototype.exec = function(callback) {
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var candidates = this.db.getCandidates(this.query)
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, res = [], added = 0
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, i
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;
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try {
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for (i = 0; i < candidates.length; i += 1) {
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if (model.match(candidates[i], this.query)) {
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res.push(model.deepCopy(candidates[i]));
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added += 1;
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if (this.limit && this.limit <= added) { break; }
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}
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}
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} catch (err) {
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return callback(err);
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}
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return callback(null, res);
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};
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// Interface
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module.exports = Cursor; |