diffusion/src/node_modules/topic-update/pending-validate-stream.js

Diffusion JavaScript client

var _implements = require('util/interface')._implements;
var api = require('../../topic-update/update-stream');
var TopicCreationResult = require('../../topic-update/topic-update').TopicCreationResult;

var Emitter = require('events/emitter');
var Result = require('events/result');

var PendingValidateAndSetStream = require('topic-update/pending-validate-and-set-stream');
var ValidatedStream = require('topic-update/validated-stream');
var InvalidUnsetStream = require('topic-update/invalid-unset-stream');

var PendingValidateStream = _implements(
    api.UpdateStream,
    function PendingValidateStream(streamServices, options, stream, pendingResult) {

        this.set = function(value) {
            options.checkOperation(value);
            var emitter = new Emitter();
            var result = new Result(emitter);

            stream.setDelegate(
                new PendingValidateAndSetStream(streamServices,
                                                options,
                                                stream,
                                                pendingResult,
                                                emitter,
                                                value)
            );

            return result;
        };

        this.get = function() {
            throw new Error("The set method has not been called");
        };

        this.validate = function() {
            var emitter = new Emitter();
            var result = new Result(emitter);

            pendingResult.then(function(r) {
                emitter.emit('complete', TopicCreationResult.EXISTS);
                return r;
            }, function(err) {
                emitter.error(err);
            });

            return result;
        };

        this.onSetComplete = function() {
            throw new Error("No set request has been sent");
        };

        this.onSetFailed = function() {
            throw new Error("No set request has been sent");
        };

        this.onValidateComplete = function(streamId) {
            stream.setDelegate(
                new ValidatedStream(streamServices, options, stream, streamId)
            );
        };

        this.onValidateFailed = function(err) {
            stream.setDelegate(new InvalidUnsetStream(err));
        };
    }
);

module.exports = PendingValidateStream;