| 1 | /*
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| 2 | * Copyright (c) 2018 One Hill Technologies, LLC
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| 3 | *
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| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
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| 5 | * you may not use this file except in compliance with the License.
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| 6 | * You may obtain a copy of the License at
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| 7 | *
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| 8 | * http://www.apache.org/licenses/LICENSE-2.0
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| 9 | *
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| 10 | * Unless required by applicable law or agreed to in writing, software
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| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
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| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 13 | * See the License for the specific language governing permissions and
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| 14 | * limitations under the License.
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| 15 | */
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| 16 |
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| 17 | const Action = require ('./action');
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| 18 | const assert = require ('assert');
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| 19 |
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| 20 | /**
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| 21 | * @class ViewAction
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| 22 | *
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| 23 | * A ViewAction is an action that generates a view based on the content
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| 24 | * of the request it is processing.
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| 25 | */
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| 26 | module.exports = Action.extend ({
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| 27 | init () {
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| 28 | this._super.call (this, ...arguments);
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| 29 |
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| 30 | assert (!!this.view, "The 'view(req)' method must be defined by the subclass.");
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| 31 | },
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| 32 |
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| 33 | /**
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| 34 | * Get the view template for the action. The view is used to render a
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| 35 | * response to the caller.
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| 36 | *
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| 37 | * @params req The request object
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| 38 | * @returns {String|Promise}
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| 39 | */
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| 40 | view: null,
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| 41 |
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| 42 | /**
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| 43 | * Get the data model used to populate the template.
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| 44 | *
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| 45 | * @params req The request object
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| 46 | * @returns Promise
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| 47 | */
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| 48 | model (req) {
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| 49 | return null;
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| 50 | },
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| 51 |
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| 52 | /**
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| 53 | *
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| 54 | * @param req The request object
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| 55 | * @param res The response object
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| 56 | * @returns {Promise}
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| 57 | */
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| 58 | execute (req, res) {
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| 59 | // Get the new and the model from the subclass.
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| 60 | let vp = this.view (req);
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| 61 | let mp = this.model (req);
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| 62 |
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| 63 | return Promise.all ([vp,mp]).then (results => {
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| 64 | let [view, model] = results;
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| 65 |
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| 66 | res.render (view, model);
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| 67 | });
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| 68 | }
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| 69 | });
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