livecodingspace-app/support/client/lib/vwf/model/aframe.js

"use strict";

// VWF & A-Frame model driver
// Copyright 2017 Krestianstvo.org project
//
// Copyright 2012 United States Government, as represented by the Secretary of Defense, Under
// Secretary of Defense (Personnel & Readiness).
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
// 
//   http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the License
// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
// or implied. See the License for the specific language governing permissions and limitations under
// the License.

/// vwf/model/scenejs.js is a placeholder for a 3-D scene manager.
/// 
/// @module vwf/model/aframe
/// @requires vwf/model

define(["module", "vwf/model", "vwf/utility"], function (module, model, utility) {
    var self;

    return model.load(module, {

        // == Module Definition ====================================================================

        // -- initialize ---------------------------------------------------------------------------

        initialize: function () {

            self = this;

            this.state = {
                nodes: {},
                scenes: {},
                prototypes: {},
                createLocalNode: function (nodeID, childID, childExtendsID, childImplementsIDs,
                    childSource, childType, childIndex, childName, callback) {
                    return {
                        "parentID": nodeID,
                        "ID": childID,
                        "extendsID": childExtendsID,
                        "implementsIDs": childImplementsIDs,
                        "source": childSource,
                        "type": childType,
                        "name": childName,
                        "prototypes": undefined,
                        "aframeObj": undefined,
                        "scene": undefined,
                        "componentName": undefined,
                        "events": {
                            "clickable": false
                        }
                    };
                },
                isAFrameClass: function (prototypes, classID) {
                    if (prototypes) {
                        for (var i = 0; i < prototypes.length; i++) {
                            if (prototypes[i] === classID) {
                                //console.info( "prototypes[ i ]: " + prototypes[ i ] );
                                return true;
                            }
                        }
                    }
                    return false;
                },
                isAFrameComponent: function (prototypes) {
                    var found = false;
                    if (prototypes) {
                        for (var i = 0; i < prototypes.length && !found; i++) {
                            found = (prototypes[i] === "http://vwf.example.com/aframe/node.vwf");
                        }
                    }
                    return found;
                },
                setAFrameProperty: function (propertyName, propertyValue, aframeObject) {
                    
                            if (propertyValue.hasOwnProperty('x')) {
                                aframeObject.setAttribute(propertyName, propertyValue)
                            } else
                                if (Array.isArray(propertyValue)) {
                                    aframeObject.setAttribute(propertyName, { x: propertyValue[0], y: propertyValue[1], z: propertyValue[2] })
                                } else if (typeof propertyValue === 'string') {
                                    aframeObject.setAttribute(propertyName, AFRAME.utils.coordinates.parse(propertyValue))
                                }
                    
                        }
            };

            this.state.kernel = this.kernel.kernel.kernel;
        },

        // == Model API ============================================================================

        // -- creatingNode -------------------------------------------------------------------------

        creatingNode: function (nodeID, childID, childExtendsID, childImplementsIDs,
            childSource, childType, childIndex, childName, callback /* ( ready ) */) {

            // If the parent nodeID is 0, this node is attached directly to the root and is therefore either 
            // the scene or a prototype.  In either of those cases, save the uri of the new node
            var childURI = (nodeID === 0 ? childIndex : undefined);
            var appID = this.kernel.application();

            // If the node being created is a prototype, construct it and add it to the array of prototypes,
            // and then return
            var prototypeID = utility.ifPrototypeGetId(appID, this.state.prototypes, nodeID, childID);
            if (prototypeID !== undefined) {

                this.state.prototypes[prototypeID] = {
                    parentID: nodeID,
                    ID: childID,
                    extendsID: childExtendsID,
                    implementsID: childImplementsIDs,
                    source: childSource,
                    type: childType,
                    name: childName
                };
                return;
            }

            var protos = getPrototypes(this.kernel, childExtendsID);
            //var kernel = this.kernel.kernel.kernel;
            var node;

            if (this.state.isAFrameComponent(protos)) {

                // Create the local copy of the node properties
                if (this.state.nodes[childID] === undefined) {
                    this.state.nodes[childID] = this.state.createLocalNode(nodeID, childID, childExtendsID, childImplementsIDs,
                        childSource, childType, childIndex, childName, callback);
                }

                node = this.state.nodes[childID];
                node.prototypes = protos;

                // if (childType == "component") {
                //     if (nodeID !== undefined) {
                //         node.aframeObj =  setAFrameObjectComponents(node);
                //         addNodeToHierarchy(node);
                //     }
                // } else {

                node.aframeObj = createAFrameObject(node);
                addNodeToHierarchy(node);

                //notifyDriverOfPrototypeAndBehaviorProps();
                //  }

                //addNodeToHierarchy(node);
            }



        },

        // initializingNode: function( nodeID, childID, childExtendsID, childImplementsIDs,
        //     childSource, childType, childIndex, childName ) {
        //     var node = this.state.nodes[childID];


        //     if ( node && childType == "component" ) {

        //     }
        // },

        // -- initializingProperty -----------------------------------------------------------------

        initializingProperty: function (nodeID, propertyName, propertyValue) {

            var value = undefined;
            var node = this.state.nodes[nodeID];
            if (node !== undefined) {
                value = this.settingProperty(nodeID, propertyName, propertyValue);
            }
            return value;
        },

        // -- creatingProperty ---------------------------------------------------------------------

        creatingProperty: function (nodeID, propertyName, propertyValue) {

            return this.initializingProperty(nodeID, propertyName, propertyValue);
        },



        // -- deletingNode -------------------------------------------------------------------------

        //deletingNode: function( nodeID ) {
        //},

        // -- deletingNode -------------------------------------------------------------------------

        deletingNode: function (nodeID) {

            if (this.state.nodes[nodeID] !== undefined) {

                var node = this.state.nodes[nodeID];
                if (node.aframeObj !== undefined) {
                    // removes and destroys object
                    node.aframeObj.parentNode.removeChild(node.aframeObj);
                    node.aframeObj = undefined;
                }

                delete this.state.nodes[nodeID];
            }

        },



        // -- settingProperty ----------------------------------------------------------------------

        settingProperty: function (nodeID, propertyName, propertyValue) {

            var node = this.state.nodes[nodeID];
            var value = undefined;

            //    if (node.componentName == 'line') {
            //        console.log(node.aframeObj);
            //    }

            if (node && node.aframeObj && utility.validObject(propertyValue)) {

                var aframeObject = node.aframeObj;

                if (isNodeDefinition(node.prototypes)) {

                    // 'id' will be set to the nodeID
                    value = propertyValue;
                    switch (propertyName) {

                        default:
                            value = undefined;
                            break;
                    }

                }


                if (value === undefined && isAEntityDefinition(node.prototypes)) {

                    value = propertyValue;

                    switch (propertyName) {

                        // case "interpolation":
                        //     aframeObject.setAttribute('interpolation', { duration: propertyValue});
                        //         break;

                        case "position":

                        this.state.setAFrameProperty('position', propertyValue, aframeObject);
                            // if (propertyValue.hasOwnProperty('x')) {
                            //     aframeObject.setAttribute('position', propertyValue)
                            // } else
                            //     if (Array.isArray(propertyValue)) {
                            //         aframeObject.setAttribute('position', { x: propertyValue[0], y: propertyValue[1], z: propertyValue[2] })
                            //     } else if (typeof propertyValue === 'string') {
                            //         aframeObject.setAttribute('position', AFRAME.utils.coordinates.parse(propertyValue))
                            //     }

                            break;
                        case "rotation":
                        this.state.setAFrameProperty('rotation', propertyValue, aframeObject);
                            // if (Array.isArray(propertyValue)) {
                            //     aframeObject.setAttribute('rotation', { x: propertyValue[0], y: propertyValue[1], z: propertyValue[2] });
                            // } else {
                            //     aframeObject.setAttribute('rotation', AFRAME.utils.coordinates.parse(propertyValue));
                            // }
                            break;
                        case "scale":
                        this.state.setAFrameProperty('scale', propertyValue, aframeObject);
                            // if (Array.isArray(propertyValue)) {
                            //     aframeObject.setAttribute('scale', { x: propertyValue[0], y: propertyValue[1], z: propertyValue[2] });
                            // } else {
                            //     aframeObject.setAttribute('scale', AFRAME.utils.coordinates.parse(propertyValue));
                            // }
                            break;

                        case "color":
                            aframeObject.setAttribute('color', propertyValue);
                            break;

                        case "transparent":
                            aframeObject.setAttribute('material', 'transparent', propertyValue);
                            break;

                        case "opacity":
                            aframeObject.setAttribute('material', 'opacity', propertyValue);
                            break;

                        case "fog":
                            aframeObject.setAttribute('material', 'fog', propertyValue);
                            break;

                        case "wireframe":
                            aframeObject.setAttribute('wireframe', propertyValue);
                            break;
                        case "wireframe-linewidth":
                            aframeObject.setAttribute('wireframeLinewidth', propertyValue);
                            break;

                        case "clickable":
                            if (propertyValue) {
                                aframeObject.setAttribute('class', 'intersectable');
                            } else {
                                aframeObject.setAttribute('class', 'nonintersectable');
                            }
                            node.events.clickable = propertyValue;
                            break;

                        case "visible":
                            aframeObject.setAttribute('visible', propertyValue);
                            break;

                        //  case "clickable":   
                        //          console.log("set clickable!");
                        //          value = propertyValue;
                        //      break;

                        // case "clickable":
                        //     if (propertyValue) {
                        //         aframeObject.addEventListener('click', function (evt) {
                        //              console.log("click!");
                        //             vwf_view.kernel.fireEvent(node.ID, "clickEvent",evt.detail.cursorEl.id);
                        //         });
                        //     }
                        //     break;


                        case "src":
                            aframeObject.setAttribute('src', propertyValue);
                            break;
                        case "repeat":
                            aframeObject.setAttribute('repeat', propertyValue);
                            break;


                        case "look-controls-enabled":
                            aframeObject.setAttribute('look-controls', 'enabled', propertyValue);
                            break;
                        case "wasd-controls":
                            aframeObject.setAttribute('wasd-controls', 'enabled', propertyValue);
                            break;

                        default:
                            value = undefined;
                            break;
                    }

                }

                if (value === undefined && aframeObject.nodeName == "A-TEXT") {
                    value = propertyValue;

                    switch (propertyName) {

                        case "value":
                            aframeObject.setAttribute('value', propertyValue);
                            break;

                        case "color":
                            aframeObject.setAttribute('color', propertyValue);
                            break;
                        case "side":
                            aframeObject.setAttribute('side', propertyValue);
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-SCENE") {
                    value = propertyValue;

                    switch (propertyName) {

                        case "fog":
                            aframeObject.setAttribute('fog', propertyValue);
                            break;
                        case "assets":
                            var assetsElement = document.createElement('a-assets');
                            aframeObject.appendChild(assetsElement);
                            if (propertyValue) {

                                httpGetJson(propertyValue).then(function (response) {
                                    console.log(JSON.parse(response));
                                    let assets = JSON.parse(response);
                                    for (var prop in assets) {
                                        var elm = document.createElement(assets[prop].tag);
                                        elm.setAttribute('id', prop);
                                        elm.setAttribute('src', assets[prop].src);
                                        assetsElement.appendChild(elm);

                                    }

                                }).catch(function (error) {
                                    console.log(error);
                                });

                            }
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-BOX") {
                    value = propertyValue;

                    switch (propertyName) {

                        case "depth":
                            aframeObject.setAttribute('depth', propertyValue);
                            break;
                        case "height":
                            aframeObject.setAttribute('height', propertyValue);
                            break;
                        case "width":
                            aframeObject.setAttribute('width', propertyValue);
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-LIGHT") {
                    value = propertyValue;

                    switch (propertyName) {

                        //"angle", "color", "decay", "distance", "ground-color", "intensity", "penumbra", "type", "target"
                        case "color":
                            aframeObject.setAttribute('color', propertyValue);
                            break;
                        case "type":
                            aframeObject.setAttribute('type', propertyValue);
                            break;
                        case "intensity":
                            aframeObject.setAttribute('intensity', propertyValue);
                            break;
                        case "distance":
                            aframeObject.setAttribute('distance', propertyValue);
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-COLLADA-MODEL") {
                    value = propertyValue;

                    switch (propertyName) {

                        case "src":
                            aframeObject.setAttribute('src', propertyValue);
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-PLANE") {
                    value = propertyValue;

                    switch (propertyName) {

                        case "height":
                            aframeObject.setAttribute('height', propertyValue);
                            break;
                        case "width":
                            aframeObject.setAttribute('width', propertyValue);
                            break;


                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-SPHERE") {
                    value = propertyValue;

                    switch (propertyName) {
                        case "radius":
                            aframeObject.setAttribute('radius', propertyValue);
                            break;

                        default:
                            value = undefined;
                            break;
                    }
                }


                if (value === undefined && aframeObject.nodeName == "A-ANIMATION") {
                    value = propertyValue;
                    switch (propertyName) {

                        // attribute:
                        // dur:
                        // from:
                        // to:
                        // repeat:

                        case "dur":
                            aframeObject.setAttribute('dur', propertyValue);
                            break;

                        case "from":
                            aframeObject.setAttribute('from', propertyValue);
                            break;

                        case "to":
                            aframeObject.setAttribute('to', propertyValue);
                            break;

                        case "repeat":
                            aframeObject.setAttribute('repeat', propertyValue);
                            break;

                        case "attribute":
                            aframeObject.setAttribute('attribute', propertyValue);
                            break;

                        case "begin":
                            aframeObject.setAttribute('begin', propertyValue);
                            break;

                        default:
                            value = undefined;
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-CAMERA") {
                    value = propertyValue;
                    switch (propertyName) {

                        case "userHeight":
                            aframeObject.setAttribute('camera', 'userHeight', propertyValue);
                            break;

                        // case "active":
                        //     aframeObject.setAttribute('camera', 'active', propertyValue);
                        //        break;

                        default:
                            value = undefined;
                            break;
                    }
                }

            }
            return value;
        },

        // -- gettingProperty ----------------------------------------------------------------------

        gettingProperty: function (nodeID, propertyName, propertyValue) {


            var node = this.state.nodes[nodeID];
            var value = undefined;

            if (node && node.aframeObj) {

                var aframeObject = node.aframeObj;

                if (isNodeDefinition(node.prototypes)) {
                    switch (propertyName) {
                    }
                }


                if (value === undefined && isAEntityDefinition(node.prototypes)) {

                    switch (propertyName) {

                        // case "interpolation":
                        //     var interpolation = aframeObject.getAttribute('interpolation');
                        //     if (interpolation !== null && interpolation !== undefined) {
                        //         value = interpolation.duration;
                        //     }
                        //     break;

                        case "position":
                            var pos = aframeObject.getAttribute('position');
                            if (pos !== undefined) {
                                value = AFRAME.utils.coordinates.stringify(pos);
                            }
                            break;
                        case "scale":
                            var scale = aframeObject.getAttribute('scale');
                            if (scale !== undefined) {
                                value = AFRAME.utils.coordinates.stringify(scale);
                            }
                            break;

                        case "rotation":
                            var rot = aframeObject.getAttribute('rotation');
                            if (rot !== undefined) {
                                value = AFRAME.utils.coordinates.stringify(rot);
                            }
                            break;

                        case "color":
                            value = aframeObject.getAttribute('color');
                            break;

                        case "fog":
                            if (aframeObject.getAttribute('material')) {
                                value = aframeObject.getAttribute('material').fog;
                            }
                            break;

                        case "opacity":
                            if (aframeObject.getAttribute('material')) {
                                value = aframeObject.getAttribute('material').opacity;
                            }
                            break;

                        case "transparent":
                            if (aframeObject.getAttribute('material')) {
                                value = aframeObject.getAttribute('material').transparent;
                            }
                            break;

                        case "wireframe":
                            value = aframeObject.getAttribute('wireframe');
                            break;

                        case "wireframe-linewidth":
                            value = aframeObject.getAttribute('wireframeLinewidth');
                            break;

                        case "clickable":
                            value = node.events.clickable;
                            break;

                        case "src":
                            value = aframeObject.getAttribute('src');
                            break;
                        case "repeat":
                            value = aframeObject.getAttribute('repeat');

                        case "look-controls-enabled":
                            var look = aframeObject.getAttribute('look-controls-enabled');
                            if (look !== null && look !== undefined) {
                                value = aframeObject.getAttribute('look-controls').enabled;
                            }
                            break;
                        case "wasd-controls":
                            var wasd = aframeObject.getAttribute('wasd-controls');
                            if (wasd !== null && wasd !== undefined) {
                                value = aframeObject.getAttribute('wasd-controls').enabled;
                            }
                            break;

                        case "visible":
                            value = aframeObject.getAttribute('visible');
                            break;

                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-SCENE") {

                    switch (propertyName) {
                        case "fog":
                            value = aframeObject.getAttribute('fog');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-BOX") {

                    switch (propertyName) {
                        case "depth":
                            value = aframeObject.getAttribute('depth');
                            break;
                        case "height":
                            value = aframeObject.getAttribute('height');
                            break;
                        case "width":
                            value = aframeObject.getAttribute('width');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-LIGHT") {

                    //"angle", "color", "decay", "distance", "ground-color", "intensity", "penumbra", "type", "target"
                    switch (propertyName) {
                        case "color":
                            value = aframeObject.getAttribute('color');
                            break;
                        case "type":
                            value = aframeObject.getAttribute('type');
                            break;
                        case "distance":
                            value = aframeObject.getAttribute('distance');
                            break;
                        case "intensity":
                            value = aframeObject.getAttribute('intensity');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-PLANE") {

                    switch (propertyName) {
                        case "height":
                            value = aframeObject.getAttribute('height');
                            break;
                        case "width":
                            value = aframeObject.getAttribute('width');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-SPHERE") {

                    switch (propertyName) {
                        case "radius":
                            value = aframeObject.getAttribute('radius');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-TEXT") {

                    switch (propertyName) {
                        case "value":
                            value = aframeObject.getAttribute('value');
                            break;

                        case "color":
                            value = aframeObject.getAttribute('color');
                            break;
                        case "side":
                            value = aframeObject.getAttribute('side');
                            break;
                    }
                }


                if (value === undefined && aframeObject.nodeName == "A-ANIMATION") {


                    switch (propertyName) {

                        case "attribute":
                            value = aframeObject.getAttribute('attribute');
                            break;


                        case "dur":
                            value = aframeObject.getAttribute('dur');
                            break;



                        case "from":
                            value = aframeObject.getAttribute('from');
                            break;



                        case "to":
                            value = aframeObject.getAttribute('to');
                            break;



                        case "repeat":
                            value = aframeObject.getAttribute('repeat');
                            break;



                        case "begin":
                            value = aframeObject.getAttribute('begin');
                            break;
                    }
                }

                if (value === undefined && aframeObject.nodeName == "A-CAMERA") {


                    switch (propertyName) {
                        case "userHeight":
                            value = aframeObject.getAttribute('camera').userHeight;
                            break;
                    }

                    //    switch (propertyName) {
                    //         case "active":
                    //             value = aframeObject.getAttribute('camera').active;
                    //             break;
                    //         }
                }

                if (value === undefined && aframeObject.nodeName == "A-COLLADA-MODEL") {

                    switch (propertyName) {
                        case "src":
                            value = aframeObject.getAttribute('src');
                            break;
                    }
                }

            }

            if (value !== undefined) {
                propertyValue = value;
            }

            return value;
        }
    });


    function createAFrameObject(node, config) {
        var protos = node.prototypes;
        var aframeObj = undefined;

        if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/ascene.vwf")) {
            aframeObj = document.createElement('a-scene');

            self.state.scenes[node.ID] = aframeObj;

        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/acamera.vwf")) {
            aframeObj = document.createElement('a-camera');
            aframeObj.setAttribute('camera', 'active', false);

        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/alight.vwf")) {
            aframeObj = document.createElement('a-light');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/acursor.vwf")) {
            aframeObj = document.createElement('a-cursor');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/asky.vwf")) {
            aframeObj = document.createElement('a-sky');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/abox.vwf")) {
            aframeObj = document.createElement('a-box');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/aplane.vwf")) {
            aframeObj = document.createElement('a-plane');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/atext.vwf")) {
            aframeObj = document.createElement('a-text');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/acolladamodel.vwf")) {
            aframeObj = document.createElement('a-collada-model');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/asphere.vwf")) {
            aframeObj = document.createElement('a-sphere');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/aanimation.vwf")) {
            aframeObj = document.createElement('a-animation');
        } else if (self.state.isAFrameClass(protos, "http://vwf.example.com/aframe/aentity.vwf")) {
            aframeObj = document.createElement('a-entity');
        }
        aframeObj.setAttribute('id', node.ID);
        return aframeObj;
    }

    function addNodeToHierarchy(node) {

        if (node.aframeObj) {
            if (self.state.nodes[node.parentID] !== undefined) {
                var parent = self.state.nodes[node.parentID];
                if (parent.aframeObj) {

                    if (parent.children === undefined) {
                        parent.children = [];
                    }
                    parent.children.push(node.ID);
                    //console.info( "Adding child: " + childID + " to " + nodeID );
                    parent.aframeObj.appendChild(node.aframeObj);
                }
            }
            if (node.aframeObj.nodeName !== "A-SCENE") {
                node.scene = self.state.scenes[self.kernel.application()];
            }

        }

    }


    function getPrototypes(kernel, extendsID) {
        var prototypes = [];
        var id = extendsID;

        while (id !== undefined) {
            prototypes.push(id);
            id = kernel.prototype(id);
        }
        return prototypes;
    }

    function isNodeDefinition(prototypes) {
        var found = false;
        if (prototypes) {
            for (var i = 0; i < prototypes.length && !found; i++) {
                found = (prototypes[i] == "http://vwf.example.com/aframe/node.vwf");
            }
        }
        return found;
    }

    function isAEntityDefinition(prototypes) {
        var found = false;
        if (prototypes) {
            for (var i = 0; i < prototypes.length && !found; i++) {
                found = (prototypes[i] == "http://vwf.example.com/aframe/aentity.vwf");
            }
        }
        return found;
    }





    // Changing this function significantly from the GLGE code
    // Will search hierarchy down until encountering a matching child
    // Will look into nodes that don't match.... this might not be desirable
    function FindChildByName(obj, childName, childType, recursive) {

        var child = undefined;
        if (recursive) {

            // TODO: If the obj itself has the child name, the object will be returned by this function
            //       I don't think this this desirable.

            if (nameTest.call(this, obj, childName)) {
                child = obj;
            } else if (obj.children && obj.children.length > 0) {
                for (var i = 0; i < obj.children.length && child === undefined; i++) {
                    child = FindChildByName(obj.children[i], childName, childType, true);
                }
            }
        } else {
            if (obj.children) {
                for (var i = 0; i < obj.children.length && child === undefined; i++) {
                    if (nameTest.call(this, obj.children[i], childName)) {
                        child = obj.children[i];
                    }
                }
            }
        }
        return child;

    }

    function nameTest(obj, name) {
        if (obj.name == "") {
            return (obj.parent.name + "Child" == name);
        } else {
            return (obj.name == name || obj.id == name || obj.vwfID == name);
        }
    }

    function httpGet(url) {
        return new Promise(function (resolve, reject) {
            // do the usual Http request
            let request = new XMLHttpRequest();
            request.open('GET', url);

            request.onload = function () {
                if (request.status == 200) {
                    resolve(request.response);
                } else {
                    reject(Error(request.statusText));
                }
            };

            request.onerror = function () {
                reject(Error('Network Error'));
            };

            request.send();
        });
    }
    async function httpGetJson(url) {
        // check if the URL looks like a JSON file and call httpGet.
        let regex = /\.(json)$/i;

        if (regex.test(url)) {
            // call the async function, wait for the result
            return await httpGet(url);
        } else {
            throw Error('Bad Url Format');
        }
    }

 


});