UAS2.0_DEV_TEST/ux/ajax/Simlet.js

/**
 * This is a base class for more advanced "simlets" (simulated servers). A simlet is asked
 * to provide a response given a {@link Ext.ux.ajax.SimXhr} instance.
 */
Ext.define('Ext.ux.ajax.Simlet', function () {
    var urlRegex = /([^?#]*)(#.*)?$/,
        dateRegex = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/,
        intRegex = /^[+-]?\d+$/,
        floatRegex = /^[+-]?\d+\.\d+$/;
 
    function parseParamValue (value) {
        var m;
 
        if (Ext.isDefined(value)) {
            value = decodeURIComponent(value);
 
            if (intRegex.test(value)) {
                value = parseInt(value, 10);
            } else if (floatRegex.test(value)) {
                value = parseFloat(value);
            } else if (!!(m = dateRegex.exec(value))) {
                value = new Date(Date.UTC(+m[1], +m[2]-1, +m[3], +m[4], +m[5], +m[6]));
            }
        }
 
        return value;
    }
 
    return {
        alias: 'simlet.basic',
 
        isSimlet: true,
 
        responseProps: ['responseText', 'responseXML', 'status', 'statusText', 'responseHeaders'],
 
        /**
         * @cfg {String/Function} responseText
         */
 
        /**
         * @cfg {String/Function} responseXML
         */
 
        /**
         * @cfg {Object/Function} responseHeaders
         */
 
        /**
         * @cfg {Number/Function} status
         */
        status: 200,
 
        /**
         * @cfg {String/Function} statusText
         */
        statusText: 'OK',
 
        constructor: function (config) {
            Ext.apply(this, config);
        },
 
        doGet: function (ctx) {
            return this.handleRequest(ctx);
        },
        
        doPost: function (ctx) {
            return this.handleRequest(ctx);
        },
 
        doRedirect: function (ctx) {
            return false;
        },
 
        doDelete: function (ctx) {
            var me = this,
                xhr = ctx.xhr,
                records = xhr.options.records;
            me.removeFromData(ctx,records);
        },
 
        /**
         * Performs the action requested by the given XHR and returns an object to be applied
         * on to the XHR (containing `status`, `responseText`, etc.). For the most part,
         * this is delegated to `doMethod` methods on this class, such as `doGet`.
         *
         * @param {Ext.ux.ajax.SimXhr} xhr The simulated XMLHttpRequest instance.
         * @return {Object} The response properties to add to the XMLHttpRequest.
         */
        exec: function (xhr) {
            var me = this,
                ret = {},
                method = 'do' + Ext.String.capitalize(xhr.method.toLowerCase()), // doGet 
                fn = me[method];
 
            if (fn) {
                ret = fn.call(me, me.getCtx(xhr.method, xhr.url, xhr));
            } else {
                ret = { status: 405, statusText: 'Method Not Allowed' };
            }
 
            return ret;
        },
 
        getCtx: function (method, url, xhr) {
            return {
                method: method,
                params: this.parseQueryString(url),
                url: url,
                xhr: xhr
            };
        },
 
        handleRequest: function(ctx) {
            var me = this,
                ret = {},
                val;
 
            Ext.Array.forEach(me.responseProps, function (prop) {
                if (prop in me) {
                    val = me[prop];
                    if (Ext.isFunction(val)) {
                        val = val.call(me, ctx);
                    }
                    ret[prop] = val;
                }
            });
 
            return ret;
        },
 
        openRequest: function (method, url, options, async) {
            var ctx = this.getCtx(method, url),
                redirect = this.doRedirect(ctx),
                xhr;
            if (options.action === 'destroy'){
                method = 'delete';
            }
            if (redirect) {
                xhr = redirect;
            } else {
                xhr = new Ext.ux.ajax.SimXhr({
                    mgr: this.manager,
                    simlet: this,
                    options: options
                });
                xhr.open(method, url, async);
            }
            
            return xhr;
        },
 
        parseQueryString : function (str) {
            var m = urlRegex.exec(str),
                ret = {},
                key,
                value,
                i, n;
 
            if (m && m[1]) {
                var pair, parts = m[1].split('&');
 
                for (i = 0, n = parts.length; i < n; ++i) {
                    if ((pair = parts[i].split('='))[0]) {
                        key = decodeURIComponent(pair.shift());
                        value = parseParamValue((pair.length > 1) ? pair.join('=') : pair[0]);
 
                        if (!(key in ret)) {
                            ret[key] = value;
                        } else if (Ext.isArray(ret[key])) {
                            ret[key].push(value);
                        } else {
                            ret[key] = [ret[key], value];
                        }
                    }
                }
            }
 
            return ret;
        },
 
        redirect: function (method, url, params) {
            switch (arguments.length) {
                case 2:
                    if (typeof url == 'string') {
                        break;
                    }
                    params = url;
                    // fall... 
                case 1:
                    url = method;
                    method = 'GET';
                    break;
            }
 
            if (params) {
                url = Ext.urlAppend(url, Ext.Object.toQueryString(params));
            }
            return this.manager.openRequest(method, url);
        },
 
        removeFromData: function(ctx, records) {
            var me = this,
                data = me.getData(ctx),
                model = (ctx.xhr.options.proxy && ctx.xhr.options.proxy.getModel()) || {},
                idProperty = model.idProperty || 'id';
 
            Ext.each(records, function(record) {
                var id = record.get(idProperty);
                for (var i = data.length; i-- > 0;) {
                    if (data[i][idProperty] === id) {
                        me.deleteRecord(i);
                        break;
                    }
                }
            });
        }
    };
}());