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- // Licensed to Cloudera, Inc. under one
- // or more contributor license agreements. See the NOTICE file
- // distributed with this work for additional information
- // regarding copyright ownership. Cloudera, Inc. licenses this file
- // to you 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.
- /**
- * cclass is a javascript Class inheritance implementation.
- * Methods and class members should be in the second argument.
- * This ensures that they end up in the prototype of the function
- * and makes them available to each new object.
- *
- * Example Usage:
- * var A = cclass.create(function() {
- * this.instance_member = 'foo';
- * }, {
- * test: function() {;
- * // do something!!!
- * }});
- *
- * var B = A.extend(function() {
- * this.__proto__.constructor();
- * }, {
- * static_member: 'bob',
- * test: function(){
- * this.parent.test();
- * }
- * });
- *
- * var a = new B();
- * a.test();
- *
- */
- var cclass = (function($, undefined) {
- function extend(ext_fn, attrs) {
- function parent() {};
- // Need a function to create an object from.
- // The 'fn' function will use 'ext_fn' as its initializer.
- // We don't use 'ext_fn' itself since we modify the function extensively.
- function fn() {
- ext_fn.apply(this, arguments);
- };
- // 'this' should be the caller.
- // Should be a 'cclass' object.
- parent.prototype = this.prototype;
- // Create a 'class' members region via prototype chain.
- // If a method is not part of the object, it will check its
- // prototype chain.
- fn.prototype = new parent();
- // The constructor should be the copy of 'ext_fn'.
- fn.prototype.constructor = fn;
- fn.extend = extend;
- $.extend(fn.prototype, attrs || {}, {
- parent: parent.prototype
- });
- return fn;
- }
- return {
- create: function(fn, attrs) {
- $.extend(fn.prototype, attrs || {});
- fn.extend = extend;
- fn.parent = undefined;
- return fn;
- },
- extend: extend
- };
- })($, undefined);
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