| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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. |
| */ |
| |
| module.exports = { |
| |
| /** |
| * Exclude objects from <code>collection</code> if its <code>key</code> exist in <code>valuesToReject</code> |
| * Example: |
| * <code> |
| * var collection = [{n: 'v1'}, {n: 'v2'}, {n: 'v3'}, {n: 'v4'}], |
| * key = 'n', |
| * valuesToReject = ['v2', 'v3']; |
| * var result = rejectPropertyValues(collection, key, valuesToReject); // [{n: 'v1'}, {n: 'v4'}] |
| * </code> |
| * @param {Object[]} collection array of objects |
| * @param {String} key property name of each object to be checked |
| * @param {String[]} valuesToReject list of <code>key</code> values. Objects with <code>key</code>, |
| * equal to one of them, will be excluded |
| * @returns {Object[]} Rejected array |
| */ |
| rejectPropertyValues: function(collection, key, valuesToReject) { |
| return collection.filter(function (item) { |
| var propertyValue = Em.get(item, key); |
| return !valuesToReject.contains(propertyValue); |
| }); |
| }, |
| |
| /** |
| * Wrapper to <code>filterProperty</code>-method that allows using list of values to filter |
| * Example: |
| * <code> |
| * var collection = [{n: 'v1'}, {n: 'v2'}, {n: 'v3'}, {n: 'v4'}], |
| * key = 'n', |
| * valuesToFilter = ['v2', 'v3']; |
| * var result = filterPropertyValues(collection, key, valuesToFilter); // [{n: 'v2'}, {n: 'v3'}] |
| * </code> |
| * @param {Object[]} collection array of objects |
| * @param {String} key property name of each object to be filtered |
| * @param {String|String[]} valuesToFilter array of values (or one value-string) to filter |
| * @returns {Object[]} Filtered array |
| */ |
| filterPropertyValues: function(collection, key, valuesToFilter) { |
| var type = Em.typeOf(valuesToFilter); |
| if ('string' === type) |
| return collection.filterProperty(key, valuesToFilter); |
| |
| var ret = []; |
| if ('array' === type) { |
| valuesToFilter.forEach(function (value) { |
| ret = ret.concat(collection.filterProperty(key, value)); |
| }); |
| } |
| return ret; |
| }, |
| |
| /** |
| * Group <code>collection</code> items by <code>key</code> value |
| * Example: |
| * <code> |
| * var collection = [{n: 'v1'}, {n: 'v2'}, {n: 'v2'}, {n: 'v4'}], |
| * key = 'n'; |
| * var result = groupPropertyValues(collection, key); // {v1: [{n: 'v1'}], v2: [{n: 'v2'}, {n: 'v2'}], v4: [{n: 'v4'}]} |
| * </code> |
| * @param {Object[]} collection array of objects |
| * @param {String} key property name of each object to be grouped |
| * @returns {object} |
| */ |
| groupPropertyValues: function(collection, key) { |
| var group = {}; |
| collection.forEach(function(item) { |
| var value = Em.get(item, key); |
| if (Em.isNone(group[value])) { |
| group[value] = [item]; |
| } |
| else { |
| group[value].pushObject(item); |
| } |
| }); |
| return group; |
| } |
| |
| }; |