1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.tv.common.feature; 18 19 import android.content.Context; 20 import com.android.tv.common.util.CommonUtils; 21 import java.util.Arrays; 22 23 /** Static utilities for features. */ 24 public class FeatureUtils { 25 26 /** 27 * Returns a feature that is enabled if any of {@code features} is enabled. 28 * 29 * @param features the features to or 30 */ or(final Feature... features)31 public static Feature or(final Feature... features) { 32 return new Feature() { 33 @Override 34 public boolean isEnabled(Context context) { 35 for (Feature f : features) { 36 if (f.isEnabled(context)) { 37 return true; 38 } 39 } 40 return false; 41 } 42 43 @Override 44 public String toString() { 45 return "or(" + Arrays.asList(features) + ")"; 46 } 47 }; 48 } 49 50 /** 51 * Returns a feature that is enabled if all of {@code features} is enabled. 52 * 53 * @param features the features to and 54 */ 55 public static Feature and(final Feature... features) { 56 return new Feature() { 57 @Override 58 public boolean isEnabled(Context context) { 59 for (Feature f : features) { 60 if (!f.isEnabled(context)) { 61 return false; 62 } 63 } 64 return true; 65 } 66 67 @Override 68 public String toString() { 69 return "and(" + Arrays.asList(features) + ")"; 70 } 71 }; 72 } 73 74 /** 75 * Returns a feature that is opposite of the given {@code feature}. 76 * 77 * @param feature the feature to invert 78 */ 79 public static Feature not(final Feature feature) { 80 return new Feature() { 81 @Override 82 public boolean isEnabled(Context context) { 83 return !feature.isEnabled(context); 84 } 85 86 @Override 87 public String toString() { 88 return "not(" + feature + ")"; 89 } 90 }; 91 } 92 93 /** A feature that is always enabled. */ 94 public static final Feature ON = 95 new Feature() { 96 @Override 97 public boolean isEnabled(Context context) { 98 return true; 99 } 100 101 @Override 102 public String toString() { 103 return "on"; 104 } 105 }; 106 107 /** A feature that is always disabled. */ 108 public static final Feature OFF = 109 new Feature() { 110 @Override 111 public boolean isEnabled(Context context) { 112 return false; 113 } 114 115 @Override 116 public String toString() { 117 return "off"; 118 } 119 }; 120 121 /** True if running in robolectric. */ 122 public static final Feature ROBOLECTRIC = 123 new Feature() { 124 @Override 125 public boolean isEnabled(Context context) { 126 return CommonUtils.isRoboTest(); 127 } 128 129 @Override 130 public String toString() { 131 return "isRobolecteric"; 132 } 133 }; 134 135 private FeatureUtils() {} 136 } 137