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 21 import java.util.Arrays; 22 23 /** 24 * Static utilities for features. 25 */ 26 public class FeatureUtils { 27 28 /** 29 * Returns a feature that is enabled if any of {@code features} is enabled. 30 * 31 * @param features the features to or 32 */ 33 public static Feature OR(final Feature... features) { 34 return new Feature() { 35 @Override 36 public boolean isEnabled(Context context) { 37 for (Feature f : features) { 38 if (f.isEnabled(context)) { 39 return true; 40 } 41 } 42 return false; 43 } 44 45 @Override 46 public String toString() { 47 return "or(" + Arrays.asList(features) + ")"; 48 } 49 }; 50 51 } 52 53 /** 54 * Returns a feature that is enabled if all of {@code features} is enabled. 55 * 56 * @param features the features to and 57 */ 58 public static Feature AND(final Feature... features) { 59 return new Feature() { 60 @Override 61 public boolean isEnabled(Context context) { 62 for (Feature f : features) { 63 if (!f.isEnabled(context)) { 64 return false; 65 } 66 } 67 return true; 68 } 69 70 @Override 71 public String toString() { 72 return "and(" + Arrays.asList(features) + ")"; 73 } 74 }; 75 } 76 77 /** 78 * A feature that is always enabled. 79 */ 80 public static final Feature ON = new Feature() { 81 @Override 82 public boolean isEnabled(Context context) { 83 return true; 84 } 85 86 @Override 87 public String toString() { 88 return "on"; 89 } 90 }; 91 92 /** 93 * A feature that is always disabled. 94 */ 95 public static final Feature OFF = new Feature() { 96 @Override 97 public boolean isEnabled(Context context) { 98 return false; 99 } 100 101 @Override 102 public String toString() { 103 return "off"; 104 } 105 }; 106 107 private FeatureUtils() { 108 } 109 } 110