Home | History | Annotate | Download | only in feature 
      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