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 com.android.tv.common.BooleanSystemProperty; 22 23 /** 24 * Feature controlled by system property. 25 * 26 * <p>See {@link BooleanSystemProperty} for instructions on how to set using adb. 27 */ 28 public final class PropertyFeature implements Feature { 29 private final BooleanSystemProperty mProperty; 30 31 /** 32 * Create System Property backed feature. 33 * 34 * @param key the system property key. Length must be <= 31 characters. 35 * @param defaultValue the value to return if the property is undefined or empty. 36 */ 37 public PropertyFeature(String key, boolean defaultValue) { 38 if (key.length() > 31) { 39 // Since Features are initialized at startup and the keys are static go ahead and kill 40 // the application. 41 throw new IllegalArgumentException( 42 "Property keys have a max length of 31 characters but '" + key + "' is " + key 43 .length() + " characters."); 44 } 45 mProperty = new BooleanSystemProperty(key, defaultValue); 46 } 47 48 @Override 49 public boolean isEnabled(Context context) { 50 return mProperty.getValue(); 51 } 52 53 @Override 54 public String toString() { 55 return mProperty.toString(); 56 } 57 } 58
