1 /* 2 * Copyright (C) 2019 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.server.telecom.callfiltering; 18 19 import java.util.ArrayList; 20 import java.util.List; 21 import java.util.concurrent.CompletableFuture; 22 import java.util.concurrent.CompletionStage; 23 24 public class CallFilter { 25 private List<CallFilter> mDependencies; 26 private List<CallFilter> mFollowings; 27 private int mIndegree; 28 public CallFilteringResult mPriorStageResult; 29 public CallFilteringResult result; 30 private CompletableFuture<CallFilteringResult> mResultFuture; 31 CallFilter()32 public CallFilter() { 33 mDependencies = new ArrayList<>(); 34 mFollowings = new ArrayList<>(); 35 mPriorStageResult = null; 36 } 37 startFilterLookup( CallFilteringResult priorStageResult)38 public CompletionStage<CallFilteringResult> startFilterLookup( 39 CallFilteringResult priorStageResult) { 40 return CompletableFuture.completedFuture(priorStageResult); 41 } 42 getDependencies()43 List<CallFilter> getDependencies() { 44 return mDependencies; 45 } 46 addDependency(CallFilter filter)47 void addDependency(CallFilter filter) { 48 synchronized (this) { 49 mDependencies.add(filter); 50 mIndegree = mDependencies.size(); 51 } 52 } 53 getFollowings()54 List<CallFilter> getFollowings() { 55 return mFollowings; 56 } 57 addFollowings(CallFilter filter)58 void addFollowings(CallFilter filter) { 59 mFollowings.add(filter); 60 } 61 decrementAndGetIndegree()62 int decrementAndGetIndegree() { 63 synchronized (this) { 64 mIndegree--; 65 return mIndegree; 66 } 67 } 68 getResult()69 public CallFilteringResult getResult() { 70 if (result == null) { 71 throw new NullPointerException("Result of this filter is null. This filter hasn't " 72 + "finished performing"); 73 } else { 74 return result; 75 } 76 } 77 } 78