| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.connectivity; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.net.NetworkRequest; |
| |
| import java.util.Collection; |
| |
| /** |
| * A class that knows how to find the best network matching a request out of a list of networks. |
| */ |
| public class NetworkRanker { |
| public NetworkRanker() { } |
| |
| /** |
| * Find the best network satisfying this request among the list of passed networks. |
| */ |
| // Almost equivalent to Collections.max(nais), but allows returning null if no network |
| // satisfies the request. |
| @Nullable |
| public NetworkAgentInfo getBestNetwork(@NonNull final NetworkRequest request, |
| @NonNull final Collection<NetworkAgentInfo> nais) { |
| NetworkAgentInfo bestNetwork = null; |
| int bestScore = Integer.MIN_VALUE; |
| for (final NetworkAgentInfo nai : nais) { |
| if (!nai.satisfies(request)) continue; |
| if (nai.getCurrentScore() > bestScore) { |
| bestNetwork = nai; |
| bestScore = nai.getCurrentScore(); |
| } |
| } |
| return bestNetwork; |
| } |
| } |