1 /* 2 * Copyright (C) 2017 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.backup.transport; 18 19 import android.annotation.IntDef; 20 import android.annotation.Nullable; 21 import android.os.DeadObjectException; 22 import android.util.Log; 23 import android.util.Slog; 24 25 import com.android.internal.backup.IBackupTransport; 26 27 import java.lang.annotation.Retention; 28 import java.lang.annotation.RetentionPolicy; 29 30 /** Utility methods for transport-related operations. */ 31 public class TransportUtils { 32 private static final String TAG = "TransportUtils"; 33 34 /** 35 * Throws {@link TransportNotAvailableException} if {@param transport} is null. The semantics is 36 * similar to a {@link DeadObjectException} coming from a dead transport binder. 37 */ 38 public static IBackupTransport checkTransportNotNull(@Nullable IBackupTransport transport) 39 throws TransportNotAvailableException { 40 if (transport == null) { 41 log(Priority.ERROR, TAG, "Transport not available"); 42 throw new TransportNotAvailableException(); 43 } 44 return transport; 45 } 46 47 static void log(@Priority int priority, String tag, String message) { 48 if (priority == Priority.WTF) { 49 Slog.wtf(tag, message); 50 } else if (Log.isLoggable(tag, priority)) { 51 Slog.println(priority, tag, message); 52 } 53 } 54 55 static String formatMessage(@Nullable String prefix, @Nullable String caller, String message) { 56 StringBuilder string = new StringBuilder(); 57 if (prefix != null) { 58 string.append(prefix).append(" "); 59 } 60 if (caller != null) { 61 string.append("[").append(caller).append("] "); 62 } 63 return string.append(message).toString(); 64 } 65 66 /** 67 * Create our own constants so we can log WTF using the same APIs. Except for {@link 68 * Priority#WTF} all the others have the same value, so can be used directly 69 */ 70 @IntDef({Priority.VERBOSE, Priority.DEBUG, Priority.INFO, Priority.WARN, Priority.WTF}) 71 @Retention(RetentionPolicy.SOURCE) 72 @interface Priority { 73 int VERBOSE = Log.VERBOSE; 74 int DEBUG = Log.DEBUG; 75 int INFO = Log.INFO; 76 int WARN = Log.WARN; 77 int ERROR = Log.ERROR; 78 int WTF = -1; 79 } 80 81 private TransportUtils() {} 82 } 83
