1 /* 2 * Copyright 2022 Google LLC 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 package com.google.android.libraries.mobiledatadownload.file.common.internal; 17 18 import android.os.Build; 19 import java.io.IOException; 20 import java.util.List; 21 import java.util.Locale; 22 23 /** Static helpers for commonly-used operations on {@link Exception} classes. */ 24 public final class Exceptions { 25 26 /** 27 * Combines multiple {@code causes} into a single new {@link IOException}. Causes are attached to 28 * the new exception as {@code suppressed}, or if unsupported (SDK <19), the new exception message 29 * simply includes the number of causes. 30 */ combinedIOException(String message, List<IOException> causes)31 public static IOException combinedIOException(String message, List<IOException> causes) { 32 // addSuppressed is available on SDK 19+. 33 if (Build.VERSION.SDK_INT < 19) { 34 String suppressedCount = 35 String.format(Locale.US, " (%d suppressed exceptions)", causes.size()); 36 return new IOException(message + suppressedCount); 37 } 38 39 IOException result = new IOException(message); 40 for (IOException cause : causes) { 41 result.addSuppressed(cause); 42 } 43 return result; 44 } 45 Exceptions()46 private Exceptions() {} 47 } 48