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.openers; 17 18 import com.google.android.libraries.mobiledatadownload.file.Behavior; 19 import com.google.android.libraries.mobiledatadownload.file.OpenContext; 20 import com.google.android.libraries.mobiledatadownload.file.Opener; 21 import com.google.errorprone.annotations.CanIgnoreReturnValue; 22 import java.io.IOException; 23 import java.io.OutputStream; 24 import java.util.List; 25 26 /** 27 * An opener that returns a simple OutputStream opened for write. Any existing content is truncated. 28 */ 29 public final class WriteStreamOpener implements Opener<OutputStream> { 30 31 private Behavior[] behaviors; 32 WriteStreamOpener()33 private WriteStreamOpener() {} 34 create()35 public static WriteStreamOpener create() { 36 return new WriteStreamOpener(); 37 } 38 39 @CanIgnoreReturnValue withBehaviors(Behavior... behaviors)40 public WriteStreamOpener withBehaviors(Behavior... behaviors) { 41 this.behaviors = behaviors; 42 return this; 43 } 44 45 @Override open(OpenContext openContext)46 public OutputStream open(OpenContext openContext) throws IOException { 47 OutputStream backendOutput = openContext.backend().openForWrite(openContext.encodedUri()); 48 List<OutputStream> chain = openContext.chainTransformsForWrite(backendOutput); 49 if (behaviors != null) { 50 for (Behavior behavior : behaviors) { 51 behavior.forOutputChain(chain); 52 } 53 } 54 return chain.get(0); 55 } 56 } 57