1 // Copyright 2016 Google Inc. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package com.google.archivepatcher.shared; 16 17 import java.io.File; 18 import java.io.IOException; 19 20 /** 21 * An implementation of {@link MultiViewInputStreamFactory} that produces instances of 22 * {@link RandomAccessFileInputStream}. 23 */ 24 public class RandomAccessFileInputStreamFactory 25 implements MultiViewInputStreamFactory<RandomAccessFileInputStream> { 26 27 /** 28 * Argument for {@link RandomAccessFileInputStream#RandomAccessFileInputStream(File, long, long)}. 29 */ 30 private final File file; 31 32 /** 33 * Argument for {@link RandomAccessFileInputStream#RandomAccessFileInputStream(File, long, long)}. 34 */ 35 private final long rangeOffset; 36 37 /** 38 * Argument for {@link RandomAccessFileInputStream#RandomAccessFileInputStream(File, long, long)}. 39 */ 40 private final long rangeLength; 41 42 /** 43 * Constructs a new factory that will create instances of {@link RandomAccessFileInputStream} with 44 * the specified parameters. 45 * @param file the file to use in {@link #newStream()} 46 * @param rangeOffset the range offset to use in {@link #newStream()} 47 * @param rangeLength the range length to use in {@link #newStream()} 48 */ 49 public RandomAccessFileInputStreamFactory(File file, long rangeOffset, long rangeLength) { 50 this.file = file; 51 this.rangeOffset = rangeOffset; 52 this.rangeLength = rangeLength; 53 } 54 55 @Override 56 public RandomAccessFileInputStream newStream() throws IOException { 57 return new RandomAccessFileInputStream(file, rangeOffset, rangeLength); 58 } 59 } 60
