1 /* 2 * Copyright (C) 2007 The Guava Authors 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.google.common.io; 18 19 import java.io.FilterInputStream; 20 import java.io.IOException; 21 import java.io.InputStream; 22 import java.util.Random; 23 24 /** Returns a random portion of the requested bytes on each call. */ 25 class RandomAmountInputStream extends FilterInputStream { 26 private final Random random; 27 RandomAmountInputStream(InputStream in, Random random)28 public RandomAmountInputStream(InputStream in, Random random) { 29 super(in); 30 this.random = random; 31 } 32 read(byte[] b, int off, int len)33 @Override public int read(byte[] b, int off, int len) throws IOException { 34 return super.read(b, off, random.nextInt(len) + 1); 35 } 36 } 37