| /* |
| * Copyright (C) 2007 The Guava Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.io; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Random; |
| |
| /** Returns a random portion of the requested bytes on each call. */ |
| class RandomAmountInputStream extends FilterInputStream { |
| private final Random random; |
| |
| public RandomAmountInputStream(InputStream in, Random random) { |
| super(checkNotNull(in)); |
| this.random = checkNotNull(random); |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| return super.read(b, off, random.nextInt(len) + 1); |
| } |
| } |