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
17package com.google.common.io;
18
19import static com.google.common.base.Preconditions.checkNotNull;
20
21import java.io.FilterInputStream;
22import java.io.IOException;
23import java.io.InputStream;
24import java.util.Random;
25
26/** Returns a random portion of the requested bytes on each call. */
27class RandomAmountInputStream extends FilterInputStream {
28  private final Random random;
29
30  public RandomAmountInputStream(InputStream in, Random random) {
31    super(checkNotNull(in));
32    this.random = checkNotNull(random);
33  }
34
35  @Override public int read(byte[] b, int off, int len) throws IOException {
36    return super.read(b, off, random.nextInt(len) + 1);
37  }
38}
39