001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hdfs.server.datanode.fsdataset; 019 020import java.io.FilterInputStream; 021import java.io.InputStream; 022 023/** 024 * An input stream with length. 025 */ 026public class LengthInputStream extends FilterInputStream { 027 028 private final long length; 029 030 /** 031 * Create an stream. 032 * @param in the underlying input stream. 033 * @param length the length of the stream. 034 */ 035 public LengthInputStream(InputStream in, long length) { 036 super(in); 037 this.length = length; 038 } 039 040 /** @return the length. */ 041 public long getLength() { 042 return length; 043 } 044 045 public InputStream getWrappedStream() { 046 return in; 047 } 048}