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}