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     */
018    package org.apache.hadoop.hdfs.server.datanode.fsdataset;
019    
020    import java.io.FilterInputStream;
021    import java.io.InputStream;
022    
023    /**
024     * An input stream with length.
025     */
026    public 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    }