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
019package org.apache.hadoop.lib.wsrs;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.io.IOUtils;
023
024import javax.ws.rs.core.StreamingOutput;
025import java.io.IOException;
026import java.io.InputStream;
027import java.io.OutputStream;
028
029@InterfaceAudience.Private
030public class InputStreamEntity implements StreamingOutput {
031  private InputStream is;
032  private long offset;
033  private long len;
034
035  public InputStreamEntity(InputStream is, long offset, long len) {
036    this.is = is;
037    this.offset = offset;
038    this.len = len;
039  }
040
041  public InputStreamEntity(InputStream is) {
042    this(is, 0, -1);
043  }
044
045  @Override
046  public void write(OutputStream os) throws IOException {
047    IOUtils.skipFully(is, offset);
048    if (len == -1) {
049      IOUtils.copyBytes(is, os, 4096, true);
050    } else {
051      IOUtils.copyBytes(is, os, len, true);
052    }
053  }
054}