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
019 package org.apache.hadoop.lib.wsrs;
020
021 import org.apache.hadoop.classification.InterfaceAudience;
022 import org.apache.hadoop.io.IOUtils;
023
024 import javax.ws.rs.core.StreamingOutput;
025 import java.io.IOException;
026 import java.io.InputStream;
027 import java.io.OutputStream;
028
029 @InterfaceAudience.Private
030 public 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 }