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.io.IOUtils; 022 023 import javax.ws.rs.core.StreamingOutput; 024 import java.io.IOException; 025 import java.io.InputStream; 026 import java.io.OutputStream; 027 028 public class InputStreamEntity implements StreamingOutput { 029 private InputStream is; 030 private long offset; 031 private long len; 032 033 public InputStreamEntity(InputStream is, long offset, long len) { 034 this.is = is; 035 this.offset = offset; 036 this.len = len; 037 } 038 039 public InputStreamEntity(InputStream is) { 040 this(is, 0, -1); 041 } 042 043 @Override 044 public void write(OutputStream os) throws IOException { 045 long skipped = is.skip(offset); 046 if (skipped < offset) { 047 throw new IOException("Requested offset beyond stream size"); 048 } 049 if (len == -1) { 050 IOUtils.copyBytes(is, os, 4096, true); 051 } else { 052 IOUtils.copyBytes(is, os, len, true); 053 } 054 } 055 }