001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.nio; 029 030import java.io.IOException; 031import java.nio.channels.FileChannel; 032 033/** 034 * A content encoder capable of transferring data directly from a {@link FileChannel} 035 * 036 * @since 4.0 037 */ 038public interface FileContentEncoder extends ContentEncoder { 039 040 /** 041 * Transfers a portion of entity content from the given file channel 042 * to the underlying network channel. 043 * 044 * @param src the source FileChannel to transfer data from. 045 * @param position 046 * The position within the file at which the transfer is to begin; 047 * must be non-negative 048 * @param count 049 * The maximum number of bytes to be transferred; must be 050 * non-negative 051 * @throws IOException if some I/O error occurs. 052 * @return The number of bytes, possibly zero, 053 * that were actually transferred 054 */ 055 long transfer(FileChannel src, long position, long count) throws IOException; 056 057}