1 /* 2 * ==================================================================== 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * ==================================================================== 20 * 21 * This software consists of voluntary contributions made by many 22 * individuals on behalf of the Apache Software Foundation. For more 23 * information on the Apache Software Foundation, please see 24 * <http://www.apache.org/>. 25 * 26 */ 27 28 package org.apache.http.entity; 29 30 import org.apache.http.HttpException; 31 import org.apache.http.HttpMessage; 32 33 /** 34 * Represents a strategy to determine length of the enclosed content entity 35 * based on properties of the HTTP message. 36 * 37 * @since 4.0 38 */ 39 public interface ContentLengthStrategy { 40 41 int IDENTITY = -1; 42 int CHUNKED = -2; 43 44 /** 45 * Returns length of the given message in bytes. The returned value 46 * must be a non-negative number, {@link #IDENTITY} if the end of the 47 * message will be delimited by the end of connection, or {@link #CHUNKED} 48 * if the message is chunk coded 49 * 50 * @param message HTTP message 51 * @return content length, {@link #IDENTITY}, or {@link #CHUNKED} 52 * 53 * @throws HttpException in case of HTTP protocol violation 54 */ 55 long determineLength(HttpMessage message) throws HttpException; 56 57 }