1 // Copyright 2021 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package com.google.android.downloader; 16 17 import java.util.Set; 18 19 /** Abstraction of a request engine, which is a high-level interface into a network stack. */ 20 public interface UrlEngine { 21 /** 22 * Creates a request for the given URL. The request is returned as a {@link UrlRequest.Builder}, 23 * so that callers may further customize the request. Callers must call {@link UrlRequest#send} to 24 * execute the request. 25 * 26 * @param url the URL to connect to. Internal code will assume this is a valid, well-formed URL, 27 * so client code must have already verified the URL. 28 */ createRequest(String url)29 UrlRequest.Builder createRequest(String url); 30 31 /** 32 * Returns the set of URL schemes supported by this url request factory instance. Network stacks 33 * that connect over HTTP will likely return the set {"http", "https"}, but there may be many 34 * other types of schemes available (e.g. "file" or "data"). 35 */ supportedSchemes()36 Set<String> supportedSchemes(); 37 } 38