1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.index.updater;
20
21 import java.io.FileNotFoundException;
22 import java.io.IOException;
23 import java.io.InputStream;
24
25 /**
26 * An interface defining resource downloading contract
27 *
28 * @author Eugene Kuleshov
29 */
30 public interface ResourceFetcher {
31 /**
32 * Connect and start transfer session
33 */
34 void connect(String id, String url) throws IOException;
35
36 /**
37 * Disconnect and complete transfer session
38 */
39 void disconnect() throws IOException;
40
41 /**
42 * Retrieves resource as InputStream
43 *
44 * @param name a name of resource to retrieve
45 */
46 InputStream retrieve(String name) throws IOException, FileNotFoundException;
47 }