1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.any23.util;
19
20 import java.io.IOException;
21 import java.net.MalformedURLException;
22 import java.net.URL;
23 import java.net.URLConnection;
24
25 /**
26 * Contains general utility functions for handling URLs.
27 *
28 * @author Michele Mostarda (mostarda@fbk.eu)
29 */
30 public class URLUtils {
31
32 /**
33 * Verifies if the specified URL is reachable online.
34 *
35 * @param url
36 * input URL.
37 *
38 * @return <code>true</code> if the resource can be accessed, <code>false</code> otherwise.
39 *
40 * @throws MalformedURLException
41 * if <code>url</code> is malformed.
42 */
43 public static boolean isOnline(String url) throws MalformedURLException {
44 try {
45 final URLConnection connection = new URL(url).openConnection();
46 connection.getInputStream().close();
47 return true;
48 } catch (IOException ioe) {
49 if (ioe instanceof MalformedURLException) {
50 throw (MalformedURLException) ioe;
51 }
52 return false;
53 }
54 }
55
56 private URLUtils() {
57 }
58
59 }