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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  }