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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 input URL.
36       * @return <code>true</code> if the resource can be accessed, <code>false</code> otherwise.
37       * @throws MalformedURLException if <code>url</code> is malformed.
38       */
39      public static boolean isOnline(String url) throws MalformedURLException {
40          try {
41              final URLConnection connection = new URL(url).openConnection();
42              connection.getInputStream().close();
43              return true;
44          } catch (IOException ioe) {
45              if(ioe instanceof MalformedURLException) {
46                  throw (MalformedURLException) ioe;
47              }
48              return false;
49          }
50      }
51  
52      private URLUtils(){}
53  
54  }