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1   /**
2    *    Copyright 2006-2016 the original author or authors.
3    *
4    *    Licensed under the Apache License, Version 2.0 (the "License");
5    *    you may not use this file except in compliance with the License.
6    *    You may obtain a copy of the License at
7    *
8    *       http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *    Unless required by applicable law or agreed to in writing, software
11   *    distributed under the License is distributed on an "AS IS" BASIS,
12   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *    See the License for the specific language governing permissions and
14   *    limitations under the License.
15   */
16  package org.mybatis.generator.internal.util;
17  
18  import static org.mybatis.generator.internal.util.messages.Messages.getString;
19  
20  import java.io.File;
21  import java.net.MalformedURLException;
22  import java.net.URL;
23  import java.net.URLClassLoader;
24  import java.util.ArrayList;
25  import java.util.List;
26  
27  /**
28   * This class holds methods useful for constructing custom classloaders.
29   * 
30   * @author Jeff Butler
31   * 
32   */
33  public class ClassloaderUtility {
34  
35      /**
36       * Utility Class - No Instances
37       */
38      private ClassloaderUtility() {
39      }
40  
41      public static ClassLoader getCustomClassloader(List<String> entries) {
42          List<URL> urls = new ArrayList<URL>();
43          File file;
44  
45          if (entries != null) {
46              for (String classPathEntry : entries) {
47                  file = new File(classPathEntry);
48                  if (!file.exists()) {
49                      throw new RuntimeException(getString(
50                              "RuntimeError.9", classPathEntry)); //$NON-NLS-1$
51                  }
52  
53                  try {
54                      urls.add(file.toURI().toURL());
55                  } catch (MalformedURLException e) {
56                      // this shouldn't happen, but just in case...
57                      throw new RuntimeException(getString(
58                              "RuntimeError.9", classPathEntry)); //$NON-NLS-1$
59                  }
60              }
61          }
62  
63          ClassLoader parent = Thread.currentThread().getContextClassLoader();
64  
65          URLClassLoader ucl = new URLClassLoader(urls.toArray(new URL[urls
66                  .size()]), parent);
67  
68          return ucl;
69      }
70  }