/*
    *    Copyright 2006-2023 the original author or authors.
    *
    *    Licensed under the Apache License, Version 2.0 (the "License");
    *    you may not use this file except in compliance with the License.
    *    You may obtain a copy of the License at
    *
    *       https://www.apache.org/licenses/LICENSE-2.0
    *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package org.mybatis.generator.internal.util;
  
  import static org.mybatis.generator.internal.util.messages.Messages.getString;
  
  import java.io.File;
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.net.URLClassLoader;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import org.mybatis.generator.logging.Log;
  import org.mybatis.generator.logging.LogFactory;
  
  /**
   * This class holds methods useful for constructing custom classloaders.
   *
   * @author Jeff Butler
   */
  public class ClassloaderUtility {
  
      private static final Log LOG = LogFactory.getLog(ClassloaderUtility.class);
  
      /**
       * Utility Class - No Instances.
       */
      private ClassloaderUtility() {
      }
  
      public static ClassLoader getCustomClassloader(Collection<String> entries) {
          List<URL> urls = new ArrayList<>();
          File file;
  
          if (entries != null) {
              for (String classPathEntry : entries) {
                  file = new File(classPathEntry);
                  if (!file.exists()) {
                      LOG.warn(getString("Warning.31", classPathEntry)); //$NON-NLS-1$
                      continue;
                  }
  
                  try {
                      urls.add(file.toURI().toURL());
                  } catch (MalformedURLException e) {
                      // this shouldn't happen, but just in case...
                      throw new RuntimeException(getString(
                              "RuntimeError.9", classPathEntry)); //$NON-NLS-1$
                  }
              }
          }
  
          ClassLoader parent = Thread.currentThread().getContextClassLoader();
  
          return new URLClassLoader(urls.toArray(new URL[urls.size()]), parent);
      }
  }