package org.apache.maven.cli.logging;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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
   *
   *   http://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.
   */
  
  import java.io.IOException;
  import java.net.URL;
  import java.util.Enumeration;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  
  import org.apache.maven.cli.logging.impl.UnsupportedSlf4jBindingConfiguration;
  import org.codehaus.plexus.util.PropertyUtils;
  import org.slf4j.ILoggerFactory;
  
  /**
   * Slf4jConfiguration factory, loading implementations from <code>META-INF/maven/slf4j-configuration.properties</code>
   * configuration files in class loader: key is the class name of the ILoggerFactory, value is the class name of
   * the corresponding Slf4jConfiguration.
   *
   * @author Hervé Boutemy
   * @since 3.1.0
   */
  public class Slf4jConfigurationFactory
  {
      public static final String RESOURCE = "META-INF/maven/slf4j-configuration.properties";
  
      public static Slf4jConfiguration getConfiguration( ILoggerFactory loggerFactory )
      {
          Map<URL, Set<Object>> supported = new LinkedHashMap<>();
  
          String slf4jBinding = loggerFactory.getClass().getCanonicalName();
  
          try
          {
              Enumeration<URL> resources = Slf4jConfigurationFactory.class.getClassLoader().getResources( RESOURCE );
  
              while ( resources.hasMoreElements() )
              {
                  URL resource = resources.nextElement();
  
                  Properties conf = PropertyUtils.loadProperties( resource.openStream() );
  
                  String impl = conf.getProperty( slf4jBinding );
  
                  if ( impl != null )
                  {
                      return (Slf4jConfiguration) Class.forName( impl ).newInstance();
                  }
  
                  supported.put( resource, conf.keySet() );
              }
          }
          catch ( IOException | ClassNotFoundException | IllegalAccessException | InstantiationException e )
          {
              e.printStackTrace();
          }
  
          return new UnsupportedSlf4jBindingConfiguration( slf4jBinding, supported );
      }
  }