package org.apache.onami.autobind.scanner;
   
   /*
    * 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 static java.lang.System.getProperty;
  import static java.util.logging.Level.FINE;
  import static java.util.logging.Level.INFO;
  import static java.util.logging.Level.SEVERE;
  import static java.util.logging.Logger.getLogger;
  
  import java.io.IOException;
  import java.util.Set;
  import java.util.logging.Logger;
  
  import javax.inject.Inject;
  
  import org.apache.onami.autobind.annotations.Bind;
  import org.apache.onami.autobind.annotations.GuiceModule;
  import org.apache.onami.autobind.install.InstallationContext;
  import org.apache.onami.autobind.scanner.features.BindingScannerFeature;
  import org.apache.onami.autobind.scanner.features.ScannerFeature;
  
  import com.google.inject.Binder;
  import com.google.inject.Module;
  
  /**
   * The ScannerModule will be injected with a ClasspathScanner and the needed
   * Annotation Listeners will be added. The attached Listeners will install all
   * Modules annotated with {@link GuiceModule} and bind all Beans annotated with
   * {@link Bind}.
   */
  public class ScannerModule
      implements Module
  {
  
      private static String LINE_SEPARATOR = getProperty( "line.separator" );
  
      private final Logger _logger = getLogger( getClass().getName() );
  
      @Inject
      private ClasspathScanner _scanner;
  
      @Inject
      private Set<ScannerFeature> _listeners;
  
      @Inject
      private InstallationContext _context;
  
      @Override
      public void configure( Binder binder )
      {
          if ( _logger.isLoggable( INFO ) )
          {
              StringBuilder builder = new StringBuilder( _scanner.getClass().getName() )
                                      .append( " is using following Scanner Features: " )
                                      .append( LINE_SEPARATOR );
              for ( ScannerFeature listener : _listeners )
              {
                  builder.append( listener.getClass().getName() ).append( LINE_SEPARATOR );
              }
              _logger.log( INFO, builder.toString() );
          }
          for ( ScannerFeature listener : _listeners )
          {
              if ( listener instanceof BindingScannerFeature )
              {
                  ( (BindingScannerFeature) listener ).setBinder( binder );
                  if ( _logger.isLoggable( FINE ) )
                  {
                      _logger.fine( "Binding AnnotationListeners " + listener.getClass().getName() );
                  }
              }
          }
          try
          {
              _scanner.scan();
          }
          catch ( IOException e )
          {
              _logger.log( SEVERE, "Failure while Scanning the Classpath for Classes with Annotations.", e );
          }
          try
          {
              _context.process();
         }
         catch ( Exception e )
         {
             _logger.log( SEVERE, "Failure while executing the collected Tasks.", e );
         }
     }
 
 }