package org.apache.onami.autobind.annotations.features;

 /*

  * 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.String.format;

 import static com.google.inject.multibindings.Multibinder.newSetBinder;

 import static java.util.logging.Level.FINE;

 import static java.util.logging.Level.INFO;

 import static org.apache.onami.autobind.install.BindingStage.BINDING;

 import static org.apache.onami.autobind.install.BindingStage.IGNORE;

 import java.lang.annotation.Annotation;

 import java.util.Map;

 import javax.inject.Singleton;

 import org.apache.onami.autobind.annotations.Bind;

 import org.apache.onami.autobind.install.BindingStage;

 import org.apache.onami.autobind.install.bindjob.BindingJob;

 import org.apache.onami.autobind.install.bindjob.MultiBindingJob;

 import com.google.inject.binder.ScopedBindingBuilder;

 import com.google.inject.multibindings.Multibinder;

 @Singleton

 public class MultiBindingFeature

     extends AutoBindingFeature

 {

     @Override

     public BindingStage accept( Class<Object> annotatedClass, Map<String, Annotation> annotations )

     {

         if ( annotations.containsKey( Bind.class.getName() ) )

         {

             Bind annotation = (Bind) annotations.get( Bind.class.getName() );

             if ( annotation.multiple() )

             {

                 return BINDING;

             }

         }

         return IGNORE;

     }

     @Override

     protected <T, V extends T> void bind( Class<V> implementationClass, Class<T> interf, Annotation annotation,

                                           Class<? extends Annotation> scope )

     {

         BindingJob job = new MultiBindingJob( scope, annotation, implementationClass.getName(), interf.getName() );

         if ( !tracer.contains( job ) )

         {

             Multibinder<T> builder;

             synchronized ( _binder )

             {

                 if ( annotation != null )

                 {

                     builder = newSetBinder( _binder, interf, annotation );

                 }

                 else

                 {

                     builder = newSetBinder( _binder, interf );

                 }

                 ScopedBindingBuilder scopedBindingBuilder = builder.addBinding().to( implementationClass );

                 if ( scope != null )

                 {

                     scopedBindingBuilder.in( scope );

                 }

             }

             tracer.add( job );

         }

         else

         {

             String message = format( "Ignoring Multi-BindingJob \"%s\", because it was already bound.", job );

             if ( _logger.isLoggable( FINE ) )

             {

                 _logger.log( FINE, message, new Exception( message ) );

             }

             else if ( _logger.isLoggable( INFO ) )

             {

                 _logger.log( INFO, message );

             }

         }

     }

 }