/*
    * Copyright 2007 Werner Guttmann
    *
    * 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
    *
    * 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.
   */
  package org.castor.core.annotationprocessing;
  
  import java.lang.annotation.Annotation;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  import org.castor.core.nature.BaseNature;
  
  /**
   * An AnnotationProcessingService handles multiple {@link AnnotationProcessor}s and uses them to
   * process one or more {@link Annotation}s. This is a standard implementation that should be
   * sufficient for most purposes.
   * 
   * @see AnnotationProcessingService
   * @author Alexander Eibner, Peter Schmidt
   * @since 1.3
   */
  
  public class BaseAnnotationProcessingService implements AnnotationProcessingService {
  
    /**
     * List of annotation processors.
     */
    private Map<Class<? extends Annotation>, AnnotationProcessor> _annotationProcessorMap =
        new HashMap<Class<? extends Annotation>, AnnotationProcessor>();
  
    /**
     * {@inheritDoc}
     * 
     * @see org.castor.annotationprocessing.AnnotationProcessingService#
     *      addAnnotationProcessor(AnnotationProcessor)
     */
    public void addAnnotationProcessor(final AnnotationProcessor annotationProcessor) {
      if (annotationProcessor != null) {
        _annotationProcessorMap.put(annotationProcessor.forAnnotationClass(), annotationProcessor);
      }
    }
  
    /**
     * {@inheritDoc}
     * 
     * @see org.castor.annotationprocessing.AnnotationProcessingService# getAnnotationProcessors()
     */
    public Set<AnnotationProcessor> getAnnotationProcessors() {
      return new HashSet<AnnotationProcessor>(_annotationProcessorMap.values());
    }
  
    /**
     * {@inheritDoc}
     * 
     * @see org.castor.annotationprocessing.AnnotationProcessingService#
     *      processAnnotations(BaseNature, Annotation[])
     */
    public <I extends BaseNature> Annotation[] processAnnotations(I info,
        final Annotation[] annotations) {
      ArrayList<Annotation> unprocessed = new ArrayList<Annotation>();
  
      for (int i = 0; i < annotations.length; i++) {
        if (processAnnotation(info, annotations[i]) == false) {
          unprocessed.add(annotations[i]);
        }
      }
  
      Annotation[] arrReturn = new Annotation[unprocessed.size()];
  
      return unprocessed.toArray(arrReturn);
    }
  
    /**
     * {@inheritDoc}
     * 
     * @see org.castor.annotationprocessing.AnnotationProcessingService#processAnnotation (BaseNature,
     *      Annotation)
     */
    public <I extends BaseNature, A extends Annotation> boolean processAnnotation(I info,
        final A annotation) {
      boolean processed = false;
      AnnotationProcessor annotationProcessor =
          _annotationProcessorMap.get(annotation.annotationType());
      if (annotationProcessor != null) {
        processed = annotationProcessor.processAnnotation(info, annotation);
      }
      return processed;
   }
 }