net.sf.staccatocommons.instrument.internal.AnnotationProcessor Maven / Gradle / Ivy

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/**
 *  Copyright (c) 2010-2012, The StaccatoCommons Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; version 3 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 */

package net.sf.staccatocommons.instrument.internal;

import java.util.Collection;
import java.util.LinkedList;

import net.sf.staccatocommons.collections.stream.Stream;
import net.sf.staccatocommons.collections.stream.Streams;
import net.sf.staccatocommons.instrument.handler.AnnotationHandler;
import net.sf.staccatocommons.lang.block.Block2;
import net.sf.staccatocommons.lang.predicate.AbstractPredicate;

/**
 * @author flbulgarelli
 * 
 */
class AnnotationProcessor {

  private final Collection handlers;

  /**
   * Creates a new {@link AnnotationProcessor}
   */
  public AnnotationProcessor() {
    this.handlers = new LinkedList();
  }

  public void processUsing(final Object[] annotations, Block2 block) {
    for (Object annotation : annotations)
      for (HandlerType handler : getHandlers(annotation)) {
        block.exec(annotation, handler);
      }
  }

  private Stream getHandlers(final Object annotation) {
    return Streams.from(handlers).filter(//
      new AbstractPredicate() {
        public boolean eval(HandlerType argument) {
          return argument.getSupportedAnnotationType().isAssignableFrom(annotation.getClass());
        }
      });
  }

  /** Adds a handler */
  public void addHandler(HandlerType handler) {
    this.handlers.add(handler);
  }

}