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 /*
  * TeleStax, Open Source Cloud Communications
  * Copyright 2011-2016, TeleStax Inc. and individual contributors
  * by the @authors tag.
  *
  * This program is free software: you can redistribute it and/or modify
  * under the terms of the GNU Affero General Public License as
  * published by the Free Software Foundation; either version 3 of
  * the License, or (at your option) any later version.
  *
  * 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 Affero General Public License for more details.
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program.  If not, see 
  *
  * This file incorporates work covered by the following copyright and
  * permission notice:
  *
  *   JBoss, Home of Professional Open Source
  *   Copyright 2007-2011, Red Hat, Inc. and individual contributors
  *   by the @authors tag. See the copyright.txt in the distribution for a
  *   full listing of individual contributors.
  *
  *   This 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; either version 2.1 of
  *   the License, or (at your option) any later version.
  *
  *   This software 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.
  *
  *   You should have received a copy of the GNU Lesser General Public
  *   License along with this software; if not, write to the Free
  *   Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  *   02110-1301 USA, or see the FSF site: http://www.fsf.org.
  */

package org.jdiameter.client.impl.annotation.internal;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 * @author [email protected]
 * @author  Alexandre Mendonca 
 * @author  Bartosz Baranowski 
 */
public class MethodInfo  {

  private Storage storage;
  private Method method;
  private ClassInfo classInfo;
  private Collection annotationsCache;
  private Map, Annotation> annotationStorage;

  public MethodInfo(Storage storage, ClassInfo classInfo, Method method) {
    this.storage = storage;
    this.classInfo = classInfo;
    this.method = method;
  }

  public Method getMethod() {
    return method;
  }

  public ClassInfo getClassInfo() {
    return classInfo;
  }

  public Collection getAnnotations() {
    return annotationsCache == null ? (annotationsCache = getAnnotationStorage().values()) : annotationsCache;
  }

  public  T getAnnotation(Class annotation) {
    for (Annotation a : getAnnotations()) {
      if (a.annotationType() == annotation) {
        return (T) a;
      }
    }
    return null;
  }

  private Map, Annotation> getAnnotationStorage() {
    if (annotationStorage == null) {
      annotationStorage = new ConcurrentHashMap, Annotation>();
      Class parent = getClassInfo().getAttachedClass().getSuperclass();
      if (parent != null) {
        addAnnotations(storage.getClassInfo(parent).getMethodInfo(getMethod().getName(), getMethod().getParameterTypes()));
      }
      for (Class i : getClassInfo().getAttachedClass().getInterfaces()) {
        addAnnotations(storage.getClassInfo(i).getMethodInfo(getMethod().getName(), getMethod().getParameterTypes()));
      }
      for (Annotation a : getMethod().getDeclaredAnnotations()) {
        annotationStorage.put(a.getClass().getInterfaces()[0], a);
      }
    }
    return annotationStorage;
  }

  private void addAnnotations(MethodInfo method) {
    if (method != null) {
      for (Annotation annotation : method.getAnnotations()) {
        if (annotation != null) {
          for (Class _interface : annotation.getClass().getInterfaces()) {
            annotationStorage.put( _interface, annotation ); // [0]
          }
        }
      }
    }
  }
}