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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.Constructor;
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 ClassInfo {

  private Storage storage;
  private Class _class;
  private Map, Annotation> annotations;
  private Map methods;
  private Map constructors;

  private Collection classCache;
  private Collection methodCache;
  private Collection constructorCache;

  public ClassInfo (Storage storage, Class _class) {
    this.storage = storage;
    this._class = _class;
  }

  public Class getAttachedClass() {
    return _class;
  }

  public Collection getAnnotations() {
    if (classCache == null) {
      if (annotations == null) {
        annotations = new ConcurrentHashMap, Annotation>();
        final Class parent = getAttachedClass().getSuperclass();
        if (parent != null) {
          addAnnotations(parent);
        }
        for (Class i : getAttachedClass().getInterfaces()) {
          addAnnotations(i);
        }
        for (Annotation a : getAttachedClass().getDeclaredAnnotations()) {
          annotations.put(a.getClass().getInterfaces()[0], a);
        }
      }
      classCache = annotations.values();
    }
    return classCache;
  }

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

    return null;
  }

  private void addAnnotations(Class _class) {
    for (Annotation annotation : storage.getClassInfo(_class).getAnnotations()) {
      if (annotation != null) {
        for (Class _interface : annotation.getClass().getInterfaces()) {
          annotations.put(_interface, annotation);
        }
      }
    }
  }

  public MethodInfo getMethodInfo(String methodName, Class... args) {
    try {
      return getMethodInfo( getAttachedClass().getMethod(methodName, args) );
    }
    catch (Exception e) {
      return null;
    }
  }

  public ConstructorInfo getConstructorInfo(Class... args) {
    try {
      return getConstructorInfo( getAttachedClass().getConstructor(args) );
    }
    catch (Exception e1) {
      // may be generic
      try {
        return getConstructorInfo( getAttachedClass().getConstructor(Object.class) );
      }
      catch (Exception e2) {
      }
      return null;
    }
  }

  public MethodInfo getMethodInfo(Method method) {
    return getMethodMap().get(method);
  }

  public ConstructorInfo getConstructorInfo(Constructor constr) {
    return getConstructorMap().get(constr);
  }

  public Collection getMethodsInfo() {
    return methodCache == null ? (methodCache = getMethodMap().values()) : methodCache;
  }

  public Collection getConstructorsInfo() {
    return constructorCache == null ? (constructorCache = getConstructorMap().values()) : constructorCache;
  }

  private Map getMethodMap() {
    if (methods == null) {
      methods = new ConcurrentHashMap();
      for (Method method : getAttachedClass().getMethods()) {
        methods.put(method, new MethodInfo(storage, this, method));
      }
    }
    return  methods;
  }

  private Map getConstructorMap() {
    if (constructors == null) {
      constructors = new ConcurrentHashMap();
      for (Constructor constr : getAttachedClass().getConstructors()) {
        constructors.put(constr, new ConstructorInfo(storage, this, constr));
      }
    }
    return  constructors;
  }

}