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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 
 */
@SuppressWarnings("all")
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;
    }

}