/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.webbeans.web.tomcat;

import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.servlet.ServletContextAttributeListener;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletRequestAttributeListener;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionListener;

import java.util.EventListener;

import org.apache.tomcat.util.res.StringManager;
import org.apache.webbeans.config.WebBeansContext;
import org.apache.webbeans.exception.WebBeansConfigurationException;
import org.apache.webbeans.spi.SecurityService;
import org.apache.webbeans.spi.plugins.AbstractOwbPlugin;

/**
 * Tomcat plugin for OpenWebBeans.
 */
public class TomcatPlugin extends AbstractOwbPlugin {

    private static final StringManager sm = StringManager.getManager(TomcatPlugin.class);

    /**
     * Security service implementation.
     */
    private final TomcatSecurityService securityService =
            (TomcatSecurityService) WebBeansContext.getInstance().getSecurityService();

    @Override
    public <T> T getSupportedService(Class<T> serviceClass) {
        if (serviceClass.equals(SecurityService.class)) {
            return serviceClass.cast(this.securityService);
        }
        return null;
    }

    @Override
    public void isManagedBean(Class<?> clazz) {
        if (isServletSpecClass(clazz)) {
            throw new WebBeansConfigurationException(sm.getString("plugin.notManagedBean", clazz.getName()));
        }
    }

    @Override
    public boolean supportsJavaEeComponentInjections(Class<?> clazz) {
        if (isServletSpecClass(clazz)) {
            return true;
        }
        return false;
    }

    private boolean isServletSpecClass(Class<?> clazz) {
        if (Servlet.class.isAssignableFrom(clazz)
                || Filter.class.isAssignableFrom(clazz)) {
            return true;
        }
        if (EventListener.class.isAssignableFrom(clazz)) {
            return ServletContextListener.class.isAssignableFrom(clazz)
                    || ServletContextAttributeListener.class.isAssignableFrom(clazz)
                    || HttpSessionActivationListener.class.isAssignableFrom(clazz)
                    || HttpSessionAttributeListener.class.isAssignableFrom(clazz)
                    || HttpSessionBindingListener.class.isAssignableFrom(clazz)
                    || HttpSessionListener.class.isAssignableFrom(clazz)
                    || ServletRequestListener.class.isAssignableFrom(clazz)
                    || ServletRequestAttributeListener.class.isAssignableFrom(clazz);
        }
        return false;
    }

    @Override
    public boolean supportService(Class<?> serviceClass) {
        if (serviceClass.equals(SecurityService.class)) {
            return true;
        }
        return false;
    }

}
