# Qi4jFilter.java

    /*
     * Copyright (c) 2010, Paul Merlin. All Rights Reserved.
     *
     * Licensed 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.qi4j.library.servlet;

    import javax.servlet.Filter;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import org.qi4j.api.structure.Application;
    import org.qi4j.library.servlet.lifecycle.AbstractQi4jServletBootstrap;

    /**
     * Base Filter providing easy access to the {@link Application} from the {@link ServletContext}.
     * @see AbstractQi4jServletBootstrap
     */
    public abstract class Qi4jFilter
            implements Filter
    {

        private Application application;

        @Override
        public void init( FilterConfig filterConfig )
                throws ServletException
        {
            application = Qi4jServletSupport.application( filterConfig.getServletContext() );
        }

        protected final Application application()
        {
            return application;
        }

    }