/*
 * 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.deltaspike.servlet.impl.produce;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * This filter stores the current request and response in the {@link RequestResponseHolder}.
 */
public class RequestResponseHolderFilter implements Filter
{

    @Override
    public void init(FilterConfig config) throws ServletException
    {
        // nothing yet
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException
    {

        /*
         * Typically the request is bound to the thread in RequestResponseHolderListener. But as this listener was added
         * after the initial release of the Servlet module, the filter will also do it if necessary.
         */
        final boolean alreadyBound = RequestResponseHolder.REQUEST.isBound();
        if (!alreadyBound)
        {
            RequestResponseHolder.REQUEST.bind(request);
        }

        try
        {

            RequestResponseHolder.RESPONSE.bind(response);
            try
            {
                chain.doFilter(request, response);
            }
            finally
            {
                RequestResponseHolder.RESPONSE.release();
            }

        }
        finally
        {
            if (!alreadyBound)
            {
                RequestResponseHolder.REQUEST.release();
            }
        }

    }

    @Override
    public void destroy()
    {
        // nothing yet
    }

}
