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The Async Http Client (AHC) classes.
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/*
 * Copyright (c) 2015 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.handler.intercept;

import static org.asynchttpclient.util.Assertions.assertNotNull;
import io.netty.channel.Channel;

import org.asynchttpclient.AsyncHandler;
import org.asynchttpclient.AsyncHttpClientConfig;
import org.asynchttpclient.HttpResponseHeaders;
import org.asynchttpclient.HttpResponseStatus;
import org.asynchttpclient.filter.FilterContext;
import org.asynchttpclient.filter.FilterException;
import org.asynchttpclient.filter.ResponseFilter;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.request.NettyRequestSender;

public class ResponseFiltersInterceptor {

    private final AsyncHttpClientConfig config;
    private final NettyRequestSender requestSender;

    public ResponseFiltersInterceptor(AsyncHttpClientConfig config, NettyRequestSender requestSender) {
        this.config = config;
        this.requestSender = requestSender;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    public boolean exitAfterProcessingFilters(//
            Channel channel,//
            NettyResponseFuture future,//
            AsyncHandler handler, //
            HttpResponseStatus status,//
            HttpResponseHeaders responseHeaders) {

        FilterContext fc = new FilterContext.FilterContextBuilder().asyncHandler(handler).request(future.getCurrentRequest()).responseStatus(status)
                .responseHeaders(responseHeaders).build();

        for (ResponseFilter asyncFilter : config.getResponseFilters()) {
            try {
                fc = asyncFilter.filter(fc);
                // FIXME Is it worth protecting against this?
                assertNotNull("fc", "filterContext");
            } catch (FilterException efe) {
                requestSender.abort(channel, future, efe);
            }
        }

        // The handler may have been wrapped.
        future.setAsyncHandler(fc.getAsyncHandler());

        // The request has changed
        if (fc.replayRequest()) {
            requestSender.replayRequest(future, fc, channel);
            return true;
        }
        return false;
    }
}