# HttpRequestInformationProcessor.java

    /*
     * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     * WSO2 Inc. 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.synapse.commons.emulator.http.consumer;

    import io.netty.buffer.ByteBuf;
    import io.netty.handler.codec.DecoderResult;
    import io.netty.handler.codec.http.HttpHeaders;
    import io.netty.handler.codec.http.HttpObject;
    import io.netty.handler.codec.http.HttpRequest;
    import io.netty.handler.codec.http.QueryStringDecoder;
    import io.netty.util.CharsetUtil;

    import java.util.List;
    import java.util.Map;

    public class HttpRequestInformationProcessor {

        public void process(HttpRequest request, HttpRequestContext requestContext) {
            populateRequestHeaders(request, requestContext);
            populateQueryParameters(request, requestContext);
            populateRequestContext(request, requestContext);
            populateHttpMethod(request, requestContext);
            populateHttpVersion(request, requestContext);
            populateConnectionKeepAlive(request, requestContext);
        }

        private void populateRequestHeaders(HttpRequest request, HttpRequestContext requestContext) {
            HttpHeaders headers = request.headers();
            if (!headers.isEmpty()) {
                for (Map.Entry<String, String> entry : headers.entries()) {
                    requestContext.addHeaderParameter(entry.getKey(), entry.getValue());
                }
            }
        }

        void appendDecoderResult(HttpRequestContext requestContext, HttpObject httpObject, ByteBuf content) {
            requestContext.appendResponseContent(content.toString(CharsetUtil.UTF_8));
            DecoderResult result = httpObject.getDecoderResult();
            if (result.isSuccess()) {
                return;
            }
            requestContext.appendResponseContent(result.cause());
        }

        private void populateQueryParameters(HttpRequest request, HttpRequestContext requestContext) {
            QueryStringDecoder queryStringDecoder = new QueryStringDecoder(request.getUri());
            Map<String, List<String>> params = queryStringDecoder.parameters();
            requestContext.setQueryParameters(params);
        }

        private void populateRequestContext(HttpRequest request, HttpRequestContext requestContext) {
            requestContext.setUri(request.getUri());
        }

        private void populateHttpMethod(HttpRequest request, HttpRequestContext requestContext) {
            requestContext.setHttpMethod(request.getMethod());
        }

        private void populateHttpVersion(HttpRequest request, HttpRequestContext requestContext) {
            requestContext.setHttpVersion(request.getProtocolVersion());
        }

        private void populateConnectionKeepAlive(HttpRequest request, HttpRequestContext requestContext) {
            requestContext.setKeepAlive(HttpHeaders.isKeepAlive(request));
        }

    }