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Camel HTTP support
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/**
 * 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.camel.component.http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.camel.Converter;
import org.apache.camel.Exchange;
import org.apache.camel.component.http.helper.GZIPHelper;

/**
 * Some converter methods making it easy to convert the body of a message to servlet types or to switch between
 * the underlying {@link ServletInputStream} or {@link BufferedReader} payloads etc.
 *
 * @version $Revision: 801145 $
 */
@Converter
public final class HttpConverter {

    private HttpConverter() {
    }

    @Converter
    public static HttpServletRequest toServletRequest(HttpMessage message) {
        if (message == null) {
            return null;
        }
        return message.getRequest();
    }

    @Converter
    public static HttpServletResponse toServletResponse(HttpMessage message) {
        if (message == null) {
            return null;
        }
        return message.getResponse();
    }

    @Converter
    public static ServletInputStream toServletInputStream(HttpMessage message) throws IOException {
        HttpServletRequest request = toServletRequest(message);
        if (request != null) {
            return request.getInputStream();
        }
        return null;
    }

    @Converter
    public static InputStream toInputStream(HttpMessage message) throws Exception {
        return toInputStream(toServletRequest(message));
    }

    @Converter
    public static BufferedReader toReader(HttpMessage message) throws IOException {
        HttpServletRequest request = toServletRequest(message);
        if (request != null) {
            return request.getReader();
        }
        return null;
    }

    @Converter
    public static InputStream toInputStream(HttpServletRequest request) throws IOException {
        if (request == null) {
            return null;
        }
        String contentEncoding = request.getHeader(Exchange.CONTENT_ENCODING);
        return GZIPHelper.toGZIPInputStream(contentEncoding, request.getInputStream());
    }

}