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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.codec.http;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.handler.codec.frame.TooLongFrameException;


/**
 * Decodes {@link ChannelBuffer}s into {@link HttpRequest}s and {@link HttpChunk}s.
 *
 * Parameters that prevents excessive memory consumption
 * 
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 * Name Meaning
{@code maxInitialLineLength} The maximum length of the initial line (e.g. {@code "GET / HTTP/1.0"})
 *     If the length of the initial line exceeds this value, a
 *     {@link TooLongFrameException} will be raised.
{@code maxHeaderSize} The maximum length of all headers.  If the sum of the length of each
 *     header exceeds this value, a {@link TooLongFrameException} will be raised.
{@code maxChunkSize} The maximum length of the content or each chunk.  If the content length
 *     exceeds this value, the transfer encoding of the decoded request will be
 *     converted to 'chunked' and the content will be split into multiple
 *     {@link HttpChunk}s.  If the transfer encoding of the HTTP request is
 *     'chunked' already, each chunk will be split into smaller chunks if the
 *     length of the chunk exceeds this value.  If you prefer not to handle
 *     {@link HttpChunk}s in your handler, insert {@link HttpChunkAggregator}
 *     after this decoder in the {@link ChannelPipeline}.
 */
public class HttpRequestDecoder extends HttpMessageDecoder {

    /**
     * Creates a new instance with the default
     * {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
     * {@code maxChunkSize (8192)}.
     */
    public HttpRequestDecoder() {
    }

    /**
     * Creates a new instance with the specified parameters.
     */
    public HttpRequestDecoder(
            int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
        super(maxInitialLineLength, maxHeaderSize, maxChunkSize);
    }

    @Override
    protected HttpMessage createMessage(String[] initialLine) throws Exception {
        return new DefaultHttpRequest(
                HttpVersion.valueOf(initialLine[2]), HttpMethod.valueOf(initialLine[0]), initialLine[1]);
    }

    @Override
    protected boolean isDecodingRequest() {
        return true;
    }
}

Name	Meaning
{@code maxInitialLineLength}	The maximum length of the initial line (e.g. {@code "GET / HTTP/1.0"}) * If the length of the initial line exceeds this value, a * {@link TooLongFrameException} will be raised.
{@code maxHeaderSize}	The maximum length of all headers. If the sum of the length of each * header exceeds this value, a {@link TooLongFrameException} will be raised.
{@code maxChunkSize}	The maximum length of the content or each chunk. If the content length * exceeds this value, the transfer encoding of the decoded request will be * converted to 'chunked' and the content will be split into multiple * {@link HttpChunk}s. If the transfer encoding of the HTTP request is * 'chunked' already, each chunk will be split into smaller chunks if the * length of the chunk exceeds this value. If you prefer not to handle * {@link HttpChunk}s in your handler, insert {@link HttpChunkAggregator} * after this decoder in the {@link ChannelPipeline}.