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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2014 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.spdy;

import org.jboss.netty.buffer.ChannelBuffer;

abstract class SpdyHeaderBlockDecoder {

    static SpdyHeaderBlockDecoder newInstance(SpdyVersion spdyVersion, int maxHeaderSize) {
        return new SpdyHeaderBlockZlibDecoder(spdyVersion, maxHeaderSize);
    }

    /**
     * Decodes a SPDY Header Block, adding the Name/Value pairs to the given Headers frame.
     * If the header block is malformed, the Headers frame will be marked as invalid.
     * A stream error with status code PROTOCOL_ERROR must be issued in response to an invalid frame.
     *
     * @param headerBlock the HeaderBlock to decode
     * @param frame the Headers frame that receives the Name/Value pairs
     * @throws Exception If the header block is malformed in a way that prevents any future
     *                   decoding of any other header blocks, an exception will be thrown.
     *                   A session error with status code PROTOCOL_ERROR must be issued.
     */
    abstract void decode(ChannelBuffer headerBlock, SpdyHeadersFrame frame) throws Exception;

    abstract void endHeaderBlock(SpdyHeadersFrame frame) throws Exception;

    abstract void end();
}