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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 2013 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.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpMessage;

/**
 * Provides the constants for the header names and the utility methods
 * used by the {@link SpdyHttpDecoder} and {@link SpdyHttpEncoder}.
 * @apiviz.stereotype static
 */
public final class SpdyHttpHeaders {

    /**
     * SPDY HTTP header names
     * @apiviz.stereotype static
     */
    public static final class Names {
        /**
         * {@code "X-SPDY-Stream-ID"}
         */
        public static final String STREAM_ID = "X-SPDY-Stream-ID";
        /**
         * {@code "X-SPDY-Associated-To-Stream-ID"}
         */
        public static final String ASSOCIATED_TO_STREAM_ID = "X-SPDY-Associated-To-Stream-ID";
        /**
         * {@code "X-SPDY-Priority"}
         */
        public static final String PRIORITY = "X-SPDY-Priority";
        /**
         * {@code "X-SPDY-URL"}
         */
        public static final String URL = "X-SPDY-URL";
        /**
         * {@code "X-SPDY-Scheme"}
         */
        public static final String SCHEME = "X-SPDY-Scheme";

        private Names() {
        }
    }

    private SpdyHttpHeaders() {
    }

    /**
     * Removes the {@code "X-SPDY-Stream-ID"} header.
     */
    public static void removeStreamId(HttpMessage message) {
        message.headers().remove(Names.STREAM_ID);
    }

    /**
     * Returns the value of the {@code "X-SPDY-Stream-ID"} header.
     */
    public static int getStreamId(HttpMessage message) {
        return HttpHeaders.getIntHeader(message, Names.STREAM_ID);
    }

    /**
     * Sets the {@code "X-SPDY-Stream-ID"} header.
     */
    public static void setStreamId(HttpMessage message, int streamId) {
        HttpHeaders.setIntHeader(message, Names.STREAM_ID, streamId);
    }

    /**
     * Removes the {@code "X-SPDY-Associated-To-Stream-ID"} header.
     */
    public static void removeAssociatedToStreamId(HttpMessage message) {
        message.headers().remove(Names.ASSOCIATED_TO_STREAM_ID);
    }

    /**
     * Returns the value of the {@code "X-SPDY-Associated-To-Stream-ID"} header.
     *
     * @return the header value or {@code 0} if there is no such header or
     *         if the header value is not a number
     */
    public static int getAssociatedToStreamId(HttpMessage message) {
        return HttpHeaders.getIntHeader(message, Names.ASSOCIATED_TO_STREAM_ID, 0);
    }

    /**
     * Sets the {@code "X-SPDY-Associated-To-Stream-ID"} header.
     */
    public static void setAssociatedToStreamId(HttpMessage message, int associatedToStreamId) {
        HttpHeaders.setIntHeader(message, Names.ASSOCIATED_TO_STREAM_ID, associatedToStreamId);
    }

    /**
     * Removes the {@code "X-SPDY-Priority"} header.
     */
    public static void removePriority(HttpMessage message) {
        message.headers().remove(Names.PRIORITY);
    }

    /**
     * Returns the value of the {@code "X-SPDY-Priority"} header.
     *
     * @return the header value or {@code 0} if there is no such header or
     *         if the header value is not a number
     */
    public static byte getPriority(HttpMessage message) {
        return (byte) HttpHeaders.getIntHeader(message, Names.PRIORITY, 0);
    }

    /**
     * Sets the {@code "X-SPDY-Priority"} header.
     */
    public static void setPriority(HttpMessage message, byte priority) {
        HttpHeaders.setIntHeader(message, Names.PRIORITY, priority);
    }

    /**
     * Removes the {@code "X-SPDY-URL"} header.
     */
    public static void removeUrl(HttpMessage message) {
        message.headers().remove(Names.URL);
    }

    /**
     * Returns the value of the {@code "X-SPDY-URL"} header.
     */
    public static String getUrl(HttpMessage message) {
        return message.headers().get(Names.URL);
    }

    /**
     * Sets the {@code "X-SPDY-URL"} header.
     */
    public static void setUrl(HttpMessage message, String url) {
        message.headers().set(Names.URL, url);
    }

    /**
     * Removes the {@code "X-SPDY-Scheme"} header.
     */
    public static void removeScheme(HttpMessage message) {
        message.headers().remove(Names.SCHEME);
    }

    /**
     * Returns the value of the {@code "X-SPDY-Scheme"} header.
     */
    public static String getScheme(HttpMessage message) {
        return message.headers().get(Names.SCHEME);
    }

    /**
     * Sets the {@code "X-SPDY-Scheme"} header.
     */
    public static void setScheme(HttpMessage message, String scheme) {
        message.headers().set(Names.SCHEME, scheme);
    }
}