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Dropwizard Codahale metrics plugin for signalfx

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//
//  ========================================================================
//  Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package com.signalfx.shaded.jetty.http;

import java.nio.ByteBuffer;
import java.util.EnumSet;

import com.signalfx.shaded.jetty.util.ArrayTrie;
import com.signalfx.shaded.jetty.util.BufferUtil;
import com.signalfx.shaded.jetty.util.Trie;

/**
 *
 */
public enum HttpHeaderValue
{
    CLOSE("close"),
    CHUNKED("chunked"),
    GZIP("gzip"),
    IDENTITY("identity"),
    KEEP_ALIVE("keep-alive"),
    CONTINUE("100-continue"),
    PROCESSING("102-processing"),
    TE("TE"),
    BYTES("bytes"),
    NO_CACHE("no-cache"),
    UPGRADE("Upgrade"),
    UNKNOWN("::UNKNOWN::");

    public static final Trie CACHE = new ArrayTrie();

    static
    {
        for (HttpHeaderValue value : HttpHeaderValue.values())
        {
            if (value != UNKNOWN)
                CACHE.put(value.toString(), value);
        }
    }

    private final String _string;
    private final ByteBuffer _buffer;

    HttpHeaderValue(String s)
    {
        _string = s;
        _buffer = BufferUtil.toBuffer(s);
    }

    public ByteBuffer toBuffer()
    {
        return _buffer.asReadOnlyBuffer();
    }

    public boolean is(String s)
    {
        return _string.equalsIgnoreCase(s);
    }

    public String asString()
    {
        return _string;
    }

    @Override
    public String toString()
    {
        return _string;
    }

    private static EnumSet __known =
        EnumSet.of(HttpHeader.CONNECTION,
            HttpHeader.TRANSFER_ENCODING,
            HttpHeader.CONTENT_ENCODING);

    public static boolean hasKnownValues(HttpHeader header)
    {
        if (header == null)
            return false;
        return __known.contains(header);
    }
}