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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  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 org.eclipse.jetty.http;

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

import org.eclipse.jetty.util.ArrayTrie;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.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 final static 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);
    }
}