Jetty example source code file (HttpHeaderValues.java)

This example Jetty source code file (HttpHeaderValues.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

buffer, bytes, httpheadervalues, httpheadervalues, identity, io, keep_alive, linenumberreader, linenumberreader, processing_ordinal, processing_ordinal=7, string, string, te, te

The Jetty HttpHeaderValues.java source code

// ========================================================================
// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed 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.mortbay.jetty;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;

import org.mortbay.io.Buffer;
import org.mortbay.io.BufferCache;
import org.mortbay.io.ByteArrayBuffer;
import org.mortbay.log.Log;

/**
 * Cached HTTP Header values.
 * This class caches the conversion of common HTTP Header values to and from {@link ByteArrayBuffer} instances.
 * The resource "/org/mortbay/jetty/useragents" is checked for a list of common user agents, so that repeated
 * creation of strings for these agents can be avoided.
 * 
 * @author gregw
 */
public class HttpHeaderValues extends BufferCache
{
    public final static String
        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";

    public final static int
        CLOSE_ORDINAL=1,
        CHUNKED_ORDINAL=2,
        GZIP_ORDINAL=3,
        IDENTITY_ORDINAL=4,
        KEEP_ALIVE_ORDINAL=5,
        CONTINUE_ORDINAL=6,
        PROCESSING_ORDINAL=7,
        TE_ORDINAL=8,
        BYTES_ORDINAL=9,
        NO_CACHE_ORDINAL=10;
    
    public final static HttpHeaderValues CACHE= new HttpHeaderValues();

    public final static Buffer 
        CLOSE_BUFFER=CACHE.add(CLOSE,CLOSE_ORDINAL),
        CHUNKED_BUFFER=CACHE.add(CHUNKED,CHUNKED_ORDINAL),
        GZIP_BUFFER=CACHE.add(GZIP,GZIP_ORDINAL),
        IDENTITY_BUFFER=CACHE.add(IDENTITY,IDENTITY_ORDINAL),
        KEEP_ALIVE_BUFFER=CACHE.add(KEEP_ALIVE,KEEP_ALIVE_ORDINAL),
        CONTINUE_BUFFER=CACHE.add(CONTINUE, CONTINUE_ORDINAL),
        PROCESSING_BUFFER=CACHE.add(PROCESSING, PROCESSING_ORDINAL),
        TE_BUFFER=CACHE.add(TE,TE_ORDINAL),
        BYTES_BUFFER=CACHE.add(BYTES,BYTES_ORDINAL),
        NO_CACHE_BUFFER=CACHE.add(NO_CACHE,NO_CACHE_ORDINAL);
        
    static
    {  
        int index=100;
        CACHE.add("gzip",index++);
        CACHE.add("gzip,deflate",index++);
        CACHE.add("deflate",index++);
        
        try
        {
            InputStream ua = HttpHeaderValues.class.getResourceAsStream("/org/mortbay/jetty/useragents");
            if (ua!=null)
            {
                LineNumberReader in = new LineNumberReader(new InputStreamReader(ua));
                String line = in.readLine();
                while (line!=null)
                {
                    CACHE.add(line,index++);
                    line = in.readLine();
                }
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
            Log.ignore(e);
        }
    }
}