org.eclipse.jetty.http.HttpVersion Maven / Gradle / Ivy
//
// ========================================================================
// 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 org.eclipse.jetty.util.ArrayTrie;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.Trie;
/* ------------------------------------------------------------------------------- */
public enum HttpVersion
{
HTTP_0_9("HTTP/0.9",9),
HTTP_1_0("HTTP/1.0",10),
HTTP_1_1("HTTP/1.1",11),
HTTP_2("HTTP/2.0",20);
/* ------------------------------------------------------------ */
public final static Trie CACHE= new ArrayTrie();
static
{
for (HttpVersion version : HttpVersion.values())
CACHE.put(version.toString(),version);
}
/* ------------------------------------------------------------ */
/**
* Optimised lookup to find a Http Version and whitespace in a byte array.
* @param bytes Array containing ISO-8859-1 characters
* @param position The first valid index
* @param limit The first non valid index
* @return A HttpMethod if a match or null if no easy match.
*/
public static HttpVersion lookAheadGet(byte[] bytes, int position, int limit)
{
int length=limit-position;
if (length<9)
return null;
if (bytes[position+4]=='/' && bytes[position+6]=='.' && Character.isWhitespace((char)bytes[position+8]) &&
((bytes[position]=='H' && bytes[position+1]=='T' && bytes[position+2]=='T' && bytes[position+3]=='P') ||
(bytes[position]=='h' && bytes[position+1]=='t' && bytes[position+2]=='t' && bytes[position+3]=='p')))
{
switch(bytes[position+5])
{
case '1':
switch(bytes[position+7])
{
case '0':
return HTTP_1_0;
case '1':
return HTTP_1_1;
}
break;
case '2':
switch(bytes[position+7])
{
case '0':
return HTTP_2;
}
break;
}
}
return null;
}
/* ------------------------------------------------------------ */
/**
* Optimised lookup to find a HTTP Version and trailing white space in a byte array.
* @param buffer buffer containing ISO-8859-1 characters
* @return A HttpVersion if a match or null if no easy match.
*/
public static HttpVersion lookAheadGet(ByteBuffer buffer)
{
if (buffer.hasArray())
return lookAheadGet(buffer.array(),buffer.arrayOffset()+buffer.position(),buffer.arrayOffset()+buffer.limit());
return null;
}
private final String _string;
private final byte[] _bytes;
private final ByteBuffer _buffer;
private final int _version;
/* ------------------------------------------------------------ */
HttpVersion(String s,int version)
{
_string=s;
_bytes=StringUtil.getBytes(s);
_buffer=ByteBuffer.wrap(_bytes);
_version=version;
}
/* ------------------------------------------------------------ */
public byte[] toBytes()
{
return _bytes;
}
/* ------------------------------------------------------------ */
public ByteBuffer toBuffer()
{
return _buffer.asReadOnlyBuffer();
}
/* ------------------------------------------------------------ */
public int getVersion()
{
return _version;
}
/* ------------------------------------------------------------ */
public boolean is(String s)
{
return _string.equalsIgnoreCase(s);
}
/* ------------------------------------------------------------ */
public String asString()
{
return _string;
}
/* ------------------------------------------------------------ */
@Override
public String toString()
{
return _string;
}
/**
* Case insensitive fromString() conversion
* @param version the String to convert to enum constant
* @return the enum constant or null if version unknown
*/
public static HttpVersion fromString(String version)
{
return CACHE.get(version);
}
/* ------------------------------------------------------------ */
public static HttpVersion fromVersion(int version)
{
switch(version)
{
case 9: return HttpVersion.HTTP_0_9;
case 10: return HttpVersion.HTTP_1_0;
case 11: return HttpVersion.HTTP_1_1;
case 20: return HttpVersion.HTTP_2;
default: throw new IllegalArgumentException();
}
}
}