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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.http;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
/**
* Represents an HTTP version. HTTP uses a "major.minor" numbering
* scheme to indicate versions of the protocol.
*
* The version of an HTTP message is indicated by an HTTP-Version field
* in the first line of the message.
*
*
* HTTP-Version = "HTTP" "/" 1*DIGIT "." 1*DIGIT
*
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public final class HttpVersion extends ProtocolVersion {
private static final long serialVersionUID = -5856653513894415344L;
/** The protocol name. */
public static final String HTTP = "HTTP";
/** HTTP protocol version 0.9 */
public static final HttpVersion HTTP_0_9 = new HttpVersion(0, 9);
/** HTTP protocol version 1.0 */
public static final HttpVersion HTTP_1_0 = new HttpVersion(1, 0);
/** HTTP protocol version 1.1 */
public static final HttpVersion HTTP_1_1 = new HttpVersion(1, 1);
/**
* Create an HTTP protocol version designator.
*
* @param major the major version number of the HTTP protocol
* @param minor the minor version number of the HTTP protocol
*
* @throws IllegalArgumentException if either major or minor version number is negative
*/
public HttpVersion(final int major, final int minor) {
super(HTTP, major, minor);
}
/**
* Obtains a specific HTTP version.
*
* @param major the major version
* @param minor the minor version
*
* @return an instance of {@link HttpVersion} with the argument version
*/
@Override
public ProtocolVersion forVersion(final int major, final int minor) {
if ((major == this.major) && (minor == this.minor)) {
return this;
}
if (major == 1) {
if (minor == 0) {
return HTTP_1_0;
}
if (minor == 1) {
return HTTP_1_1;
}
}
if ((major == 0) && (minor == 9)) {
return HTTP_0_9;
}
// argument checking is done in the constructor
return new HttpVersion(major, minor);
}
}