michael@0: /*
michael@0:  * ====================================================================
michael@0:  * Licensed to the Apache Software Foundation (ASF) under one
michael@0:  * or more contributor license agreements.  See the NOTICE file
michael@0:  * distributed with this work for additional information
michael@0:  * regarding copyright ownership.  The ASF licenses this file
michael@0:  * to you under the Apache License, Version 2.0 (the
michael@0:  * "License"); you may not use this file except in compliance
michael@0:  * with the License.  You may obtain a copy of the License at
michael@0:  *
michael@0:  *   http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing,
michael@0:  * software distributed under the License is distributed on an
michael@0:  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
michael@0:  * KIND, either express or implied.  See the License for the
michael@0:  * specific language governing permissions and limitations
michael@0:  * under the License.
michael@0:  * ====================================================================
michael@0:  *
michael@0:  * This software consists of voluntary contributions made by many
michael@0:  * individuals on behalf of the Apache Software Foundation.  For more
michael@0:  * information on the Apache Software Foundation, please see
michael@0:  * <http://www.apache.org/>.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: package ch.boye.httpclientandroidlib;
michael@0: 
michael@0: import java.io.Serializable;
michael@0: 
michael@0: /**
michael@0:  * Represents an HTTP version. HTTP uses a "major.minor" numbering
michael@0:  * scheme to indicate versions of the protocol.
michael@0:  * <p>
michael@0:  * The version of an HTTP message is indicated by an HTTP-Version field
michael@0:  * in the first line of the message.
michael@0:  * </p>
michael@0:  * <pre>
michael@0:  *     HTTP-Version   = "HTTP" "/" 1*DIGIT "." 1*DIGIT
michael@0:  * </pre>
michael@0:  *
michael@0:  * @since 4.0
michael@0:  */
michael@0: public final class HttpVersion extends ProtocolVersion
michael@0:     implements Serializable {
michael@0: 
michael@0:     private static final long serialVersionUID = -5856653513894415344L;
michael@0: 
michael@0:     /** The protocol name. */
michael@0:     public static final String HTTP = "HTTP";
michael@0: 
michael@0:     /** HTTP protocol version 0.9 */
michael@0:     public static final HttpVersion HTTP_0_9 = new HttpVersion(0, 9);
michael@0: 
michael@0:     /** HTTP protocol version 1.0 */
michael@0:     public static final HttpVersion HTTP_1_0 = new HttpVersion(1, 0);
michael@0: 
michael@0:     /** HTTP protocol version 1.1 */
michael@0:     public static final HttpVersion HTTP_1_1 = new HttpVersion(1, 1);
michael@0: 
michael@0: 
michael@0:     /**
michael@0:      * Create an HTTP protocol version designator.
michael@0:      *
michael@0:      * @param major   the major version number of the HTTP protocol
michael@0:      * @param minor   the minor version number of the HTTP protocol
michael@0:      *
michael@0:      * @throws IllegalArgumentException if either major or minor version number is negative
michael@0:      */
michael@0:     public HttpVersion(int major, int minor) {
michael@0:         super(HTTP, major, minor);
michael@0:     }
michael@0: 
michael@0: 
michael@0:     /**
michael@0:      * Obtains a specific HTTP version.
michael@0:      *
michael@0:      * @param major     the major version
michael@0:      * @param minor     the minor version
michael@0:      *
michael@0:      * @return  an instance of {@link HttpVersion} with the argument version
michael@0:      */
michael@0:     public ProtocolVersion forVersion(int major, int minor) {
michael@0: 
michael@0:         if ((major == this.major) && (minor == this.minor)) {
michael@0:             return this;
michael@0:         }
michael@0: 
michael@0:         if (major == 1) {
michael@0:             if (minor == 0) {
michael@0:                 return HTTP_1_0;
michael@0:             }
michael@0:             if (minor == 1) {
michael@0:                 return HTTP_1_1;
michael@0:             }
michael@0:         }
michael@0:         if ((major == 0) && (minor == 9)) {
michael@0:             return HTTP_0_9;
michael@0:         }
michael@0: 
michael@0:         // argument checking is done in the constructor
michael@0:         return new HttpVersion(major, minor);
michael@0:     }
michael@0: 
michael@0: }