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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.http.api;
    21
    22  /**
    23   * Type safe enumeration representing HTTP protocol version
    24   *
    25   * @author The Apache MINA Project (dev@mina.apache.org)
    26   */
    27  public enum HttpVersion {
    28      /**
    29       * HTTP 1/1
    30       */
    31      HTTP_1_1("HTTP/1.1"),
    32
    33      /**
    34       * HTTP 1/0
    35       */
    36      HTTP_1_0("HTTP/1.0");
    37
    38      private final String value;
    39
    40      private HttpVersion(String value) {
    41          this.value = value;
    42      }
    43
    44      /**
    45       * Returns the {@link HttpVersion} instance from the specified string.
    46       *
    47       * @return The version, or <code>null</code> if no version is found
    48       */
    49      public static HttpVersion fromString(String string) {
    50          if (HTTP_1_1.toString().equalsIgnoreCase(string)) {
    51              return HTTP_1_1;
    52          }
    53
    54          if (HTTP_1_0.toString().equalsIgnoreCase(string)) {
    55              return HTTP_1_0;
    56          }
    57
    58          return null;
    59      }
    60
    61      /**
    62       * @return A String representation of this version
    63       */
    64      @Override
    65      public String toString() {
    66          return value;
    67      }
    68
    69  }