package org.apache.http;

import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;

@Contract(
   threading = ThreadingBehavior.IMMUTABLE
)
public final class HttpVersion extends ProtocolVersion {
   private static final long serialVersionUID = -5856653513894415344L;
   public static final String HTTP = "HTTP";
   public static final HttpVersion HTTP_0_9 = new HttpVersion(0, 9);
   public static final HttpVersion HTTP_1_0 = new HttpVersion(1, 0);
   public static final HttpVersion HTTP_1_1 = new HttpVersion(1, 1);

   public HttpVersion(int major, int minor) {
      super("HTTP", major, minor);
   }

   public ProtocolVersion forVersion(int major, int minor) {
      if (major == this.major && minor == this.minor) {
         return this;
      } else {
         if (major == 1) {
            if (minor == 0) {
               return HTTP_1_0;
            }

            if (minor == 1) {
               return HTTP_1_1;
            }
         }

         return major == 0 && minor == 9 ? HTTP_0_9 : new HttpVersion(major, minor);
      }
   }
}
