1 /*

     2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.internal.net.http.frame;

    27 

    28 /**

    29  * When sending a frame, the length field must be set in sub-class

    30  * by calling computeLength()

    31  */

    32 public abstract class Http2Frame {

    33 

    34     public static final int FRAME_HEADER_SIZE = 9;

    35 

    36     protected int streamid;

    37     protected int flags;

    38 

    39     public Http2Frame(int streamid, int flags) {

    40         this.streamid = streamid;

    41         this.flags = flags;

    42     }

    43 

    44     public int streamid() {

    45         return streamid;

    46     }

    47 

    48     public void setFlag(int flag) {

    49         flags |= flag;

    50     }

    51 

    52     public int getFlags() {

    53         return flags;

    54     }

    55 

    56     public boolean getFlag(int flag) {

    57         return (flags & flag) != 0;

    58     }

    59 

    60 //    public void clearFlag(int flag) {

    61 //        flags &= 0xffffffff ^ flag;

    62 //    }

    63 

    64     public void streamid(int streamid) {

    65         this.streamid = streamid;

    66     }

    67 

    68 

    69     private String typeAsString() {

    70         return asString(type());

    71     }

    72 

    73     public int type() {

    74         return -1; // Unknown type

    75     }

    76 

    77     int length() {

    78         return -1; // Unknown length

    79     }

    80 

    81 

    82     public static String asString(int type) {

    83         switch (type) {

    84           case DataFrame.TYPE:

    85             return "DATA";

    86           case HeadersFrame.TYPE:

    87             return "HEADERS";

    88           case ContinuationFrame.TYPE:

    89             return "CONTINUATION";

    90           case ResetFrame.TYPE:

    91             return "RESET";

    92           case PriorityFrame.TYPE:

    93             return "PRIORITY";

    94           case SettingsFrame.TYPE:

    95             return "SETTINGS";

    96           case GoAwayFrame.TYPE:

    97             return "GOAWAY";

    98           case PingFrame.TYPE:

    99             return "PING";

   100           case PushPromiseFrame.TYPE:

   101             return "PUSH_PROMISE";

   102           case WindowUpdateFrame.TYPE:

   103             return "WINDOW_UPDATE";

   104           default:

   105             return "UNKNOWN";

   106         }

   107     }

   108 

   109     @Override

   110     public String toString() {

   111         StringBuilder sb = new StringBuilder();

   112         sb.append(typeAsString())

   113                 .append(": length=")

   114                 .append(Integer.toString(length()))

   115                 .append(", streamid=")

   116                 .append(streamid)

   117                 .append(", flags=");

   118 

   119         int f = flags;

   120         int i = 0;

   121         if (f == 0) {

   122             sb.append("0 ");

   123         } else {

   124             while (f != 0) {

   125                 if ((f & 1) == 1) {

   126                     sb.append(flagAsString(1 << i))

   127                       .append(' ');

   128                 }

   129                 f = f >> 1;

   130                 i++;

   131             }

   132         }

   133         return sb.toString();

   134     }

   135 

   136     // Override

   137     public String flagAsString(int f) {

   138         return "unknown";

   139     }

   140 

   141 }