1 /*
   2  * Copyright (c) 2015, 2016, 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.incubator.http.internal.frame;
  27 
  28 import jdk.incubator.http.internal.common.ByteBufferReference;
  29 import jdk.incubator.http.internal.common.Utils;
  30 
  31 public class PushPromiseFrame extends HeaderFrame {
  32 
  33     private int padLength;
  34     private final int promisedStream;
  35 
  36     public static final int TYPE = 0x5;
  37 
  38     // Flags
  39     public static final int END_HEADERS = 0x4;
  40     public static final int PADDED = 0x8;
  41 
  42     public PushPromiseFrame(int streamid, int flags, int promisedStream, ByteBufferReference[] buffers, int padLength) {
  43         super(streamid, flags, buffers);
  44         this.promisedStream = promisedStream;
  45         if(padLength > 0 ) {
  46             setPadLength(padLength);
  47         }
  48     }
  49 
  50     @Override
  51     public int type() {
  52         return TYPE;
  53     }
  54 
  55     @Override
  56     int length() {
  57         return headerLength + ((flags & PADDED) != 0 ? 5 : 4);
  58     }
  59 
  60     @Override
  61     public String toString() {
  62         return super.toString() + " promisedStreamid: " + promisedStream
  63                 + " headerLength: " + headerLength;
  64     }
  65 
  66     @Override
  67     public String flagAsString(int flag) {
  68         switch (flag) {
  69             case PADDED:
  70                 return "PADDED";
  71             case END_HEADERS:
  72                 return "END_HEADERS";
  73         }
  74         return super.flagAsString(flag);
  75     }
  76 
  77     public void setPadLength(int padLength) {
  78         this.padLength = padLength;
  79         flags |= PADDED;
  80     }
  81 
  82     public int getPadLength() {
  83         return padLength;
  84     }
  85 
  86     public int getPromisedStream() {
  87         return promisedStream;
  88     }
  89 
  90     @Override
  91     public boolean endHeaders() {
  92         return getFlag(END_HEADERS);
  93     }
  94 
  95 }