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  */
  24 
  25 package java.net.http;
  26 
  27 import java.io.IOException;
  28 import java.nio.ByteBuffer;
  29 
  30 class WindowUpdateFrame extends Http2Frame {
  31 
  32     int windowUpdate;
  33 
  34     WindowUpdateFrame() {
  35         type = TYPE;
  36     }
  37 
  38     public final static int TYPE = 0x8;
  39 
  40     public void setUpdate(int windowUpdate) {
  41         this.windowUpdate = windowUpdate;
  42     }
  43 
  44     @Override
  45     public String toString() {
  46         StringBuilder sb = new StringBuilder();
  47         sb.append(super.toString())
  48           .append(" WindowUpdate: ")
  49           .append(windowUpdate);
  50         return sb.toString();
  51     }
  52 
  53     public int getUpdate() {
  54         return this.windowUpdate;
  55     }
  56 
  57     /**
  58      */
  59     @Override
  60     void readIncomingImpl(ByteBufferConsumer bc) throws IOException {
  61         if (length != 4) {
  62             throw new IOException("Invalid WindowUpdate frame");
  63         }
  64         windowUpdate = bc.getInt() & 0x7fffffff;
  65     }
  66 
  67     @Override
  68     void setLength() {
  69         length = 4;
  70     }
  71 
  72     @Override
  73     void writeOutgoing(ByteBufferGenerator bg) {
  74         super.writeOutgoing(bg);
  75         ByteBuffer buf = bg.getBuffer(4);
  76         buf.putInt(windowUpdate);
  77     }
  78 }