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 java.net.http;
  27 
  28 import java.io.IOException;
  29 import java.nio.ByteBuffer;
  30 
  31 class WindowUpdateFrame extends Http2Frame {
  32 
  33     int windowUpdate;
  34 
  35     WindowUpdateFrame() {
  36         type = TYPE;
  37     }
  38 
  39     public final static int TYPE = 0x8;
  40 
  41     public void setUpdate(int windowUpdate) {
  42         this.windowUpdate = windowUpdate;
  43     }
  44 
  45     @Override
  46     public String toString() {
  47         StringBuilder sb = new StringBuilder();
  48         sb.append(super.toString())
  49           .append(" WindowUpdate: ")
  50           .append(windowUpdate);
  51         return sb.toString();
  52     }
  53 
  54     public int getUpdate() {
  55         return this.windowUpdate;
  56     }
  57 
  58     /**
  59      */
  60     @Override
  61     void readIncomingImpl(ByteBufferConsumer bc) throws IOException {
  62         if (length != 4) {
  63             throw new IOException("Invalid WindowUpdate frame");
  64         }
  65         windowUpdate = bc.getInt() & 0x7fffffff;
  66     }
  67 
  68     @Override
  69     void computeLength() {
  70         length = 4;
  71     }
  72 
  73     @Override
  74     void writeOutgoing(ByteBufferGenerator bg) {
  75         super.writeOutgoing(bg);
  76         ByteBuffer buf = bg.getBuffer(4);
  77         buf.putInt(windowUpdate);
  78     }
  79 }