1 /*

     2  * Copyright (c) 2016, 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 package java.net.http.internal.hpack;

    26 

    27 import java.nio.ByteBuffer;

    28 import java.util.Iterator;

    29 

    30 import static java.util.Objects.requireNonNull;

    31 

    32 final class BulkSizeUpdateWriter implements BinaryRepresentationWriter {

    33 

    34     private final SizeUpdateWriter writer = new SizeUpdateWriter();

    35     private Iterator<Integer> maxSizes;

    36     private boolean writing;

    37     private boolean configured;

    38 

    39     BulkSizeUpdateWriter maxHeaderTableSizes(Iterable<Integer> sizes) {

    40         if (configured) {

    41             throw new IllegalStateException("Already configured");

    42         }

    43         requireNonNull(sizes, "sizes");

    44         maxSizes = sizes.iterator();

    45         configured = true;

    46         return this;

    47     }

    48 

    49     @Override

    50     public boolean write(HeaderTable table, ByteBuffer destination) {

    51         if (!configured) {

    52             throw new IllegalStateException("Configure first");

    53         }

    54         while (true) {

    55             if (writing) {

    56                 if (!writer.write(table, destination)) {

    57                     return false;

    58                 }

    59                 writing = false;

    60             } else if (maxSizes.hasNext()) {

    61                 writing = true;

    62                 writer.reset();

    63                 writer.maxHeaderTableSize(maxSizes.next());

    64             } else {

    65                 configured = false;

    66                 return true;

    67             }

    68         }

    69     }

    70 

    71     @Override

    72     public BulkSizeUpdateWriter reset() {

    73         maxSizes = null;

    74         writing = false;

    75         configured = false;

    76         return this;

    77     }

    78 }