1/*
2 * Copyright (c) 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 */
25package jdk.incubator.http.internal.hpack;
26
27import java.nio.ByteBuffer;
28import java.util.Iterator;
29
30import static java.util.Objects.requireNonNull;
31
32final 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}
79