/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.incubator.http.internal.hpack;

import java.nio.ByteBuffer;

import java.util.Iterator;

import static java.util.Objects.requireNonNull;

final class BulkSizeUpdateWriter implements BinaryRepresentationWriter {

    private final SizeUpdateWriter writer = new SizeUpdateWriter();

    private Iterator<Integer> maxSizes;

    private boolean writing;

    private boolean configured;

    BulkSizeUpdateWriter maxHeaderTableSizes(Iterable<Integer> sizes) {

        if (configured) {

            throw new IllegalStateException("Already configured");

        }

        requireNonNull(sizes, "sizes");

        maxSizes = sizes.iterator();

        configured = true;

        return this;

    }

    @Override

    public boolean write(HeaderTable table, ByteBuffer destination) {

        if (!configured) {

            throw new IllegalStateException("Configure first");

        }

        while (true) {

            if (writing) {

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

                    return false;

                }

                writing = false;

            } else if (maxSizes.hasNext()) {

                writing = true;

                writer.reset();

                writer.maxHeaderTableSize(maxSizes.next());

            } else {

                configured = false;

                return true;

            }

        }

    }

    @Override

    public BulkSizeUpdateWriter reset() {

        maxSizes = null;

        writing = false;

        configured = false;

        return this;

    }

}