/*

 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.nio.ByteBuffer;

import java.util.List;

/**

 * Either a HeadersFrame or a ContinuationFrame

 */

public abstract class HeaderFrame extends Http2Frame {

    final int headerLength;

    final List<ByteBuffer> headerBlocks;

    public static final int END_STREAM = 0x1;

    public static final int END_HEADERS = 0x4;

    public HeaderFrame(int streamid, int flags, List<ByteBuffer> headerBlocks) {

        super(streamid, flags);

        this.headerBlocks = headerBlocks;

        this.headerLength = Utils.remaining(headerBlocks, Integer.MAX_VALUE);

    }

    @Override

    public String flagAsString(int flag) {

        switch (flag) {

            case END_HEADERS:

                return "END_HEADERS";

            case END_STREAM:

                return "END_STREAM";

        }

        return super.flagAsString(flag);

    }

    public List<ByteBuffer> getHeaderBlock() {

        return headerBlocks;

    }

    int getHeaderLength() {

        return headerLength;

    }

    /**

     * Returns true if this block is the final block of headers.

     */

    public boolean endHeaders() {

        return getFlag(END_HEADERS);

    }

}