/*

 * 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.frame;

import jdk.incubator.http.internal.common.Utils;

import java.nio.ByteBuffer;

import java.util.List;

public class DataFrame extends Http2Frame {

    public static final int TYPE = 0x0;

    // Flags

    public static final int END_STREAM = 0x1;

    public static final int PADDED = 0x8;

    private int padLength;

    private final List<ByteBuffer> data;

    private final int dataLength;

    public DataFrame(int streamid, int flags, ByteBuffer data) {

        this(streamid, flags, List.of(data));

    }

    public DataFrame(int streamid, int flags, List<ByteBuffer> data) {

        super(streamid, flags);

        this.data = data;

        this.dataLength = Utils.remaining(data, Integer.MAX_VALUE);

    }

    public DataFrame(int streamid, int flags, List<ByteBuffer> data, int padLength) {

        this(streamid, flags, data);

        if (padLength > 0) {

            setPadLength(padLength);

        }

    }

    @Override

    public int type() {

        return TYPE;

    }

    @Override

    int length() {

        return dataLength + (((flags & PADDED) != 0) ? (padLength + 1) : 0);

    }

    @Override

    public String flagAsString(int flag) {

        switch (flag) {

        case END_STREAM:

            return "END_STREAM";

        case PADDED:

            return "PADDED";

        }

        return super.flagAsString(flag);

    }

    public List<ByteBuffer> getData() {

        return data;

    }

    public int getDataLength() {

        return dataLength;

    }

    int getPadLength() {

        return padLength;

    }

    public void setPadLength(int padLength) {

        this.padLength = padLength;

        flags |= PADDED;

    }

    public int payloadLength() {

        // RFC 7540 6.1:

        // The entire DATA frame payload is included in flow control,

        // including the Pad Length and Padding fields if present

        if ((flags & PADDED) != 0) {

            return dataLength + (1 + padLength);

        } else {

            return dataLength;

        }

    }

}