/*

 * Copyright (c) 2015, 2016, 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.

 */

package java.net.http;

import java.io.IOException;

import java.nio.ByteBuffer;

class DataFrame extends Http2Frame {

    public final static int TYPE = 0x0;

    DataFrame() {

        type = TYPE;

    }

    // Flags

    public static final int END_STREAM = 0x1;

    public static final int PADDED = 0x8;

    int padLength;

    int dataLength;

    ByteBuffer[] data;

    public void setData(ByteBuffer[] data) {

        this.data = data;

        setDataLength();

    }

    @Override

    String flagAsString(int flag) {

        switch (flag) {

        case END_STREAM:

            return "END_STREAM";

        case PADDED:

            return "PADDED";

        }

        return super.flagAsString(flag);

    }

    public synchronized void setData(ByteBuffer data) {

        ByteBuffer[] bb;

        if (data == null) {

            bb = new ByteBuffer[0];

        } else {

            bb = new ByteBuffer[1];

            bb[0] = data;

        }

        setData(bb);

    }

    public synchronized ByteBuffer[] getData() {

        return data;

    }

    private void setDataLength() {

        int len = 0;

        for (ByteBuffer buf : data) {

            len += buf.remaining();

        }

        dataLength = len;

    }

    @Override

    void readIncomingImpl(ByteBufferConsumer bc) throws IOException {

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

            padLength = bc.getByte();

            dataLength = length - (padLength + 1);

        } else {

            dataLength = length;

        }

        data = bc.getBuffers(dataLength);

    }

    int getPadLength() {

        return padLength;

    }

    int getDataLength() {

        return dataLength;

    }

    @Override

    void writeOutgoing(ByteBufferGenerator bg) {

        super.writeOutgoing(bg);

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

            ByteBuffer buf = bg.getBuffer(1);

            buf.put((byte)getPadLength());

        }

        for (int i=0; i<data.length; i++) {

            bg.addByteBuffer(data[i]);

        }

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

            bg.addPadding(padLength);

        }

    }

    @Override

    void computeLength() {

        length = dataLength;

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

            length += (1 + padLength);

        }

    }

}