/*

 * 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 PingFrame extends Http2Frame {

    PingFrame() {

        type = TYPE;

    }

    byte[] data;

    public final static int TYPE = 0x6;

    // Flags

    public static final int ACK = 0x1;

    @Override

    String flagAsString(int flag) {

        switch (flag) {

        case ACK:

            return "ACK";

        }

        return super.flagAsString(flag);

    }

    public void setData(byte[] data) {

        if (data.length != 8) {

            throw new IllegalArgumentException("Ping data not 8 bytes");

        }

        this.data = data;

    }

    public byte[] getData() {

        return data;

    }

    @Override

    void readIncomingImpl(ByteBufferConsumer bc) throws IOException {

        if (length != 8) {

            throw new IOException("Invalid Ping frame");

        }

        data = bc.getBytes(8);

    }

    @Override

    void writeOutgoing(ByteBufferGenerator bg) {

        if (data == null) {

            data = new byte[] {0, 0, 0, 0, 0 ,0, 0, 0};

        }

        super.writeOutgoing(bg);

        ByteBuffer buf = bg.getBuffer(8);

        buf.put(data);

    }

    @Override

    void computeLength() {

        length = 8;

    }

}