/*
 * 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;
    }
}