com.fireflysource.net.http.common.v2.frame.PingFrame Maven / Gradle / Ivy
package com.fireflysource.net.http.common.v2.frame;
import java.util.Objects;
public class PingFrame extends Frame {
public static final int PING_LENGTH = 8;
private static final byte[] EMPTY_PAYLOAD = new byte[8];
private final byte[] payload;
private final boolean reply;
/**
* Creates a PING frame with an empty payload.
*
* @param reply whether this PING frame is a reply
*/
public PingFrame(boolean reply) {
this(EMPTY_PAYLOAD, reply);
}
/**
* Creates a PING frame with the given {@code long} {@code value} as payload.
*
* @param value the value to use as a payload for this PING frame
* @param reply whether this PING frame is a reply
*/
public PingFrame(long value, boolean reply) {
this(toBytes(value), reply);
}
/**
* Creates a PING frame with the given {@code payload}.
*
* @param payload the payload for this PING frame
* @param reply whether this PING frame is a reply
*/
public PingFrame(byte[] payload, boolean reply) {
super(FrameType.PING);
this.payload = Objects.requireNonNull(payload);
if (payload.length != PING_LENGTH)
throw new IllegalArgumentException("PING payload must be 8 bytes");
this.reply = reply;
}
private static byte[] toBytes(long value) {
byte[] result = new byte[8];
for (int i = result.length - 1; i >= 0; --i) {
result[i] = (byte) (value & 0xFF);
value >>= 8;
}
return result;
}
private static long toLong(byte[] payload) {
long result = 0;
for (int i = 0; i < 8; ++i) {
result <<= 8;
result |= (payload[i] & 0xFF);
}
return result;
}
public byte[] getPayload() {
return payload;
}
public long getPayloadAsLong() {
return toLong(payload);
}
public boolean isReply() {
return reply;
}
}