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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2012-2014 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import java.io.ObjectStreamException;
import org.pcap4j.packet.TcpPacket.TcpOption;
import org.pcap4j.packet.namednumber.TcpOptionKind;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 0.9.12
*/
public final class TcpNoOperationOption implements TcpOption {
/*
* +--------+
* |00000001|
* +--------+
* Kind=1
*/
/** */
private static final long serialVersionUID = -3555140079365778548L;
private static final TcpNoOperationOption INSTANCE = new TcpNoOperationOption();
private static final TcpOptionKind kind = TcpOptionKind.NO_OPERATION;
private TcpNoOperationOption() {}
/** @return the singleton instance of TcpNoOperationOption. */
public static TcpNoOperationOption getInstance() {
return INSTANCE;
}
/**
* A static factory method. This method validates the arguments by {@link
* ByteArrays#validateBounds(byte[], int, int)}, which may throw exceptions undocumented here.
*
* @param rawData rawData
* @param offset offset
* @param length length
* @return the singleton instance of TcpNoOperationOption.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static TcpNoOperationOption newInstance(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
if (rawData[offset] != kind.value()) {
StringBuilder sb = new StringBuilder(100);
sb.append("The kind must be: ")
.append(kind.valueAsString())
.append(" rawData: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
return INSTANCE;
}
@Override
public TcpOptionKind getKind() {
return kind;
}
@Override
public int length() {
return 1;
}
@Override
public byte[] getRawData() {
return new byte[] {(byte) 1};
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("[Kind: ").append(kind);
sb.append("]");
return sb.toString();
}
// Override deserializer to keep singleton
@SuppressWarnings("static-method")
private Object readResolve() throws ObjectStreamException {
return INSTANCE;
}
}
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