Java JScan类代码示例

import org.jnetpcap.packet.JScan; //导入依赖的package包/类
/**
 * Validate signature.
 * 
 * @param method
 *          the method
 * @see org.jnetpcap.packet.structure.AnnotatedMethod#validateSignature(java.lang.reflect.Method)
 */
@Override
protected void validateSignature(Method method) {
	final Class<?> declaringClass = method.getDeclaringClass();

	if (method.isAnnotationPresent(Scanner.class) == false) {
		throw new AnnotatedMethodException(declaringClass,
		    "@Scanner annotation missing for " + method.getName() + "()");
	}

	/*
	 * Now make sure it has the right signature of: <code>static int
	 * name(JBuffer, int)</code.
	 */
	final Class<?>[] sig = method.getParameterTypes();
	if (sig.length != 1 || sig[0] != JScan.class) {
		throw new AnnotatedMethodException(declaringClass,
		    "Invalid signature for " + method.getName() + "()");
	}

	if (object == null && (method.getModifiers() & Modifier.STATIC) == 0) {
		throw new AnnotatedMethodException(declaringClass, method.getName()
		    + "()" + " must be declared static");
	}
}
 

import org.jnetpcap.packet.JScan; //导入依赖的package包/类
/**
 * Scanner.
 * 
 * @param scan
 *          the scan
 */
@Scanner
public static void scanner(JScan scan) {

	/*
	 * Packet extends JBuffer. The packet object is the one that is already
	 * created for the scanner in the Pcap.loop call and is already peered. This
	 * is better approach than getting the buffer with: JBuffer b = new
	 * JBuffer(Type.POINTER); scan.scan_buf(b);
	 */
	JPacket packet = scan.scan_packet();

	/*
	 * Thats good
	 */
	int offset = scan.scan_offset();

	/*
	 * Should put this outside the method body as a private field. Do it once
	 * everytime the header is created.
	 */
	@SuppressWarnings("unused")
	int id = JRegistry.lookupId(IEEE802dot11_RADIOTAP.class);

	// JRegistry.lookupId(IEEE802dot11.class);

	/*
	 * Good. Exactly why @HeaderLength methods are static
	 */
	scan.scan_length(getHeaderLength(packet, offset));

	/*
	 * Now here the scan_id is already set, otherwise this @Scanner method would
	 * not be getting called. What you want to set is the next_id which is the
	 * ID of the next header or leave next at PAYLOAD_ID which will force the
	 * JHeaderScanner that called this @Scanner method to also check the reverse
	 * bindings. If you set the next_id to anything other than PAYLOAD or
	 * JScan.END_OF_HEADERS_ID, that id will be used as the next protocol in the
	 * header (another iteration of the loop will make it the current id)
	 */
	// scan.scan_id(id);
	// scan.scan_next_id(next_id);
}