binaryinputpattern.java

基于人工免疫原理的入侵检测系统框架

/*=================
 * Copyright (C) 2001  Todd Kaplan
 *
 * Lisys is a program that monitors TCP SYN packets to detect network
 * traffic anomalies.
 *
 * Licensed under the GNU General Public License (GPL), version 2 or
 * higher.  Please see the COPYING and PATENT files included with the
 * Lisys distribution, which can be found at:
 *
 *   http://www.cs.unm.edu/~judd/lisys/
 *
 * Also, the current text of the GPL can be found at: 
 *
 *   http://www.gnu.org/copyleft/gpl.html
 * 
 * Note that Lisys has NO WARRANTY!
 *=================*/

package edu.unm.cs.lisys.detection.bip;

import edu.unm.cs.lisys.util.*;
import java.util.*;
import java.io.*;

/**========== 
 * BinaryInputPattern.java
 *   A string a bits that represents both TCP connections * and
 *   detectors.
 *
 * Here are the people who have worked on this code in the order they
 * have worked on it:
 *   @author Todd Kaplan <[e-mail]>
 *   @author Justin Balthrop <[e-mail]>
 *==========*/
public abstract class BinaryInputPattern implements Cloneable, Serializable
{
    static final long serialVersionUID = 179432837854725317L;
    protected BitSet binaryString;
    
    public BinaryInputPattern() { }
    
    public BinaryInputPattern(BitSet bits)
    {
	constructBinaryString(bits);
    }
    
    /**========== 
     * constructBinaryString:
     *   Randomly creates a BIP.
     *==========*/
    public abstract BinaryInputPattern constructBinaryString(KnuthRandom random);
    
    /**==========
     * constructBinaryString:
     *   Creates BIP by extracting appropriate info from supplied string.
     *==========*/
    public abstract BinaryInputPattern constructBinaryString(String s);
    
    /**==========
     * constructBinaryString:
     *   Creates BIP using the supplied BitSet.
     *==========*/
    public BinaryInputPattern constructBinaryString(BitSet bs)
    {
	this.binaryString = bs;
	return this;
    }
    
    public abstract String toString();
    
    public abstract String getConstructorString();
    
    public BitSet getBinaryString()
    {
	return binaryString;
    }
    
    public void setBinaryString(BitSet bits)
    {
	this.binaryString = bits;
    }

    abstract public int getLength();

    /**==========
     * clone:
     *   @return an exact copy of the current BIP
     *==========*/
    public Object clone()
    {
	BinaryInputPattern bip;
	try {
	    Class c = Class.forName(this.getClass().getName());
	    bip = (BinaryInputPattern) c.newInstance();
	    bip.setBinaryString(this.binaryString);
	    return bip;
	}
	catch (Exception e) {
	    System.err.println(this.toString() + ": " + e);
	}
	
	return new String("clone failed");
    }
}