package ir.webutils;import java.net.*;/** * Link is a class that contains a URL.  Subclasses of link may keep * additional information (such as anchor text & other attributes) * * @author Ted Wild and Ray Mooney */public class Link {    private URL url = null;    /**      * May be subclassed.  This constructor should not be invoked by     * clients of <code>Link</code>.  */    protected Link() {	url = null;    }    /** Constructs a link with specified URL.     *     * @param url The URL for this link.  */    public Link(URL url) {	this.url = cleanURL(url);    }    /** Construct a link with specified URL string */    public Link(String urlName) {	try {	    this.url = cleanURL(new URL(urlName));	}	catch (MalformedURLException e) {	    System.err.println("Bad URL: " +  urlName);	}    }        /**     * Returns the URL of this link.       *     * @return The URL of this link. */    public final URL getURL() {	return url;    }    public String toString() {	return url.toString();    }    public boolean equals(Object o) {	return (o instanceof Link) && ((Link) o).url.equals(this.url);    }    public int hashCode() {	return url.hashCode();    }    /** Standardize URL */    public static URL cleanURL(URL url) {	return removeEndSlash(removeRef(url));    }    /** Removes slash at end of URL to normalize */    public static URL removeEndSlash(URL url) {	String name = url.toString();	if (name.charAt(name.length() - 1) == '/')	    try {		return new URL(name.substring(0, name.length() - 1));	    }	    catch (MalformedURLException e) {		System.err.println("Bad URL: " +  name);	    }	return url;    }        /** Remove the internal "ref" pointer in a URL if there is     * one. This not part of the URL to a page itself */    public static URL removeRef(URL url) {	String ref = url.getRef();	if (ref == null || ref.equals(""))	    return url;	String urlName = url.toString();	int pos = urlName.lastIndexOf("#");	if (pos >= 0) 	    try {		return (new URL(urlName.substring(0,pos)));	    }	    catch (MalformedURLException e) {		System.err.println("Bad Ref in URL: " +  urlName);	    }	return url;    }    public static void main (String[] args) {	System.out.println(new Link(args[0]));    }		}// Link