social-util-library/src/main/java/org/gcube/socialnetworking/token/URLToken.java

package org.gcube.socialnetworking.token;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class URLToken extends ReplaceableToken {
	
	private static String FINAL_CHARACTERS_TO_REMOVE_FROM_LINK = "[\\.\\,\\;\\)\\:]";
	
	public URLToken(String token, String delimiter, int start, int end) {
		super(token, delimiter, start, end);
	}
	
	public URLToken(Token token) {
		super(token);
	}
	
	public static URL isURL(String string) {
		try {
			if(string.startsWith("(")) {
				string = string.substring(1);
			}
			if(string.startsWith("www.")) {
				string = "http://" + string;
			}
			return new URL(string);
		} catch(MalformedURLException e) {
			// not an URL
			return null;
		}
		
	}
	
	public String getTokenReplacement() {
		if(!replaced) {
			// Testing if it is an URL preceded by (
			String prefix = ""; 
			if(tokenReplacement.startsWith("(")) {
				tokenReplacement = token.substring(1);
				prefix = "(";
			}
			
			Map<String,String> anchorAttibutes = new HashMap<>(1);
			anchorAttibutes.put("target", "_blank");
			String url = tokenReplacement;
			String postfix = tokenReplacement.substring(tokenReplacement.length()-1);
			if(postfix.matches(FINAL_CHARACTERS_TO_REMOVE_FROM_LINK)) {
				url = tokenReplacement.substring(0, token.length()-1);
			}else {
				postfix = "";
			}
			tokenReplacement = prefix + ReplaceableToken.createLink(url, url, anchorAttibutes) + postfix;
			replaced = true;
		}
		return tokenReplacement;
	}
	
}