From c1a78e8724a5b4296bb794a5e6d5a15129b008e7 Mon Sep 17 00:00:00 2001
From: Massimiliano Assante <massimiliano.assante@isti.cnr.it>
Date: Wed, 18 Sep 2019 12:46:46 +0200
Subject: [PATCH] added method Set<String> getMentionedUsernames

---
 .../socialutillibrary/Utils.java               | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/main/java/org/gcube/social_networking/socialutillibrary/Utils.java b/src/main/java/org/gcube/social_networking/socialutillibrary/Utils.java
index de99591..80ad189 100644
--- a/src/main/java/org/gcube/social_networking/socialutillibrary/Utils.java
+++ b/src/main/java/org/gcube/social_networking/socialutillibrary/Utils.java
@@ -3,7 +3,9 @@ package org.gcube.social_networking.socialutillibrary;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -41,6 +43,8 @@ public class Utils {
 	 */
 
 	private static final String HASHTAG_REGEX = "^#\\w+([-_.]?\\w+)*|\\s#\\w+([-_.]?\\w+)*|(?<=[\\[({])#\\w+([-_.]?\\w+)";
+	
+	private static final String MENTIONS_REGEX = "^@\\w+([-_.]?\\w+)*|\\s@\\w+([-_.]?\\w+)*|(?<=[\\[({])@\\w+([-_.]?\\w+)";
 
 	/**
 	 * IPv4 regex
@@ -80,6 +84,20 @@ public class Utils {
 		sb.append("<span style=\"color:gray; font-size:12px;\">shared </span><a class=\"link\" href=\"").append(url).append("\" target=\"_blank\">").append("a file.").append("</a> ").toString();
 		return sb.toString();
 	}
+	/**
+	 * 
+	 * @param postText
+	 * @return a set containing the list of mentions found
+	 */
+	public static Set<String> getMentionedUsernames(String postText) {
+		Set<String> mentions = new HashSet<>();		
+		Pattern MY_PATTERN = Pattern.compile(MENTIONS_REGEX);
+		Matcher matcher = MY_PATTERN.matcher(postText);
+		while (matcher.find()) {
+			mentions.add(matcher.group());
+		}
+		return mentions;		
+	}
 
 	/**
 	 *