Small changes to DataSource

core/src/main/java/me/retrodaredevil/solarthing/DataSource.java

@@ -1,26 +1,28 @@
 package me.retrodaredevil.solarthing;
 
 
+import me.retrodaredevil.solarthing.annotations.Nullable;
+
 /**
  * A helper class to create and parse the source string
  */
 public class DataSource {
 	private final String sender;
 	private final long dateMillis;
 	private final String data;
-	
+
 	public DataSource(String sender, long dateMillis, String data) {
 		this.sender = sender;
 		this.dateMillis = dateMillis;
 		this.data = data;
 	}
-	
+
 	/**
 	 * NOTE: dateMillis has a radix of 16 while in string form
 	 * @param string The string representing the sender, dateMillis, and data
 	 * @return The {@link DataSource} represented by {@code string} or null
 	 */
-	public static DataSource createFromStringOrNull(String string){
+	public static @Nullable DataSource createFromStringOrNull(String string){
 		String[] split = string.split("\\|", 3);
 		if(split.length != 3){
 			return null;
@@ -36,12 +38,12 @@ public static DataSource createFromStringOrNull(String string){
 		}
 		return new DataSource(sender, dateMillis, data);
 	}
-	
+
 	@Override
 	public String toString() {
 		return sender + "|" + Long.toHexString(dateMillis) + "|" + data;
 	}
-	
+
 	public String getSender() {
 		return sender;
 	}