Added list utilities class

src/main/java/fr/xephi/authme/util/ListUtils.java

@@ -0,0 +1,75 @@
+package fr.xephi.authme.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ListUtils {
+
+    /**
+     * Implode a list of elements into a single string, with a specified separator.
+     *
+     * @param elements The elements to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(List<String> elements, String separator) {
+        // Create a string builder
+        StringBuilder sb = new StringBuilder();
+
+        // Append each element
+        for(String element : elements) {
+            // Make sure the element isn't empty
+            if(element.trim().length() == 0)
+                continue;
+
+            // Prefix the separator if it isn't the first element
+            if(sb.length() > 0)
+                sb.append(separator);
+
+            // Append the element
+            sb.append(element);
+        }
+
+        // Return the result
+        return sb.toString();
+    }
+
+    /**
+     * Implode two lists of elements into a single string, with a specified separator.
+     *
+     * @param elements The first list of elements to implode.
+     * @param otherElements The second list of elements to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(List<String> elements, List<String> otherElements, String separator) {
+        // Combine the lists
+        List<String> combined = new ArrayList<>();
+        combined.addAll(elements);
+        combined.addAll(otherElements);
+
+        // Implode and return the result
+        return implode(combined, separator);
+    }
+
+    /**
+     * Implode two elements into a single string, with a specified separator.
+     *
+     * @param element The first element to implode.
+     * @param otherElement The second element to implode.
+     * @param separator The separator to use.
+     *
+     * @return The result string.
+     */
+    public static String implode(String element, String otherElement, String separator) {
+        // Combine the lists
+        List<String> combined = new ArrayList<>();
+        combined.add(element);
+        combined.add(otherElement);
+
+        // Implode and return the result
+        return implode(combined, separator);
+    }
+}