Reorganized Imports/Packages

src/main/java/org/betterx/bclib/util/CollectionsUtil.java

@@ -0,0 +1,44 @@
+package org.betterx.bclib.util;
+
+import java.util.*;
+
+public class CollectionsUtil {
+    /**
+     * Will return mutable copy of list.
+     *
+     * @param list {@link List} to make mutable.
+     * @return {@link ArrayList} or original {@link List} if it is mutable.
+     */
+    public static <E> List<E> getMutable(List<E> list) {
+        if (list instanceof ArrayList) {
+            return list;
+        }
+        return new ArrayList<>(list);
+    }
+
+    /**
+     * Will return mutable copy of set.
+     *
+     * @param set {@link Set} to make mutable.
+     * @return {@link HashSet} or original {@link Set} if it is mutable.
+     */
+    public static <E> Set<E> getMutable(Set<E> set) {
+        if (set instanceof HashSet) {
+            return set;
+        }
+        return new HashSet<>(set);
+    }
+
+    /**
+     * Will return mutable copy of map.
+     *
+     * @param map {@link Map} to make mutable.
+     * @return {@link HashMap} or original {@link Map} if it is mutable.
+     */
+    public static <K, V> Map<K, V> getMutable(Map<K, V> map) {
+        if (map instanceof HashMap) {
+            return map;
+        }
+        return new HashMap<>(map);
+    }
+}