revert CollectionUtils

Author: M-blockcoder

common/src/main/java/org/tron/common/utils/CollectionUtils.java

@@ -11,6 +11,22 @@
 
 public class CollectionUtils {
 
+  public static <K, V> List<V> collectList(Collection<K> items, Function<K, V> collector) {
+    List<V> collected = new ArrayList<>(items.size());
+    for (K item : items) {
+      collected.add(collector.apply(item));
+    }
+    return collected;
+  }
+
+  public static <K, V> Set<V> collectSet(Collection<K> items, Function<K, V> collector) {
+    Set<V> collected = new HashSet<>();
+    for (K item : items) {
+      collected.add(collector.apply(item));
+    }
+    return collected;
+  }
+
   public static <T> List<T> truncate(List<T> items, int limit) {
     if (limit > items.size()) {
       return new ArrayList<>(items);
@@ -49,4 +65,24 @@ public static <T> List<T> truncateRandom(List<T> items, int limit, int confirm)
     }
     return truncated;
   }
+
+  public static <T> List<T> selectList(Collection<T> items, Predicate<T> predicate) {
+    List<T> selected = new ArrayList<>();
+    for (T item : items) {
+      if (predicate.test(item)) {
+        selected.add(item);
+      }
+    }
+    return selected;
+  }
+
+  public static <T> Set<T> selectSet(Collection<T> items, Predicate<T> predicate) {
+    Set<T> selected = new HashSet<>();
+    for (T item : items) {
+      if (predicate.test(item)) {
+        selected.add(item);
+      }
+    }
+    return selected;
+  }
 }