vinothchandar commented on a change in pull request #1159: [HUDI-479] Eliminate 
or Minimize use of Guava if possible
URL: https://github.com/apache/incubator-hudi/pull/1159#discussion_r398333316
 
 

 ##########
 File path: 
hudi-common/src/main/java/org/apache/hudi/common/util/CollectionUtils.java
 ##########
 @@ -0,0 +1,132 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hudi.common.util;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class CollectionUtils {
+  /**
+   * Determines whether two iterators contain equal elements in the same 
order. More specifically,
+   * this method returns {@code true} if {@code iterator1} and {@code 
iterator2} contain the same
+   * number of elements and every element of {@code iterator1} is equal to the 
corresponding element
+   * of {@code iterator2}.
+   *
+   * <p>Note that this will modify the supplied iterators, since they will 
have been advanced some
+   * number of elements forward.
+   */
+  public static boolean elementsEqual(Iterator<?> iterator1, Iterator<?> 
iterator2) {
+    while (iterator1.hasNext()) {
+      if (!iterator2.hasNext()) {
+        return false;
+      }
+      Object o1 = iterator1.next();
+      Object o2 = iterator2.next();
+      if (!Objects.equals(o1, o2)) {
+        return false;
+      }
+    }
+    return !iterator2.hasNext();
+  }
+
+  @SafeVarargs
+  public static <T> Set<T> createSetFromElements(final T... elements) {
+    return Stream.of(elements).collect(Collectors.toSet());
+  }
+
+  public static <K,V> Map<K, V> createImmutableMap(final K key, final V value) 
{
+    return Collections.unmodifiableMap(Collections.singletonMap(key, value));
+  }
+
+  @SafeVarargs
+  public static <T> List<T> createImmutableList(final T... elements) {
+    return 
Collections.unmodifiableList(Stream.of(elements).collect(Collectors.toList()));
+  }
+
+  public static <K,V> Map<K,V> createImmutableMap(final Map<K,V> map) {
+    return Collections.unmodifiableMap(map);
+  }
+
+  @SafeVarargs
+  public static <T> Set<T> createImmutableSet(final T... elements) {
+    return 
Collections.unmodifiableSet(Stream.of(elements).collect(Collectors.toSet()));
+  }
+
+  public static <T> Set<T> createImmutableSet(final Set<T> set) {
+    return Collections.unmodifiableSet(set);
+  }
+
+  public static <T> List<T> createImmutableList(final List<T> list) {
+    return Collections.unmodifiableList(list);
+  }
+
+  private static Object[] checkElementsNotNull(Object... array) {
+    return checkElementsNotNull(array, array.length);
+  }
+
+  private static Object[] checkElementsNotNull(Object[] array, int length) {
+    for (int i = 0; i < length; i++) {
+      checkElementNotNull(array[i], i);
+    }
+    return array;
+  }
+
+  private static Object checkElementNotNull(Object element, int index) {
+    if (element == null) {
+      throw new NullPointerException("at index " + index);
+    }
+    return element;
+  }
+
+  public static class Maps {
 
 Review comment:
   we can file a follow up JIRA and deal with it later it as well

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