/*
 * Copyright (c) 2017 Cinchapi Inc.
 *
 * Licensed 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 com.cinchapi.common.collect;

import java.util.Collection;
import java.util.Set;

import com.google.common.collect.Sets;

/**
 * Utils for Collections.
 * 
 * @author Jeff Nelson
 */
public final class Collections {

    /**
     * Add the {@code item} to the {@code collection} if it is not {@code null}.
     * 
     * @param collection the collection into which a non-null item is added
     * @param item a possibly non-null item
     */
    public static <T> void addIfNotNull(Collection<T> collection, T item) {
        if(item != null) {
            collection.add(item);
        }
    }

    /**
     * Ensure that the specified {@code collection} is a {@link Set} or
     * transform it into one if it is not.
     * 
     * @param collection the collection to ensure
     * @return a {@link Set} with all the distinct elements in the
     *         {@code collection}
     */
    public static <T> Set<T> ensureSet(Collection<T> collection) {
        if(collection instanceof Set) {
            return (Set<T>) collection;
        }
        else {
            return Sets.newLinkedHashSet(collection);
        }

    }

    private Collections() {/* no-init */}

}

@@ -676,24 +676,59 @@
 .util.Set;%0A%0A
+import javax.annotation.Nullable;%0A%0A
 import com.g
@@ -754,16 +754,16 @@
 t.Sets;%0A
-
 %0A/**%0A * 
@@ -850,16 +850,509 @@
 ions %7B%0A%0A
+    /**%0A     * Add the %7B@code items%7D to the %7B@code collection%7D if it is not%0A     * %7B@code null%7D.%0A     * %0A     * @param collection a collection into which a non-null collection of%0A     *            %7B@code items%7D is added%0A     * @param items a possibly non-null %7B@link Collection%7D of items%0A     */%0A    public static %3CT%3E void addAllIfNotNull(Collection%3CT%3E collection,%0A            @Nullable Collection%3CT%3E items) %7B%0A        if(items != null) %7B%0A            collection.addAll(items);%0A        %7D%0A    %7D%0A%0A
     /**%0A
@@ -1560,32 +1560,32 @@
 ll item%0A     */%0A
-
     public stati
@@ -1633,16 +1633,38 @@
 lection,
+%0A            @Nullable
  T item)

add addAllIfNotNull method to Collections class