Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.util;
020
021import java.util.Collection;
022
023/**
024 * Utilities for collection classes.
025 */
026public final class CollectionUtils {
027
028  private CollectionUtils() {
029    // avoid instantiation
030  }
031
032
033  /**
034   * Checks if the collection is null or empty.
035   * @param <T> a type of element of collection
036   * @param parameter the collection
037   * @return true if the collection is null or empty
038   */
039  public static <T> boolean isEmpty(final Collection<T> parameter) {
040    return parameter == null || parameter.isEmpty();
041  }
042
043  /**
044   * Checks if the collection is not null and not empty.
045   * @param <T> a type of element of collection
046   * @param parameter the collection
047   * @return true if the collection is not null nor empty
048   */
049  public static <T> boolean isNotEmpty(final Collection<T> parameter) {
050    return !isEmpty(parameter);
051  }
052
053
054}