code: /*
   * Copyright 2015 Google Inc. All rights reserved.
   *
   * 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 org.physical_web.collection;
  
  /**
   * Utility methods for the Physical Web library.
   */
  class Utils {
    /**
     * Compare two nullable comparables, preferring any non-null value over null.
     * @param o1 first object to compare
     * @param o2 second object to compare
     * @param <T> a type that implements Comparable&lt;T&gt;
     * @return comparison value
     */
    public static <T extends Comparable<T>> int nullSafeCompare(T o1, T o2) {
      if (o1 == o2) {
        return 0;
      }
      if (o1 == null) {
        return -1;
      }
      if (o2 == null) {
        return 1;
      }
      return o1.compareTo(o2);
    }
  }
  