content: /**
   * 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.apache.aurora.common.util;
  
  import com.google.common.base.Preconditions;
  
  /**
   * An interface to define the common functionality that is required for generating random values.
   *
   * @author William Farner
   */
  public interface Random {
  
    /**
     * @see java.util.Random#nextDouble()
     */
    double nextDouble();
  
    /**
     * @see java.util.Random#nextInt(int)
     */
    int nextInt(int n);
  
    /**
     * A Random that wraps a java.util.Random.
     */
    class SystemRandom implements Random {
      private final java.util.Random rand;
  
      public SystemRandom(java.util.Random rand) {
        this.rand = Preconditions.checkNotNull(rand);
      }
  
      @Override
      public double nextDouble() {
        return rand.nextDouble();
      }
  
      @Override
      public int nextInt(int n) {
        return rand.nextInt(n);
      }
    }
  
    // Utility class.
    class Util {
      private Util() {}
  
      /**
       * Creates a new Random based off the default system Random.
       * @return A new default Random.
       */
      public static Random newDefaultRandom() {
        return new SystemRandom(new java.util.Random());
      }
    }
  }
  