content: /*
   * 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.cassandra.harry.gen.rng;
  
  public interface PureRng
  {
      long randomNumber(long i, long stream);
  
      long sequenceNumber(long r, long stream);
  
      default long next(long r)
      {
          return next(r, 0);
      }
  
      long next(long r, long stream);
  
      long prev(long r, long stream);
  
      default long prev(long r)
      {
          return next(r, 0);
      }
  
      class PCGFast implements PureRng
      {
          private final long seed;
  
          public PCGFast(long seed)
          {
              this.seed = seed;
          }
  
          public long randomNumber(long i, long stream)
          {
              return PCGFastPure.shuffle(PCGFastPure.advanceState(seed, i, stream));
          }
  
          public long sequenceNumber(long r, long stream)
          {
              return PCGFastPure.distance(seed, PCGFastPure.unshuffle(r), stream);
          }
  
          public long next(long r, long stream)
          {
              return PCGFastPure.next(r, stream);
          }
  
          public long prev(long r, long stream)
          {
              return PCGFastPure.previous(r, stream);
          }
      }
  }