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.distributedlog.common.util;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  /**
   * Utils for bit mask operations.
   */
  public class BitMaskUtils {
  
      /**
       * 1) Unset all bits where value in mask is set.
       * 2) Set these bits to value specified by newValue.
       *
       * <p>e.g.
       * if oldValue = 1010, mask = 0011, newValue = 0001
       * 1) 1010 -> 1000
       * 2) 1000 -> 1001
       *
       * @param oldValue expected old value
       * @param mask the mask of the value for updates
       * @param newValue new value to set
       * @return updated value
       */
      public static long set(long oldValue, long mask, long newValue) {
          checkArgument(oldValue >= 0L && mask >= 0L && newValue >= 0L);
          return ((oldValue & (~mask)) | (newValue & mask));
      }
  
      /**
       * Get the bits where mask is 1.
       *
       * @param value value
       * @param mask mask of the value
       * @return the bit of the mask
       */
      public static long get(long value, long mask) {
          checkArgument(value >= 0L && mask >= 0L);
          return (value & mask);
      }
  }
  