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.bookkeeper.common.conf.validators;
  
  import lombok.Data;
  import org.apache.bookkeeper.common.conf.Validator;
  
  /**
   * Validator that validates a configuration value is in a numeric range.
   */
  @Data
  public class RangeValidator implements Validator {
  
      /**
       * A numeric range that checks the lower bound.
       *
       * @param min the minimum acceptable value
       * @return a numeric range that checks the lower bound
       */
      public static RangeValidator atLeast(Number min) {
          return new RangeValidator(min, null);
      }
  
      /**
       * A numeric range that checks the upper bound.
       *
       * @param max the maximum acceptable value
       * @return a numeric range that checks the upper bound
       */
      public static RangeValidator atMost(Number max) {
          return new RangeValidator(null, max);
      }
  
      /**
       * A numeric range that checks both lower and upper bounds.
       *
       * @param min the minimum acceptable value
       * @param max the maximum acceptable value
       * @return a numeric range that checks both lower and upper bounds
       */
      public static RangeValidator between(Number min, Number max) {
          return new RangeValidator(min, max);
      }
  
      private final Number min;
      private final Number max;
  
      @Override
      public boolean validate(String name, Object value) {
          if (value instanceof Number) {
              Number n = (Number) value;
              if (min != null && n.doubleValue() < min.doubleValue()) {
                  return false;
              } else {
                  return max == null || n.doubleValue() <= max.doubleValue();
              }
          } else {
              return false;
          }
      }
  
      @Override
      public String toString() {
          if (null == min) {
              return "[... , " + max + "]";
          } else if (null == max) {
              return "[" + min + ", ...]";
          } else {
              return "[" + min + ", " + max + "]";
          }
      }
  
      @Override
      public String documentation() {
          return toString();
      }
  }
  