content: /*
   * Copyright (c) 2013 - 2014, Allen A. George <allen dot george at gmail dot com>
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in the
   *       documentation and/or other materials provided with the distribution.
   *     * Neither the name of libraft nor the
   *       names of its contributors may be used to endorse or promote products
   *       derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package io.libraft.agent.configuration;
  
  import io.libraft.algorithm.RaftConstants;
  
  import javax.annotation.Nullable;
  import javax.validation.ConstraintValidator;
  import javax.validation.ConstraintValidatorContext;
  
  /**
   * Implementation of {@link ConstraintValidator} that validates
   * values annotated by {@link MinEntriesToSnapshot}.
   */
  public final class MinEntriesToSnapshotValidator implements ConstraintValidator<MinEntriesToSnapshot, Integer> {
  
      private int ceil;
  
      @Override
      public void initialize(MinEntriesToSnapshot constraintAnnotation) {
          this.ceil = constraintAnnotation.ceil();
      }
  
      @Override
      public boolean isValid(@Nullable Integer value, ConstraintValidatorContext context) {
          // if nulls aren't allowed, annotate the parameter with a @NotNull annotation
          // see http://docs.jboss.org/hibernate/validator/5.1/reference/en-US/html/validator-customconstraints.html (S.6.1.2)
          if (value == null) {
              return true;
          }
  
          // ensure that it's (either disabled or > 0) and (<= 'ceil')
          boolean isValid = ((value.compareTo(RaftConstants.SNAPSHOTS_DISABLED) == 0) || (value.compareTo(0) == 1)) &&
                            ((value.compareTo(ceil) == -1) || (value.compareTo(ceil) == 0));
  
          // return a custom error message
          // FIXME (AG): I'm still not clear exactly how this message is interpolated
          if (!isValid) {
              context.disableDefaultConstraintViolation();
              context.buildConstraintViolationWithTemplate("value should be " + RaftConstants.SNAPSHOTS_DISABLED + " or > 0 and <= " + ceil).addConstraintViolation();
          }
  
          return isValid;
      }
  }
  