/*
    * Copyright 2019 the original author or authors.
    *
    * 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.bremersee.dccon.service;
  
  import java.util.regex.Pattern;
  import org.bremersee.dccon.model.DnsNode;
  
  /**
   * The dns node comparator.
   *
   * @author Christian Bremer
   */
  public class DnsNodeComparator extends AbstractDnsComparator<DnsNode> {
  
    /**
     * Instantiates a dns node comparator.
     */
    DnsNodeComparator() {
      this(Boolean.TRUE);
    }
  
    /**
     * Instantiates a dns node comparator.
     *
     * @param asc use ascending sort order or not
     */
    private DnsNodeComparator(Boolean asc) {
      super(asc);
    }
  
    @Override
    public int compare(DnsNode o1, DnsNode o2) {
      final String s1 = o1 != null && o1.getName() != null ? o1.getName() : "";
      final String s2 = o2 != null && o2.getName() != null ? o2.getName() : "";
  
      final String[] sa1 = s1.split(Pattern.quote("."));
      final String[] sa2 = s2.split(Pattern.quote("."));
      if (sa1.length == sa2.length) {
        for (int i = 0; i < sa1.length; i++) {
          int result = format(sa1[i], 3).compareToIgnoreCase(format(sa2[i], 3));
          if (result != 0) {
            return isAsc() ? result : -1 * result;
          }
        }
        return 0;
      }
  
      int result = format(s1, 3).compareToIgnoreCase(format(s2, 3));
      return isAsc() ? result : -1 * result;
    }
  }