org.bukkit.help.HelpTopicComparator Maven / Gradle / Ivy

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package org.bukkit.help;

import java.util.Comparator;

/**
 * Used to impose a custom total ordering on help topics.
 * 
 * All topics are listed in alphabetic order, but topics that start with a
 * slash come after topics that don't.
 */
public class HelpTopicComparator implements Comparator {

  // Singleton implementations
  private static final TopicNameComparator tnc = new TopicNameComparator();
  private static final HelpTopicComparator htc = new HelpTopicComparator();

  private HelpTopicComparator() {
  }

  public static TopicNameComparator topicNameComparatorInstance() {
    return tnc;
  }

  public static HelpTopicComparator helpTopicComparatorInstance() {
    return htc;
  }

  public int compare(HelpTopic lhs, HelpTopic rhs) {
    return tnc.compare(lhs.getName(), rhs.getName());
  }

  public static class TopicNameComparator implements Comparator {
    private TopicNameComparator() {
    }

    public int compare(String lhs, String rhs) {
      boolean lhsStartSlash = lhs.startsWith("/");
      boolean rhsStartSlash = rhs.startsWith("/");

      if (lhsStartSlash && !rhsStartSlash) {
        return 1;
      } else if (!lhsStartSlash && rhsStartSlash) {
        return -1;
      } else {
        return lhs.compareToIgnoreCase(rhs);
      }
    }
  }
}