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package org.bukkit.help;
import java.util.Comparator;
/**
* Used to impose a custom total ordering on help topics.
* <p>
* 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<HelpTopic> {
// Singleton implementations
private static final TopicNameComparator tnc = new TopicNameComparator();
public static TopicNameComparator topicNameComparatorInstance() {
return tnc;
}
private static final HelpTopicComparator htc = new HelpTopicComparator();
public static HelpTopicComparator helpTopicComparatorInstance() {
return htc;
}
private HelpTopicComparator() {}
public int compare(HelpTopic lhs, HelpTopic rhs) {
return tnc.compare(lhs.getName(), rhs.getName());
}
public static class TopicNameComparator implements Comparator<String> {
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);
}
}
}
}
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