NiceOrderBasedOnNumericThreadIdComparator.java

package glug.gui;

import static java.lang.Math.min;
import glug.parser.ThreadId;

import java.util.Comparator;
import java.util.List;

public class NiceOrderBasedOnNumericThreadIdComparator implements Comparator<ThreadId> {

	public static final NiceOrderBasedOnNumericThreadIdComparator INSTANCE = new NiceOrderBasedOnNumericThreadIdComparator();
	
	@Override
	public int compare(ThreadId t1, ThreadId t2) {
		return compareThreadNameParts(t1.getParts(), t2.getParts());
	}
	
	private int compareThreadNameParts(List<Comparable<?>> t1parts, List<Comparable<?>> t2parts) {
		int maxNumParts = min(t1parts.size(), t2parts.size());
		for (int partIndex = 0; partIndex<maxNumParts; ++ partIndex) {
			Comparable<?> t1part = t1parts.get(partIndex), t2part = t2parts.get(partIndex);
			if (t1part instanceof String) {
				if (t2part instanceof Integer) {
					return 1;
				}
				String t1partString = (String) t1part, t2PartString = (String) t2part;
				int partComparision = t1partString.compareTo(t2PartString);
				if (partComparision!=0)
					return partComparision;
			}
			if (t1part instanceof Integer) {
				if (t2part instanceof String) {
					return -1;
				}
				int t1partInt = (Integer) t1part, t2PartInt = (Integer) t2part;
				int partComparision = t1partInt - t2PartInt;
				if (partComparision!=0)
					return partComparision;
			}
		}
		return t1parts.size() - t2parts.size();
	}

}