package org.bitbucket.jdk7fun;

import java.util.*;
import com.google.common.collect.*;

class Arrays2 {

	public static <T, U extends Comparable<? super U>> void sortBy(T[] array, Extractor<T, U> extractor) {
		sortBy(extractor).sort(array);		
	}		

	public static <T, U extends Comparable<? super U>> SortBuilder<T> sortBy(Extractor<T, U> extractor) {
		return new SortBuilder<T>().and(extractor);
	}

	public static class SortBuilder<T>{
		private Ordering<T> ordering =  #{left, right -> 0};
		
		public  <U extends Comparable<? super U>> SortBuilder<T> and(Extractor<T, U> extractor){
 			ordering = ordering.compound(#{T left, T right -> extractor.get(left).compareTo(extractor.get(right))});
			return this;
		}

		public void sort(T[] array){ Arrays.sort(array, ordering); }
	}
}