rewrote with a backing arraylist

src/main/java/com/commafeed/backend/FixedSizeSortedSet.java

@@ -1,51 +1,44 @@
 package com.commafeed.backend;
 
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
-import java.util.PriorityQueue;
 
-import com.google.common.collect.Iterables;
-import com.google.common.collect.Lists;
+public class FixedSizeSortedSet<E> {
 
-public class FixedSizeSortedSet<E> extends PriorityQueue<E> {
-
-	private static final long serialVersionUID = 1L;
+	private List<E> inner;
 
 	private final Comparator<? super E> comparator;
 	private final int capacity;
 
 	public FixedSizeSortedSet(int capacity, Comparator<? super E> comparator) {
-		super(Math.max(1, capacity), comparator);
+		this.inner = new ArrayList<E>(Math.max(0, capacity));
 		this.capacity = capacity < 0 ? Integer.MAX_VALUE : capacity;
 		this.comparator = comparator;
 	}
 
-	@Override
-	public boolean add(E e) {
+	public void add(E e) {
+		int position = Math.abs(Collections.binarySearch(inner, e, comparator) + 1);
 		if (isFull()) {
-			E last = last();
-			int comparison = comparator.compare(e, last);
-			if (comparison < 0) {
-				remove(last);
-				return super.add(e);
-			} else {
-				return false;
+			if (position < inner.size()) {
+				inner.remove(inner.size() - 1);
+				inner.add(position, e);
 			}
 		} else {
-			return super.add(e);
+			inner.add(position, e);
 		}
 	}
 
 	public E last() {
-		return Iterables.getLast(this);
+		return inner.get(inner.size() - 1);
 	}
 
 	public boolean isFull() {
-		return size() == capacity;
+		return inner.size() == capacity;
 	}
 
-	@SuppressWarnings("unchecked")
 	public List<E> asList() {
-		return (List<E>) Lists.newArrayList(toArray());
+		return inner;
 	}
 }