| /******************************************************************************* |
| * Copyright (c) 2006 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.intro.universal.util; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /* |
| * Accepts a set of Objects that represents each product's preference over some |
| * matter (e.g. where an item should appear in welcome) and provides a final ruling |
| * on which Object to use. |
| */ |
| public class PreferenceArbiter { |
| |
| private Map<Object, int[]> references; |
| private Object leader; |
| |
| public void consider(Object obj) { |
| if (obj != null) { |
| if (references == null) { |
| references = new HashMap<>(); |
| } |
| int[] count = references.get(obj); |
| if (count == null) { |
| count = new int[] { 0 }; |
| references.put(obj, count); |
| } |
| ++count[0]; |
| if (obj != leader) { |
| if (leader == null) { |
| leader = obj; |
| } |
| else if (count[0] > (references.get(leader))[0]) { |
| leader = obj; |
| } |
| } |
| } |
| } |
| |
| public Object getWinner() { |
| return leader; |
| } |
| } |