src/com/ibm/icu/impl/CollectionUtilities.java

/*
 *******************************************************************************
 * Copyright (C) 2008, Google Inc, International Business Machines Corporation and         *
 * others. All Rights Reserved.                                                *
 *******************************************************************************
 */
package com.ibm.icu.impl;

import java.util.Comparator;

/**
 * @author markdavis
 *
 */
public class CollectionUtilities {
    
    public static class MultiComparator implements Comparator {
        private Comparator[] comparators;
    
        public MultiComparator (Comparator[] comparators) {
            this.comparators = comparators;
        }
    
        /* Lexigraphic compare. Returns the first difference
         * @return zero if equal. Otherwise +/- (i+1) 
         * where i is the index of the first comparator finding a difference
         * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
         */
        public int compare(Object arg0, Object arg1) {
            for (int i = 0; i < comparators.length; ++i) {
                int result = comparators[i].compare(arg0, arg1);
                if (result == 0) continue;
                if (result > 0) return i+1;
                return -(i+1);
            }
            return 0;
        }
    }
}