Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * TMQL4J - Javabased TMQL Engine
 * 
 * Copyright: Copyright 2010 Topic Maps Lab, University of Leipzig. http://www.topicmapslab.de/    
 * License:   Apache License, Version 2.0 http://www.apache.org/licenses/LICENSE-2.0.html
 * 
 * @author Sven Krosse
 * @email krosse@informatik.uni-leipzig.de
 *
 */

import java.util.Collections;
import java.util.Comparator;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Main {
    /**
     * Returns the ordered keys of the given map
     * 
     * @param map
     *            the map
     * @return the ordered keys
     */
    public final static List<String> getOrderedKeys(final Map<String, Object> map) {
        List<String> keys = new LinkedList<String>();
        if (!map.isEmpty()) {
            keys.addAll(map.keySet());
            Collections.sort(keys, new Comparator<String>() {
                /**
                 * {@inheritDoc}
                 */
                public int compare(String o1, String o2) {
                    if (o1 == o2) {
                        return 0;
                    }
                    int n1 = -1;
                    int n2 = -1;
                    try {
                        n1 = Integer.parseInt(o1.substring(1));
                    } catch (NumberFormatException e) {
                        // IGNORE
                    }
                    try {
                        n2 = Integer.parseInt(o2.substring(1));
                    } catch (NumberFormatException e) {
                        // IGNORE
                    }
                    /*
                     * n1 is a number
                     */
                    if (n1 != -1) {
                        /*
                         * n2 is a number
                         */
                        if (n2 != -1) {
                            return n1 - n2;
                        }
                        /*
                         * n2 is a string literal
                         */
                        return -1;
                    }
                    /*
                     * n1 is a literal and n2 is a number
                     */
                    if (n2 != -1) {
                        return -1;
                    }
                    /*
                     * both are literals
                     */
                    return o1.compareTo(o2);
                }
            });
        }
        return keys;
    }
}