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Regular expression matchers, searcher, lexers based on deterministic finite automata

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package com.almondtools.util.collections;

import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class CollectionUtils {

	public static char[] toCharArray(Collection charlist) {
		char[] chars = new char[charlist.size()];
		int i = 0;
		for (Character c : charlist) {
			chars[i] = c.charValue();
			i++;
		}
		return chars;
	}

	public static List toIntegerList(int[] array) {
		List list = new ArrayList(array.length);
		for (int i : array) {
			list.add(i);
		}
		return list;
	}

	public static  List map(List list, ListMapping mapping) {
		List result = new LinkedList();
		for (F item : list) {
			T mapped = mapping.map(item);
			if (mapped != null) {
				result.add(mapped);
			}
		}
		return result;
	}

	public static  Map map(Map map, MapMapping mapping) {
		Map result = new LinkedHashMap();
		for (Map.Entry item : map.entrySet()) {
			TK mappedkey = mapping.key(item.getKey(), item.getValue());
			TV mappedvalue = mapping.value(item.getKey(), item.getValue());
			if (mappedkey != null && mappedvalue != null) {
				result.put(mappedkey, mappedvalue);
			}
		}
		return result;
	}
}