sanitize config value

gistfile1.java

package snippet;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Snippet {
	public static void main(String[] args) {
		String[] examples = new String[] { "configGlossary:poweredByIcon -> CONFIG_GLOSSARY_POWERED_BY_ICON", "124$32SomeSampleString_thatI_have -> SOME_SAMPLE_STRING_THAT_I_HAVE", "myJSP -> MY_JSP" };

		for (String s : examples) {
			String[] split = s.split(" -> ");
			String input = split[0];
			String expected = split[1];

			String transformed = transform(input);
			if (!transformed.equals(expected)) {
				System.out.println("not working for: " + input + ", got " + transformed);
			} else {
				System.out.println("    working for: " + input + ", got " + transformed);
			}
		}

	}

	private static String transform(String input) {
		input = replaceUnwantedCharacters(input);
		input = splitWordsByDashes(input);
		input = handleMultipleUpcaseCharacters(input);
		return input;

	}

	private static String handleMultipleUpcaseCharacters(String input) {
		Matcher m = Pattern.compile("([A-Z]{2,})").matcher(input);
		StringBuffer multipleUpcases = new StringBuffer();
		while (m.find()) {
			String multipleUpcaseCharacters = m.group(1).toLowerCase();
			m.appendReplacement(multipleUpcases, "_" + multipleUpcaseCharacters.substring(0, 1).toUpperCase() + multipleUpcaseCharacters.toLowerCase().substring(1));
		}
		m.appendTail(multipleUpcases);
		return multipleUpcases.toString().toUpperCase();
	}

	private static String splitWordsByDashes(String input) {
		StringBuffer withMoreDashes = new StringBuffer();
		Matcher camel = Pattern.compile("([A-Z][a-z_]+)").matcher(input);
		while (camel.find()) {
			camel.appendReplacement(withMoreDashes, "_" + camel.group(1));
		}
		camel.appendTail(withMoreDashes);

		// remove dash at the beginning if there is one, this might have
		// happended if the input starts with an uppercase letter
		input = withMoreDashes.toString().replaceFirst("^_", "");
		return input;
	}

	private static String replaceUnwantedCharacters(String input) {
		input = input.replaceAll("\\d", "");
		input = input.replaceAll("\\$", "");
		input = input.replaceAll("\\W", "_");
		return input;
	}
}