android_translation_layer/src/api-impl/android/text/TextUtils.java

package android.text;

import java.util.regex.Pattern;

public class TextUtils {
	// unchanged from android source

	/* split */

	private static String[] EMPTY_STRING_ARRAY = new String[]{};

    public static String[] split(String text, String expression) {
        if (text.length() == 0) {
            return EMPTY_STRING_ARRAY;
        } else {
            return text.split(expression, -1);
        }
    }

    public static String[] split(String text, Pattern pattern) {
        if (text.length() == 0) {
            return EMPTY_STRING_ARRAY;
        } else {
            return pattern.split(text, -1);
        }
    }

	/* join */


    public static String join(CharSequence delimiter, Object[] tokens) {
        StringBuilder sb = new StringBuilder();
        boolean firstTime = true;
        for (Object token: tokens) {
            if (firstTime) {
                firstTime = false;
            } else {
                sb.append(delimiter);
            }
            sb.append(token);
        }
        return sb.toString();
    }

    public static String join(CharSequence delimiter, Iterable tokens) {
        StringBuilder sb = new StringBuilder();
        boolean firstTime = true;
        for (Object token: tokens) {
            if (firstTime) {
                firstTime = false;
            } else {
                sb.append(delimiter);
            }
            sb.append(token);
        }
        return sb.toString();
    }
	// end of unchanged from android source

    public static CharSequence join(Iterable<CharSequence> list) {
        final CharSequence delimiter = ","; // ????
        return join(delimiter, list);
    }

	public static boolean isEmpty(CharSequence str) {
		return str.equals(""); // presumably?
	}
}