Strings.java

package org.arquillian.cube.impl.util;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

public final class Strings {

    private Strings() {
        throw new UnsupportedOperationException("Utility Class");
    }

    public static boolean isNullOrEmpty(String s) {
        return s == null || s.isEmpty();
    }

    public static boolean isNotNullOrEmpty(String s) {
        return !isNullOrEmpty(s);
    }

    /**
     * joins a collection of objects together as a String using a separator
     */
    public static String join(final Collection<?> collection, final String separator) {
        StringBuffer buffer = new StringBuffer();
        boolean first = true;
        Iterator<?> iter = collection.iterator();
        while (iter.hasNext()) {
            Object next = iter.next();
            if (first) {
                first = false;
            } else {
                buffer.append(separator);
            }
            buffer.append(next);
        }
        return buffer.toString();
    }

    /**
     * splits a string into a list of strings, ignoring the empty string
     */
    public static List<String> splitAsList(String text, String delimiter) {
        List<String> answer = new ArrayList<String>();
        if (text != null && text.length() > 0) {
            answer.addAll(Arrays.asList(text.split(delimiter)));
        }
        return answer;
    }

    /**
     * splits a string into a list of strings.  Trims the results and ignores empty strings
     */
    public static List<String> splitAndTrimAsList(String text, String sep) {
        ArrayList<String> answer = new ArrayList<String>();
        if (text != null && text.length() > 0) {
            for (String v : text.split(sep)) {
                String trim = v.trim();
                if (trim.length() > 0) {
                    answer.add(trim);
                }
            }
        }
        return answer;
    }
}