Strings.java

package play.modules.scaffold.utils;

import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang.StringUtils;

public class Strings {
    public static final String capitalize(String s) {
        return String.valueOf(s.charAt(0)).toUpperCase() + s.substring(1);
    }

    public static final String removeBlankLines(String s) {
        if (StringUtils.isEmpty(s))
            return s;
        StringBuilder sb = new StringBuilder();
        String[] lines = StringUtils.split(s, '\n');
        for (String line : lines) {
            if (!StringUtils.isBlank(line))
                sb.append(line + '\n');
        }
        return sb.toString();
    }

    public static final String wordify(String s) {
        StringBuilder sb = new StringBuilder();
        boolean isFirstCharacter = true;
        boolean inUpperCase = false;
        for (char c : s.toCharArray()) {
            if (Character.isLetter(c)) {
                if (isFirstCharacter) {
                    sb.append(Character.toUpperCase(c));
                    isFirstCharacter = false;
                } else if (inUpperCase) {
                    if (Character.isUpperCase(c)) {
                        sb.append(Character.toUpperCase(c));
                    } else {
                        inUpperCase = false;
                        sb.append(c);
                    }
                } else {
                    if (Character.isUpperCase(c)) {
                        inUpperCase = true;
                        sb.append(' ');
                    }
                    sb.append(c);
                }
            } else {
                sb.append(c);
            }
        }
        return sb.toString();
    }

    public static final String pluralize(String name) {
        if (name == null || name.isEmpty())
            return name;
        String normalized = name.toLowerCase();
        // plural form is the same
        if (name.equalsIgnoreCase("news"))
            return name;
        if (name.equalsIgnoreCase("axis"))
            return "Axes";
        if (name.equalsIgnoreCase("person"))
            return "People";
        if (name.endsWith("ty"))
            return name.substring(0, name.length() - 1) + "ies";
        if (inList(normalized, "man", "woman"))
            return Strings.capitalize(name.substring(0, name.length() - 3) + "men");
        if (name.equalsIgnoreCase("child"))
            return "Children";
        // add 'es'
        if (name.endsWith("ch") || name.endsWith("sh") || name.endsWith("x") || name.endsWith("ss")) {
            return name + "es";
        }
        // default behavior is to add 's'
        return name + "s";
    }

    private static final boolean inList(String name, String... matches) {
        List<String> theList = Arrays.asList(matches);
        if (theList.contains(name)) {
            return true;
        }
        return false;
    }

    public static String join(String in[], char joinBy) {
        StringBuilder sb = new StringBuilder();
        for (int idx = 0; idx < in.length; idx++) {
            sb.append(in[idx]);
            if (idx + 1 < in.length)
                sb.append(joinBy);
        }
        return sb.toString();
    }
}