Java String Camel Case camelCase(String text)

Description

Converts the given String to camel case.

License

LGPL

Declaration

public static String camelCase(String text) 

Method Source Code

//package com.java2s;
// Metawidget (licensed under LGPL)

public class Main {
    /**//w w w .j av  a  2s .co m
     * Converts the given String to camel case.
     * <p>
     * The first letter is lowercased, as per Java convention.
     */

    public static String camelCase(String text) {

        return camelCase(text, ' ');
    }

    /**
     * Converts the given String to camel case.
     * <p>
     * The first letter is lowercased, as per Java convention.
     */

    public static String camelCase(String text, char separator) {

        StringBuilder builder = new StringBuilder(text.length());

        // Convert separators to camel case

        int firstCharacter = -1;
        boolean lastWasSeparator = false;
        char[] chars = text.toCharArray();

        for (int loop = 0, length = chars.length; loop < length; loop++) {

            char c = chars[loop];

            if (c == separator) {
                lastWasSeparator = true;
                continue;
            }

            if (!Character.isLetter(c) && !Character.isDigit(c)) {
                continue;
            }

            if (firstCharacter == -1) {
                // Do the first character below
                firstCharacter = loop;
                continue;
            }

            if (lastWasSeparator) {
                builder.append(Character.toUpperCase(c));
                lastWasSeparator = false;
                continue;
            }

            builder.append(c);
        }

        // Do the first character. Special support in case the first *two* characters are
        // capitalized

        // TODO: DOB should be dob?

        if (firstCharacter != -1) {
            int nextCharacter = firstCharacter + 1;
            if (chars.length > nextCharacter
                    && (Character.isLetter(chars[nextCharacter]) || Character.isDigit(chars[nextCharacter]))
                    && Character.isUpperCase(chars[nextCharacter])) {
                builder.insert(0, chars[firstCharacter]);
            } else {
                builder.insert(0, Character.toLowerCase(chars[firstCharacter]));
            }
        }

        return builder.toString();
    }
}

Related

1. camelCase(String s)
2. camelCase(String str)
3. CamelCase(String str)
4. camelCase(String string, boolean firstUpper)
5. camelCase(String text)
6. camelCase(String text)
7. camelCase(String text)
8. camelCased(String str)
9. camelCasedWord(String s)