Java String Quote quoteArgument(String arg)

Description

Quotes specified string using '\"' if needed to.

License

Open Source License

Declaration

public static String quoteArgument(String arg) 

Method Source Code

//package com.java2s;

public class Main {
    /**//from ww w  .  j av  a2 s.c  o  m
     * Quotes specified string using <tt>'\"'</tt> if needed to. Returns
     * quoted string.
     * <p>Note that whitespace characters such as '\n' and '\t' are not
     * escaped as "\n" and "\t". Instead, the whole string is quoted. This is
     * sufficient to allow it to contain any whitespace character.
     * 
     * @see #joinArguments
     */
    public static String quoteArgument(String arg) {
        int length = arg.length();

        boolean needQuotes;
        if (length == 0) {
            needQuotes = true;
        } else {
            switch (arg.charAt(0)) {
            case '\"':
            case '\'':
                needQuotes = true;
                break;
            default: {
                needQuotes = false;
                for (int i = 0; i < length; ++i) {
                    if (Character.isWhitespace(arg.charAt(i))) {
                        needQuotes = true;
                        break;
                    }
                }
            }
            }
        }
        if (!needQuotes)
            return arg;

        StringBuilder quoted = new StringBuilder();
        quoted.append('\"');
        for (int i = 0; i < length; ++i) {
            char c = arg.charAt(i);

            if (c == '\"')
                quoted.append("\\\"");
            else
                quoted.append(c);
        }
        quoted.append('\"');

        return quoted.toString();
    }
}

Related

1. quoteAndEscapeValue(String serviceQName)
2. quoteArg(final String arg)
3. quoteArg(String arg)
4. quoteArgForCommand(String input)
5. quoteArgument(final String argument)
6. quoteAtom(String term)
7. quoteAtom(String term)
8. quoteAttrValue(String s)
9. quoteCanonical(String s)