javax.xml.bind.annotation.adapters.NormalizedStringAdapter.java Source code

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package javax.xml.bind.annotation.adapters;

/**
 * {@link XmlAdapter} to handle {@code xs:normalizedString}.
 *
 * <p>
 * Replaces any tab, CR, and LF by a whitespace character ' ',
 * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
 *
 * @author Kohsuke Kawaguchi, Martin Grebac
 * @since 1.6, JAXB 2.0
 */
public final class NormalizedStringAdapter extends XmlAdapter<String, String> {
    /**
     * Replace any tab, CR, and LF by a whitespace character ' ',
     * as specified in <a href="http://www.w3.org/TR/xmlschema-2/#rf-whiteSpace">the whitespace facet 'replace'</a>
     */
    public String unmarshal(String text) {
        if (text == null)
            return null; // be defensive

        int i = text.length() - 1;

        // look for the first whitespace char.
        while (i >= 0 && !isWhiteSpaceExceptSpace(text.charAt(i)))
            i--;

        if (i < 0)
            // no such whitespace. replace(text)==text.
            return text;

        // we now know that we need to modify the text.
        // allocate a char array to do it.
        char[] buf = text.toCharArray();

        buf[i--] = ' ';
        for (; i >= 0; i--)
            if (isWhiteSpaceExceptSpace(buf[i]))
                buf[i] = ' ';

        return new String(buf);
    }

    /**
     * No-op.
     *
     * Just return the same string given as the parameter.
     */
    public String marshal(String s) {
        return s;
    }

    /**
     * Returns true if the specified char is a white space character
     * but not 0x20.
     */
    protected static boolean isWhiteSpaceExceptSpace(char ch) {
        // most of the characters are non-control characters.
        // so check that first to quickly return false for most of the cases.
        if (ch >= 0x20)
            return false;

        // other than we have to do four comparisons.
        return ch == 0x9 || ch == 0xA || ch == 0xD;
    }
}