/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.xml.bind.annotation.adapters;
/**
* {@link XmlAdapter} to handle <tt>xs:normalizedString</tt>.
*
* <p>
* This adapter removes leading and trailing whitespaces, then replace any tab,
* CR, and LF by a whitespace character ' '.
*
* @author Kohsuke Kawaguchi
* @since JAXB 2.0
*/
public final class NormalizedStringAdapter extends XmlAdapter<String, String> {
/**
* Removes leading and trailing whitespaces of the string given as the
* parameter, then replace any tab, CR, and LF by a whitespace character
* ' '.
*/
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;
}
}
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