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package javax.xml.bind.annotation.adapters;
/**
* Built-in {@link XmlAdapter} to handle <tt>xs:token</tt> and its derived types.
*
* <p>
* This adapter removes leading and trailing whitespaces, then truncate any
* sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
*
* @author Kohsuke Kawaguchi
* @since JAXB 2.0
*/
public class CollapsedStringAdapter extends XmlAdapter<String,String> {
/**
* Removes leading and trailing whitespaces of the string
* given as the parameter, then truncate any
* sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
*/
public String unmarshal(String text) {
if(text==null) return null; // be defensive
int len = text.length();
// most of the texts are already in the collapsed form.
// so look for the first whitespace in the hope that we will
// never see it.
int s=0;
while(s<len) {
if(isWhiteSpace(text.charAt(s)))
break;
s++;
}
if(s==len)
// the input happens to be already collapsed.
return text;
// we now know that the input contains spaces.
// let's sit down and do the collapsing normally.
StringBuffer result = new StringBuffer(len /*allocate enough size to avoid re-allocation*/ );
if(s!=0) {
for( int i=0; i<s; i++ )
result.append(text.charAt(i));
result.append(' ');
}
boolean inStripMode = true;
for (int i = s+1; i < len; i++) {
char ch = text.charAt(i);
boolean b = isWhiteSpace(ch);
if (inStripMode && b)
continue; // skip this character
inStripMode = b;
if (inStripMode)
result.append(' ');
else
result.append(ch);
}
// remove trailing whitespaces
len = result.length();
if (len > 0 && result.charAt(len - 1) == ' ')
result.setLength(len - 1);
// whitespaces are already collapsed,
// so all we have to do is to remove the last one character
// if it's a whitespace.
return result.toString();
}
/**
* 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. */
protected static boolean isWhiteSpace(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 || ch == 0x20;
}
}
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