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/*
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.xml.bind.annotation.adapters;



/**
 * Built-in {@link XmlAdapter} to handle xs:token and its derived types.
 *
 * 
 * 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 {
    /**
     * 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 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;
    }
}