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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans.impl.common;

import org.apache.xmlbeans.xml.stream.XMLName;
import javax.xml.namespace.QName;
import java.io.UnsupportedEncodingException;

public class XMLNameHelper
{
    public static QName getQName(XMLName xmlName)
    {
        if (xmlName == null)
            return null;
        
        return QNameHelper.forLNS( xmlName.getLocalName(), xmlName.getNamespaceUri() );
    }
    
    public static XMLName forLNS(String localname, String uri)
    {
        if (uri == null)
            uri = "";
        return new XmlNameImpl(uri, localname);
    }

    public static XMLName forLN(String localname)
    {
        return new XmlNameImpl("", localname);
    }

    public static XMLName forPretty(String pretty, int offset)
    {
        int at = pretty.indexOf('@', offset);
        if (at < 0)
            return new XmlNameImpl("", pretty.substring(offset));
        return new XmlNameImpl(pretty.substring(at + 1), pretty.substring(offset, at));
    }

    public static String pretty(XMLName name)
    {
        if (name == null)
            return "null";

        if (name.getNamespaceUri() == null || name.getNamespaceUri().length() == 0)
            return name.getLocalName();
        
        return name.getLocalName() + "@" + name.getNamespaceUri();
    }

    private static final char[] hexdigits = new char[]
        {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

    private static boolean isSafe(int c)
    {
        if (c >= 'a' && c <= 'z')
            return true;
        if (c >= 'A' && c <= 'Z')
            return true;
        if (c >= '0' && c <= '9')
            return true;
        return false;
    }

    public static String hexsafe(String s)
    {
        StringBuffer result = new StringBuffer();
        for (int i = 0; i < s.length(); i++)
        {
            char ch = s.charAt(i);
            if (isSafe(ch))
            {
                result.append(ch);
            }
            else
            {
                byte[] utf8 = null;
                try
                {
                    utf8 = s.substring(i, i + 1).getBytes("UTF-8");
                for (int j = 0; j < utf8.length; j++)
                {
                    result.append('_');
                    result.append(hexdigits[(utf8[j] >> 4) & 0xF]);
                    result.append(hexdigits[utf8[j] & 0xF]);
                    }
                }
                catch(UnsupportedEncodingException uee)
                {
                    // should never happen - UTF-8 is always supported
                    result.append("_BAD_UTF8_CHAR");
                }
            }
        }
        return result.toString();
    }

    public static String hexsafedir(XMLName name)
    {
        if (name.getNamespaceUri() == null || name.getNamespaceUri().length() == 0)
            return "_nons/" + hexsafe(name.getLocalName());
        return hexsafe(name.getNamespaceUri()) + "/" + hexsafe(name.getLocalName());
    }
}