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The Plasma SDO Module
There is a newer version: 1.3.3
package org.plasma.provisioning.rdb;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.plasma.metamodel.Class;
import org.plasma.metamodel.Enumeration;
import org.plasma.metamodel.Model;
import org.plasma.metamodel.Property;
import org.plasma.sdo.access.client.JDBCPojoDataAccessClient;

public class ConverterSupport {
	private static Log log = LogFactory.getLog(
			ConverterSupport.class); 
 	protected String[] schemaNames;
    protected String[] namespaces;
    protected Model model;
    /** Maps URI qualified names to classes */
    protected Map classQualifiedNameMap = new HashMap();
    /** Maps URI qualified names to enumerations */
    protected Map enumQualifiedNameMap = new HashMap();
    
    /** 
     * Maps physical schema 
     * qualified primary key constraint names to
     * properties.
     */
    protected Map propertyQualifiedPriKeyConstrainatNameMap = new HashMap();
    /** maps classes to properties */
    protected Map> classPropertyMap = new HashMap>();
    
    protected JDBCPojoDataAccessClient client = new JDBCPojoDataAccessClient();


	/** 
	 * Getting bad unicode characters in DB comments
	 * which cause sax to barf. 
	 * "SAXParseException: An invalid XML character (Unicode: 0x92)" 
	 * No real solution other than
	 * escaping them or filtering them. JAXB does
	 * not support CDATA sections. There are alot
	 * of illegal unicode chars according to many sources, so filtering
	 * seems best.  
	 */    
    protected String filter(String src) {    
    	 
    	//Pattern INVALID_XML_CHARS = Pattern.compile("[^\\u0009\\u000A\\u000D\\u0020-\\uD7FF\\uE000-\\uFFFD\uD800\uDC00-\uDBFF\uDFFF]");
    	//String preCleaned = INVALID_XML_CHARS.matcher(src).replaceAll("");
    	Pattern INVALID_XML_CHARS = Pattern.compile("[\\\\u0]");
    	String preCleaned = INVALID_XML_CHARS.matcher(src).replaceAll("");
    	
    	char[] chars = preCleaned.toCharArray();
    	char[] result = new char[chars.length];
    	int i = 0;
    	for (char ch : chars) {
        	if (org.apache.xml.utils.XMLChar.isValid(ch) && 
        			(Character.isDigit(ch) || Character.isLetter(ch) || 
        			 Character.isWhitespace(ch) || isPunctuation(ch) || isOtherAllowed(ch))) {
    	    	result[i] = ch;
    	    	i++;        		
        	}
        	else 
        		log.debug("stripped/ignored illegal XMl character " + ch);
    	}
    	return new String(result, 0, i);
    }
    
    protected static boolean isPunctuation(char c) {
        return c == ','
            || c == '.'
            || c == '!'
            || c == '?'
            || c == ':'
            || c == ';';
    }
    
    protected static boolean isOtherAllowed(char c) {
        return c == '\''
            || c == '"'
            || c == '@'
            || c == '#'
            || c == '$'
            || c == '%'
            || c == '*'
            || c == '&'
            || c == '('
            || c == ')'
            || c == '-'
            || c == '+';
    }
   
}