/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.modules.tasklist.core.translators;

import java.io.CharConversionException;
import java.io.Writer;
import org.openide.xml.XMLUtil;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

/**
 * A method or a static function.
 *
 * @author Tim Lebedkov
 */
public class XMLSerializer implements ContentHandler {
    private IndentedWriter w;
    private boolean firstElement = true;
    private boolean lastElement = false;
    private String publicID;
    private String systemID;
    
    /**
     * Constructor
     *
     * @param w output stream
     */
    public XMLSerializer(Writer w) {
        this.w = new IndentedWriter(w);
    }
    
    /**
     * Sets new public ID
     *
     * @param id new id or null if not DTD
     */
    public void setPublicID(String id) {
        this.publicID = id;
    }
    
    /**
     * Sets new system ID
     *
     * @param id new id or null if not DTD
     */
    public void setSystemID(String id) {
        this.systemID = id;
    }
    
    public void characters(char[] ch, int start, int length) throws SAXException {
        try {
            w.print(XMLUtil.toElementContent(new String(ch, start, length)));
        } catch (CharConversionException e) {
            throw new SAXException(e.getMessage());
        }
        lastElement = false;
    }
    
    public void endDocument() throws SAXException {
        // todo ????
    }
    
    public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
        if(lastElement)
            w.println();
        
        w.unindent();
        
        // todo ???
        w.print("");
        lastElement = true;
    }
    
    public void endPrefixMapping(String prefix) throws SAXException {
        // todo not implemented
    }
    
    public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
        // todo not implemented
    }
    
    public void processingInstruction(String target, String data) throws SAXException {
        // todo not implemented
    }
    
    public void setDocumentLocator(Locator locator) {
        // todo ???
    }
    
    public void skippedEntity(String name) throws SAXException {
        // todo ???
    }
    
    public void startDocument() throws SAXException {
        // todo ?
        w.println("");
        w.println();
    }
    
    public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
        if(firstElement) {
            if(publicID != null && systemID != null) {
                w.println("");
                w.println();
            }
            
            firstElement = false;
        }
        
        if(lastElement)
            w.println();
        
        // todo escape names?
        w.print("<" + qName);
        for(int i = 0; i < atts.getLength(); i++) {
            w.print(" ");
            w.print(atts.getQName(i) + "=\"");
            w.print(atts.getValue(i) + "\"");
        }
        w.print(">");
        w.indent();
        lastElement = true;
    }
    
    public void startPrefixMapping(String prefix, String uri) throws SAXException {
        // todo not implemented
    }
}