[Yanel-dev] DOM Helper classes.

[Alec Bickerton]

Are there any similar helper classes in the yanel core that include the
functionality shown below.

In short :
- Create a new DOM object
- Create a text element
- Convert a DOM into a String.

Not xml related but useful.
- Stream data

If not, then I would like to include these in a new package under
org.wyona.util...

WDYT?


Code below..

    private void streamData( InputStream is, OutputStream os, int
packetSize  ) throws IOException {
        final byte[ ] packet = new byte[ packetSize ];
        int c = 0;
        while( ( c = is.read( packet )) != -1  ){
            os.write( packet );
        }
    }

    public static final String toString( Document document, boolean
isFragment, boolean indent, String charset ) {
        if( document == null )
            return null;
        StringWriter strWtr = new StringWriter();
        StreamResult strResult = new StreamResult(strWtr);
        TransformerFactory tfac = TransformerFactory.newInstance();
        try {
            Transformer t = tfac.newTransformer();
            if( isFragment )
                t.setOutputProperty( OutputKeys.OMIT_XML_DECLARATION, YES );

            if( charset == null)
                t.setOutputProperty(OutputKeys.ENCODING, DEFAULT_ENCODING);
            else
                t.setOutputProperty(OutputKeys.ENCODING, charset );
            t.setOutputProperty(OutputKeys.INDENT, (indent) ? YES : NO);
            t.setOutputProperty(OutputKeys.METHOD, "xml"); //xml, html, text

t.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
            t.transform( new DOMSource(document.getDocumentElement()),
strResult);
        } catch (Exception e) {
          // todo handle this more specifically
        }
        return strResult.getWriter().toString();
    }

    public static final Document  createDOM( String rootName ) throws
ParserConfigurationException {
        DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = dbfac.newDocumentBuilder();
        Document doc = docBuilder.newDocument();
        Element root = doc.createElement( rootName );
        doc.appendChild(root);
        return doc;
    }

    public static final Element createTextElement( Document doc, String
name, String value, HashMap<String, String> attribs ){
        Element child = doc.createElement( name );
        if( attribs !=null ){
            Iterator<Entry<String,String>> iter =
attribs.entrySet().iterator();
            while( iter.hasNext() ){
                Entry<String, String> attr = iter.next();
                child.setAttribute( attr.getKey(), attr.getValue() );
            }
        }
        Text text = doc.createTextNode( value );
        child.appendChild(text);
        return child;
    }