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XMLUtils.javaAPI DocJava SE 5 API6661Fri Aug 26 14:57:24 BST 2005java.util

XMLUtils

public class XMLUtils extends Object
A class used to aid in Properties load and save in XML. Keeping this code outside of Properties helps reduce the number of classes loaded when Properties is loaded.
version
1.9, 01/23/03
author
Michael McCloskey
since
1.3

Fields Summary
private static final String
PROPS_DTD_URI
private static final String
PROPS_DTD
private static final String
EXTERNAL_XML_VERSION
Version number for the format of exported properties files.
Constructors Summary
Methods Summary
static voidemitDocument(org.w3c.dom.Document doc, java.io.OutputStream os, java.lang.String encoding)

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer t = null;
        try {
            t = tf.newTransformer();
            t.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, PROPS_DTD_URI);
            t.setOutputProperty(OutputKeys.INDENT, "yes");
            t.setOutputProperty(OutputKeys.METHOD, "xml");
            t.setOutputProperty(OutputKeys.ENCODING, encoding);
        } catch (TransformerConfigurationException tce) {
            assert(false);
        }
        DOMSource doms = new DOMSource(doc);
        StreamResult sr = new StreamResult(os);
        try {
            t.transform(doms, sr);
        } catch (TransformerException te) {
            IOException ioe = new IOException();
            ioe.initCause(te);
            throw ioe;
        }
static org.w3c.dom.DocumentgetLoadingDoc(java.io.InputStream in)

	DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	dbf.setIgnoringElementContentWhitespace(true);
	dbf.setValidating(true);
        dbf.setCoalescing(true);
        dbf.setIgnoringComments(true);
	try {
	    DocumentBuilder db = dbf.newDocumentBuilder();
	    db.setEntityResolver(new Resolver());
	    db.setErrorHandler(new EH());
            InputSource is = new InputSource(in);
	    return db.parse(is);
	} catch (ParserConfigurationException x) {
	    throw new Error(x);
	}
static voidimportProperties(java.util.Properties props, org.w3c.dom.Element propertiesElement)

        NodeList entries = propertiesElement.getChildNodes();
        int numEntries = entries.getLength();
        int start = numEntries > 0 && 
            entries.item(0).getNodeName().equals("comment") ? 1 : 0;
        for (int i=start; i<numEntries; i++) {
            Element entry = (Element)entries.item(i);
            if (entry.hasAttribute("key")) {
                Node n = entry.getFirstChild();
                String val = (n == null) ? "" : n.getNodeValue();
                props.setProperty(entry.getAttribute("key"), val);
            }
        }
static voidload(java.util.Properties props, java.io.InputStream in)


         
          
    
        Document doc = null;
        try {
            doc = getLoadingDoc(in);
        } catch (SAXException saxe) {
            throw new InvalidPropertiesFormatException(saxe);
        }
        Element propertiesElement = (Element)doc.getChildNodes().item(1);
        String xmlVersion = propertiesElement.getAttribute("version");
        if (xmlVersion.compareTo(EXTERNAL_XML_VERSION) > 0)
            throw new InvalidPropertiesFormatException(
                "Exported Properties file format version " + xmlVersion +
                " is not supported. This java installation can read" +
                " versions " + EXTERNAL_XML_VERSION + " or older. You" +
                " may need to install a newer version of JDK.");
        importProperties(props, propertiesElement);
static voidsave(java.util.Properties props, java.io.OutputStream os, java.lang.String comment, java.lang.String encoding)

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = null;
        try {
            db = dbf.newDocumentBuilder();
        } catch (ParserConfigurationException pce) {
            assert(false);
        }
        Document doc = db.newDocument();
        Element properties =  (Element)
            doc.appendChild(doc.createElement("properties"));

        if (comment != null) {
            Element comments = (Element)properties.appendChild(
                doc.createElement("comment"));
            comments.appendChild(doc.createTextNode(comment));
        }

        Set keys = props.keySet();
        Iterator i = keys.iterator();
        while(i.hasNext()) {
            String key = (String)i.next();
            Element entry = (Element)properties.appendChild(
                doc.createElement("entry"));
            entry.setAttribute("key", key);
            entry.appendChild(doc.createTextNode(props.getProperty(key)));
        }
        emitDocument(doc, os, encoding);