On Tue, Jan 13, 2009 at 3:03 AM, <xor at freenetproject.org> wrote:
> Author: xor
> Date: 2009-01-12 19:03:18 +0000 (Mon, 12 Jan 2009)
> New Revision: 25028
>
> Added:
> trunk/freenet/src/freenet/support/XMLTree.java
> Log:
> Move XML tree generator to a separate class in freenet.support
Why not just use DOM if you want a tree?
> Added: trunk/freenet/src/freenet/support/XMLTree.java
> ===================================================================
> --- trunk/freenet/src/freenet/support/XMLTree.java
> (rev 0)
> +++ trunk/freenet/src/freenet/support/XMLTree.java 2009-01-12 19:03:18
> UTC (rev 25028)
> @@ -0,0 +1,105 @@
> +package freenet.support;
> +import java.io.IOException;
> +import java.io.InputStream;
> +import java.util.EmptyStackException;
> +import java.util.Set;
> +import java.util.Stack;
> +
> +import javax.xml.parsers.ParserConfigurationException;
> +import javax.xml.parsers.SAXParserFactory;
> +
> +import org.xml.sax.Attributes;
> +import org.xml.sax.SAXException;
> +import org.xml.sax.ext.DefaultHandler2;
> +
> +
> +/**
> + * A class which parses an input stream as XML and builds a tree structure
> of the XML.
> + * Use getRoot() to access the tree.
> + *
> + * FIXME: Also use this class in the WoT plugin XML parsers.
> + */
> +public class XMLTree extends DefaultHandler2 {
> + private final Set<String> mAllowedElementNames;
> +
> + public XMLTree(Set<String> allowedElementNames, InputStream
> inputStream) throws SAXException, IOException, ParserConfigurationException {
> + mAllowedElementNames = allowedElementNames;
> +
> SAXParserFactory.newInstance().newSAXParser().parse(inputStream, this);
> + }
> +
> + public XMLElement getRoot() {
> + return rootElement;
> + }
> +
> + public class XMLElement {
> + public final String name;
> + public final Attributes attrs;
> + public String cdata = null;
> + public MultiValueTable<String, XMLElement> children = new
> MultiValueTable<String, XMLElement>();
> +
> + public XMLElement(String newName, Attributes newAttributes)
> throws Exception {
> + name = newName;
> + attrs = newAttributes;
> +
> + if(!mAllowedElementNames.contains(name))
> + throw new Exception("Unknown element in
> Message: " + name);
> + }
> + }
> +
> + private XMLElement rootElement = null;
> +
> + private final Stack<XMLElement> elements = new Stack<XMLElement>();
> +
> + @Override
> + public void startElement(String nameSpaceURI, String localName,
> String qName, Attributes attrs) throws SAXException {
> + String name = (qName == null ? localName : qName);
> +
> + try {
> + XMLElement element = new XMLElement(name, attrs);
> +
> + if(rootElement == null)
> + rootElement = element;
> +
> + try {
> + elements.peek().children.put(name, element);
> + }
> + catch(EmptyStackException e) { }
> + elements.push(element);
> +
> + /* FIXME: A speedup would be to only store CDATA for
> elements selected by the creator of the XMLTreeGenerator. */
> + /* Alternatively the <Date> and <Time> elements could
> be changed to also contain a CDATA tag, then the following
> + * line could be removed because all CDATA in the
> message XML is also labeled as CDATA. We should ask SomeDude
> + * whether FMS can be modified to also do that, we
> want to stay compatible to FMS message XML. */
> + cdata = new StringBuffer(10 * 1024);
> + } catch (Exception e) {
> + Logger.error(this, "Parsing error", e);
> + }
> + }
> +
> + StringBuffer cdata;
> +
> + public void beginCDATA() {
> + cdata = new StringBuffer(10 * 1024);
> + }
> +
> + public void characters(char[] ch, int start, int length) {
> + if(cdata != null)
> + cdata.append(ch, start, length);
> + }
> +
> + public void endCDATA() {
> + elements.peek().cdata = cdata.toString();
> + cdata = null;
> + }
> +
> + @Override
> + public void endElement(String uri, String localName, String qName) {
> + try {
> + XMLElement newElement = elements.pop(); /* This can
> fail because we do not push elements with invalid name */
> + if(cdata != null)
> + newElement.cdata = cdata.toString();
> + }
> + catch(EmptyStackException e) {}
> + cdata = null;
> + }
> +}
> \ No newline at end of file
>
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