treeparser.java

手机程序在线投票的例子

package org.kxml.kdom;


import java.util.*;
import org.kxml.*;
import org.kxml.parser.*;


/** a pull parser that re-parses a kdom tree. */

public class TreeParser extends AbstractXmlParser {

    class Position {

	Node node;
	StartTag start;
	int index = -1;
	Position previous;

	Position (Node node) {
	    this.node = node;
	    index = 0;
	}


	Position (Element element, Position prev) {
	    this.node = element;
	    	    
	    previous = prev;
	    start = new StartTag (prev == null ? null : prev.start, 
				  element.getNamespace (), 
				  element.getName (),
				  element.getAttributes (),
				  element.getChildCount () == 0);

	    start.setPrefixMap (element.getPrefixMap ());
	}
    }


    Position current;


    public TreeParser (Node node) {
	current = new Position (node);
    }
    

    public TreeParser (Element element, boolean skipRoot) {

	current = new Position (element, null);
	if (skipRoot) {
	    current.index = 0;
	    current.start = null;
	}
    }

    

    public ParseEvent readImpl () {

	int i = current.index++;
	Node node = current.node;

	if (i < 0) 
	    return current.start;

	if (i >= node.getChildCount ()) {
		
	    if (current.start == null || i > node.getChildCount ()) 
		return new EndDocument ();

	    ParseEvent result = new EndTag (current.start);
	    if (current.previous != null)
		current = current.previous;

	    return result;
	} 

	int type = node.getType (i);

	switch (type) {
	case Xml.TEXT:
	case Xml.WHITESPACE:
	    return new TextEvent (type, node.getText (i));
 
	case Xml.ELEMENT:
	    current = new Position (node.getElement (i), current);
	    return readImpl ();

	default:
	    return new LegacyEvent 
		(type, (String) node.getChild (i));
	}
    }
}