package com.yahoo.xml;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import java.math.BigInteger;import java.math.BigDecimal;import java.util.*;// TODO: Document.// TODO: Figure out what to do about XML that doesn't conform to the schema.public class XmlParser extends DefaultHandler {    private Stack stack;    private Map root = null;    private Stack typeStack;    public static final Object get(Map map, String path) {        StringTokenizer tok = new StringTokenizer(path.substring(1), "/");        Object obj = map;        while((obj != null) && tok.hasMoreTokens()) {            if (obj != null) {                obj = ((Map)obj).get(tok.nextToken());            }        }        return obj;    }    public static String getString(Map map, String path) {        return (String) get(map, path);    }    public static List getList(Map map, String path) {        Object item = get(map, path);        if((item != null) && !(item instanceof List)) {            List container = new ArrayList();            container.add(item);            item = container;        }        return (List) item;    }    public static BigInteger getBigInteger(Map map, String path) {        String asString = getString(map, path);        return (asString != null) ? new BigInteger(asString, 10) : null;    }    public static BigDecimal getBigDecimal(Map map, String path) {        String asString = getString(map, path);        if(asString.equalsIgnoreCase("NaN")) {            asString = null;        }        return (asString != null) ? new BigDecimal(asString) : null;    }    public static Boolean getBoolean(Map map, String path) {        String asString = getString(map, path);        return (asString != null) ? Boolean.valueOf(asString) : null;    }    public void startDocument() throws SAXException {        stack = new Stack();        stack.push(new HashMap());        typeStack = new Stack();    }    public void endDocument() throws SAXException {        if (stack.size() != 1) {            throw new SAXException("Parse error, stack size greater than 1");        }        root = (Map) stack.pop();    }    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {        String parentPath;        if(typeStack.size() > 0) {            parentPath = (String) typeStack.peek();        }        else {            parentPath = "";        }        typeStack.push(parentPath + "/" + qName);        Map newMap = new HashMap();        for (int i = 0; i < attributes.getLength(); i++) {            newMap.put(attributes.getQName(i), attributes.getValue(i));        }        Map top = (Map) stack.peek();        Object obj = top.get(qName);        if (obj == null) {            top.put(qName, newMap);        }        else if (obj instanceof Map) {            List newList = new LinkedList();            newList.add(obj);            newList.add(newMap);            top.put(qName, newList);        }        else if (obj instanceof List) {            ((List) obj).add(newMap);        }        stack.push(newMap);    }    public void endElement(String uri, String localName, String qName) throws SAXException {        stack.pop();        typeStack.pop();    }    public void characters(char ch[], int start, int length) throws SAXException {        String current = (String) ((Map) stack.peek()).get("value");        if(current != null) {            current += new String(ch, start, length);        }        else {            current = new String(ch, start, length);        }        ((Map) stack.peek()).put("value", current);    }    public Map getRoot() {        return root;    }}