upnpdevicedescriptionhandler.java

国外的j2me播放器软件

package no.auc.one.portableplayer.communication;

import java.util.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;

public abstract class UPnPDeviceDescriptionHandler extends DefaultHandler {
    	protected UPnPDevice dev;
    	protected Vector services;
        private Stack tagStack;
        private String locationURL = null;
       
    	public UPnPDeviceDescriptionHandler() {
        }
		
    	public UPnPDeviceDescriptionHandler(String url) {
            locationURL = url;
        }
        
        /* (non-Javadoc)
         * @see org.xml.sax.helpers.DefaultHandler#startDocument()
         */
        public void startDocument() throws SAXException {
            dev = new UPnPDevice();
            services = new Vector();
            tagStack = new Stack();
        }

        public void startElement(
            String uri, 
            String localName, 
            String qName, 
            Attributes attributes) throws SAXException 
        {
        	if(qName.equals("service")) {
                // Should know if the device description contains an URLBase 
                // element or not at this point
                if(dev.urlBase == null || dev.urlBase == "") {
                    // Use locationURL as URLBase
                    dev.urlBase = getHostAndPort(locationURL);
                }
                services.addElement(new UPnPService());
            }
        	tagStack.push(qName);
        }
        
        public void characters(char[] ch, int start, int length) throws SAXException {
            String chars = new String(ch, start, length).trim();
			
            if(chars.length() > 0) {
                String qName = (String)tagStack.peek();
                            
                if (qName.equals("friendlyName")) {
                    dev.friendlyName = chars;
                } else if (qName.equals("URLBase")) {
                	dev.urlBase = chars;
				} else if (qName.equals("UDN")) {
                	dev.deviceUDN = chars;
                } else if (qName.equals("serviceType")) {
                	UPnPService currentService = (UPnPService)services.lastElement();
                	currentService.setServiceType(chars);
                } else if (qName.equals("serviceId")) {
                	UPnPService currentService = (UPnPService)services.lastElement();
                	currentService.setServiceId(chars);
                } else if (qName.equals("controlURL")) {
                	UPnPService currentService = (UPnPService)services.lastElement();
                	currentService.setControlURL(dev.urlBase + chars);
                } else if (qName.equals("SCPDURL")) {
                	UPnPService currentService = (UPnPService)services.lastElement();
                	currentService.setSCPDURL(dev.urlBase + chars);
                } else if (qName.equals("eventSubURL")) {
                	UPnPService currentService = (UPnPService)services.lastElement();
                	currentService.setEventSubURL(dev.urlBase + chars);
                }
            }
        }
        
        public void endElement(String uri, String localName, String qName) throws SAXException {
        	tagStack.pop();    	
        }

        public void endDocument() throws SAXException {
            if (dev != null) {
                dev.setDeviceDescriptionLocation(locationURL);
            }
        }
		
		public UPnPDevice getDevice() {
			return dev;
		}
		
		public String getLocationUrl() {
			return locationURL;
		}
		
		public void setLocationUrl(String url) {
			locationURL = url;
		}

    	/**
    	 * Analyze the serverLocationUrls to get only the address and port
    	 * @param url URL to find host and port of.
    	 * @return Returns host and port of an URL
    	 */
    	private String getHostAndPort(String url) {
			System.out.println("getHostAndPort(" + url + ")");
			
    		int ss = 0;
    		for (int i = 8; i < url.length(); i++) {			
    		    ss=url.substring(8).indexOf('/');
    		}
            
    		return url.substring(0, ss + 9);
    	}
}