1package de.gultsch.chat.xml;
 2
 3import java.io.IOException;
 4import java.io.InputStream;
 5import java.io.InputStreamReader;
 6
 7import org.xmlpull.v1.XmlPullParser;
 8import org.xmlpull.v1.XmlPullParserException;
 9
10import android.os.PowerManager;
11import android.os.PowerManager.WakeLock;
12import android.util.Log;
13import android.util.Xml;
14
15public class XmlReader {
16	private static final String LOGTAG = "xmppService";
17	private XmlPullParser parser;
18	private PowerManager.WakeLock wakeLock;
19	private InputStream is;
20
21	public XmlReader(WakeLock wakeLock) {
22		this.parser = Xml.newPullParser();
23		try {
24			this.parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES,true);
25		} catch (XmlPullParserException e) {
26			Log.d(LOGTAG,"error setting namespace feature on parser");
27		}
28		this.wakeLock = wakeLock;
29	}
30	
31	public void setInputStream(InputStream inputStream) {
32		this.is = inputStream;
33		try {
34			parser.setInput(new InputStreamReader(this.is));
35		} catch (XmlPullParserException e) {
36			Log.d(LOGTAG,"error setting input stream");
37		}
38	}
39	
40	public void reset() {
41		try {
42			parser.setInput(new InputStreamReader(this.is));
43		} catch (XmlPullParserException e) {
44			Log.d(LOGTAG,"error resetting input stream");
45		}
46	}
47	
48	public Tag readTag() throws XmlPullParserException, IOException {
49		if (wakeLock.isHeld()) {
50			//Log.d(LOGTAG,"there was a wake lock. releasing it till next event");
51			wakeLock.release(); //release wake look while waiting on next parser event
52		}
53		while(parser.next() != XmlPullParser.END_DOCUMENT) {
54				//Log.d(LOGTAG,"found new event. acquiring wake lock");
55				wakeLock.acquire();
56				if (parser.getEventType() == XmlPullParser.START_TAG) {
57					Tag tag = Tag.start(parser.getName());
58					for(int i = 0; i < parser.getAttributeCount(); ++i) {
59						tag.setAttribute(parser.getAttributeName(i), parser.getAttributeValue(i));
60					}
61					return tag;
62				} else if (parser.getEventType() == XmlPullParser.END_TAG) {
63					Tag tag = Tag.end(parser.getName());
64					return tag;
65				} else if (parser.getEventType() == XmlPullParser.TEXT) {
66					Tag tag = Tag.no(parser.getText());
67					return tag;
68				}
69			}
70		if (wakeLock.isHeld()) {
71			wakeLock.release();
72		}
73		return null; //end document;
74	}
75
76	public Element readElement(Tag currentTag) throws XmlPullParserException, IOException {
77		Element element = new Element(currentTag.getName());
78		element.setAttributes(currentTag.getAttributes());
79		Tag nextTag = this.readTag();
80		if(nextTag.isNo()) {
81			element.setContent(nextTag.getName());
82			nextTag = this.readTag();
83		}
84		while(!nextTag.isEnd(element.getName())) {
85			Element child = this.readElement(nextTag);
86			element.addChild(child);
87			nextTag = this.readTag();
88		}
89		return element;
90	}
91}