package ch.qos.logback.core.joran.event.stax;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.joran.spi.ElementPath;
import ch.qos.logback.core.joran.spi.JoranException;
import ch.qos.logback.core.spi.ContextAwareBase;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
public class StaxEventRecorder extends ContextAwareBase {
List<StaxEvent> eventList = new ArrayList<StaxEvent>();
ElementPath globalElementPath = new ElementPath();
public StaxEventRecorder(Context context) {
setContext(context);
}
public void recordEvents(InputStream inputStream) throws JoranException {
try {
XMLEventReader xmlEventReader = XMLInputFactory.newInstance().createXMLEventReader(inputStream);
read(xmlEventReader);
} catch (XMLStreamException e) {
throw new JoranException("Problem parsing XML document. See previously reported errors.", e);
}
}
public List<StaxEvent> getEventList() {
return eventList;
}
private void read(XMLEventReader xmlEventReader) throws XMLStreamException {
while (xmlEventReader.hasNext()) {
XMLEvent xmlEvent = xmlEventReader.nextEvent();
switch (xmlEvent.getEventType()) {
case XMLEvent.START_ELEMENT:
addStartElement(xmlEvent);
break;
case XMLEvent.CHARACTERS:
addCharacters(xmlEvent);
break;
case XMLEvent.END_ELEMENT:
addEndEvent(xmlEvent);
break;
default:
break;
}
}
}
private void addStartElement(XMLEvent xmlEvent) {
StartElement se = xmlEvent.asStartElement();
String tagName = se.getName().getLocalPart();
globalElementPath.push(tagName);
ElementPath current = globalElementPath.duplicate();
StartEvent startEvent = new StartEvent(current, tagName, se.getAttributes(), se.getLocation());
eventList.add(startEvent);
}
private void addCharacters(XMLEvent xmlEvent) {
Characters characters = xmlEvent.asCharacters();
StaxEvent lastEvent = getLastEvent();
if (lastEvent instanceof BodyEvent) {
BodyEvent be = (BodyEvent) lastEvent;
be.append(characters.getData());
} else {
// ignore space only text if the previous event is not a BodyEvent
if(!characters.isWhiteSpace()) {
BodyEvent bodyEvent = new BodyEvent(characters.getData(), xmlEvent.getLocation());
eventList.add(bodyEvent);
}
}
}
private void addEndEvent(XMLEvent xmlEvent) {
EndElement ee = xmlEvent.asEndElement();
String tagName = ee.getName().getLocalPart();
EndEvent endEvent = new EndEvent(tagName, ee.getLocation());
eventList.add(endEvent);
globalElementPath.pop();
}
StaxEvent getLastEvent() {
if (eventList.isEmpty()) {
return null;
}
int size = eventList.size();
if(size == 0)
return null;
return eventList.get(size - 1);
}
}