SimpleSequencer.java

package kornell.gui.client.sequence;

import java.util.List;
import java.util.logging.Logger;

import com.google.web.bindery.event.shared.EventBus;

import kornell.api.client.KornellSession;
import kornell.core.lom.Actom;
import kornell.core.util.StringUtils;
import kornell.gui.client.event.ActomEnteredEvent;

public abstract class SimpleSequencer implements Sequencer {
	static final Logger logger = Logger.getLogger(SimpleSequencer.class.getName());
	protected KornellSession session;
	protected EventBus bus;
	private String enrollmentUUID;
	protected Actom currentActom;
	protected List<Actom> actoms;
	protected int currentIndex;


	public SimpleSequencer(EventBus bus, KornellSession session) {
		this.session = session;
		this.bus = bus;
		bus.addHandler(NavigationRequest.TYPE, this);
	}

	protected void dropBreadcrumb() {
		session.setItem(getBreadcrumbKey(), currentKey());
		String key = "";
		if (currentActom != null) {
			key = currentActom.getKey();
			currentActom.setVisited(true);
		}
		if (StringUtils.isNone(key))
			logger.warning("Could not drop breadcrumb for empty key");
		bus.fireEvent(new ActomEnteredEvent(enrollmentUUID, key));
		fireProgressEvent();
	}
	
	protected String getBreadcrumbKey() {
		return "sequencer." + enrollmentUUID+ ".CURRENT_KEY";
	}
	
	protected String currentKey() {
		return currentActom != null ? currentActom.getKey() : "";
	}
	
	protected void setEnrollmentUUID(String enrollmentUUID){
		this.enrollmentUUID = enrollmentUUID;
	}
	
	protected int lookupCurrentIndex(String currentKey) {
		int currentIndex = 0;
		if (currentKey != null && !currentKey.isEmpty()) {
			for (int i = 0; i < actoms.size(); i++) {
				Actom actom = actoms.get(i);
				if (currentKey.equals(actom.getKey())) {
					return i;
				}
			}
		}
		return currentIndex;
	}
}