package foundation.state.approve;

import java.util.Iterator;

import foundation.json.IJSONProvider;
import foundation.json.IJSONWriter;
import foundation.util.MapList;

public class StepList implements Iterable<Step>, IJSONProvider {

	private MapList<String, Step> items;
	
	
	public StepList() {
		items = new MapList<String, Step>();
	}

	public void loadOne(Step step) {
		items.add(step.getId(), step);
	}

	public Step get(String id) {
		return items.get(id);
	}
	
	public Step get(int idx) {
		return items.get(idx);
	}

	public int size() {
		return items.size();
	}
	
	public Step getLast() {
		if (items.isEmpty()) {
			return null;
		}
		
		int idx = items.size() - 1;
		return items.get(idx);
	}

	@Override
	public Iterator<Step> iterator() {
		return items.iterator();
	}

	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.beginArray();
		
		for (Step step: items) {
			step.writeJSON(writer);
		}
		
		writer.endArray();
	}

	public void writeJSONBody(IJSONWriter writer) {
		for (Step step: items) {
			step.writeJSON(writer);
		}
	}

}