package foundation.dictionary;

import java.util.Iterator;

import foundation.data.entity.IDictionary;
import foundation.data.entity.IDictionaryBucket;
import foundation.json.IJSONProvider;
import foundation.json.IJSONWriter;
import foundation.util.MapList;

public class DictionaryBucket extends IDictionaryBucket implements Iterable<IDictionary>, IJSONProvider {

	private static DictionaryBucket instance;
	private MapList<String, IDictionary> items;
	private Dictionary cached;
	
	private DictionaryBucket() {
		items = new MapList<String, IDictionary>();
	}
	
	public static DictionaryBucket getInstance() {
		return instance;
	}
	
	public static DictionaryBucket newInstance() {
		return new DictionaryBucket();
	}
	
	public void activate() {
		instance = this;
		IDictionaryBucket.registerActive(this);
	}

	@Override
	public IDictionary getDictionary(String id) {
		IDictionary dictionary = items.get(id);
		return dictionary;
	}

	public Dictionary getCachedOne(String id) {
		if (id == null) {
			return null;
		}
		
		if (cached != null && id.equals(cached.getId())) {
			return cached;
		}
		
		cached = (Dictionary)getDictionary(id);
		return cached;
	}

	public void loadOne(IDictionary dictionary) {
		items.add(dictionary.getId(), dictionary);
	}

	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.beginArray();
		
		for (IDictionary dictionary: items) {
			writer.beginObject();
			dictionary.writeJSONBody(writer);
			writer.endObject();
		}
		
		writer.endArray();
	}

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