package foundation.capacity.sight;

import java.util.HashSet;
import java.util.Set;

import foundation.dao.preload.Bucket;
import foundation.json.IJSONProvider;
import foundation.json.IJSONWriter;
import foundation.util.Util;

public class SightBucket extends Bucket<SightAgent> implements IJSONProvider {

	private static SightBucket instance;
	private Set<String> freeTables;
	
	private SightBucket() {
		freeTables = new HashSet<String>();
	}
	
	public static SightBucket getInstance() {
		return instance;
	}
	
	public static SightBucket newInstance() {
		return new SightBucket();
	}
	
	public void activate() {
		instance = this;
	}

	public void loadOneFreeTable(String tableName) {
		if (Util.isEmpty(tableName)) {
			return;
		}
		
		tableName = tableName.toLowerCase();
		freeTables.add(tableName);		
	}
	
	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.beginArray("sights");
		
		for (SightAgent sight: items) {
			writer.beginObject();
			sight.writeJSONBody(writer);
			writer.endObject();
		}
		
		writer.endArray();
	}

}