package frame.persist.loader;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;

import frame.object.meta.EntityMeta;
import frame.persist.ILoadable;


public abstract class DataLoader implements ILoadable {

	protected String tableName;
	protected EntityMeta entityMeta;
	
	
	protected DataLoader() {
		
	}
	
	public DataLoader(String tableName) {
		this.tableName = tableName;
	}

	public void load(ResultSet rslt, Object... args) throws Exception {
		ResultSetMetaData metaData = rslt.getMetaData();
		loadTableMeta(metaData);
		
		loadData(rslt);
	}

	private void loadTableMeta(ResultSetMetaData metaData) throws SQLException {
		if (entityMeta == null) {
			ResultMetaFieldReader fieldReader = new ResultMetaFieldReader(metaData);
			entityMeta = new EntityMeta(tableName, fieldReader);
		}
	}

	protected abstract void loadData(ResultSet rslt) throws Exception;

	public void setTableMeta(EntityMeta entityMeta) {
		this.entityMeta = entityMeta;
	}
}