package foundation.data.getter;

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

import foundation.data.entity.Entity;
import foundation.data.meta.field.FieldRuntimeCreator;
import foundation.data.meta.field.FieldsRuntime;
import foundation.data.meta.field.IFieldReader;
import foundation.data.meta.field.ResultMetaFieldReader;

public class EntityGetter extends DataGetter {

	private Class<?> entityClass;
	private Entity entity;
	private Object object;
 
	public EntityGetter() {
	}
	
	public EntityGetter(FieldsRuntime fieldsMeta) {
		this.fieldsMeta = fieldsMeta;
	}

	public EntityGetter(FieldsRuntime fieldsMeta, Class<?> entityClass) {
		this.fieldsMeta = fieldsMeta;
		this.entityClass = entityClass;
	}

	@Override
	protected void loadData(ResultSet rslt) throws Exception {
		if (rslt.next()) {
			if (entityClass != null) {
				loadToObject();
			}
			else {
				loadToEntity(rslt);
			}
		}		
	}

	private void loadToObject() throws InstantiationException, IllegalAccessException {
		object = entityClass.newInstance();
	}

	private void loadToEntity(ResultSet rslt) throws Exception {
		if (rslt == null) {
			return;
		}
		
		if (fieldsMeta == null) {
			ResultSetMetaData resultMeta = rslt.getMetaData();
			IFieldReader fieldReader = new ResultMetaFieldReader(resultMeta);
			fieldsMeta = FieldRuntimeCreator.create(fieldReader);
		}
		
		entity = new Entity(fieldsMeta);
		int cnt = entity.getFieldCount();
		
		Object obj;
		
		for (int i = 0; i < cnt; i++) {
			obj = rslt.getObject(i + 1);
			entity.set(i, obj);
		}
	}

	public Entity getEntity() {
		return entity;
	}
	
	public Object getObject() {
		return object;
	}
}