/*
 * Copyright (c) 2013-2024 Hutool Team and hutool.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.dromara.hutool.db.handler.row;

import org.dromara.hutool.core.array.ArrayUtil;
import org.dromara.hutool.db.handler.ResultSetUtil;

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

/**
 * 将{@link ResultSet}结果中的某行处理为数组
 *
 * @param <E> 数组元素类型
 * @author looly
 */
public class ArrayRowHandler<E> extends AbsRowHandler<E[]> {

	private final Class<E> componentType;

	/**
	 * 构造
	 *
	 * @param meta          {@link ResultSetMetaData}
	 * @param componentType 数组元素类型
	 * @throws SQLException SQL异常
	 */
	public ArrayRowHandler(final ResultSetMetaData meta, final Class<E> componentType) throws SQLException {
		super(meta);
		this.componentType = componentType;
	}

	@SuppressWarnings("unchecked")
	@Override
	public E[] handle(final ResultSet rs) throws SQLException {
		final E[] result = ArrayUtil.newArray(componentType, columnCount);
		for (int i = 0, j = 1; i < columnCount; i++, j++) {
			result[i] = (E) ResultSetUtil.getColumnValue(rs, j, meta.getColumnType(j), componentType);
		}
		return result;
	}
}
