/**
 * Copyright (c) 2011-2014, hubin (jobob@qq.com).
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.baomidou.mybatisplus.mapper;

import com.baomidou.mybatisplus.toolkit.ReflectionKit;
import com.baomidou.mybatisplus.toolkit.StringUtils;

/**
 * <p>
 * Entity 对象封装操作类，定义T-SQL语法
 * </p>
 *
 * @author hubin , yanghu , Dyang , Caratacus
 * @Date 2016-11-7
 */
@SuppressWarnings("serial")
public class EntityWrapper<T> extends Wrapper<T> {

	/**
	 * 数据库表映射实体类
	 */
	protected T entity = null;

	public EntityWrapper() {
		/* 注意，传入查询参数 */
	}

	public EntityWrapper(T entity) {
		this.entity = entity;
	}

	public EntityWrapper(T entity, String sqlSelect) {
		this.entity = entity;
		this.sqlSelect = sqlSelect;
	}

	public T getEntity() {
		return entity;
	}

	public void setEntity(T entity) {
		this.entity = entity;
	}

	/**
	 * SQL 片段
	 */
	@Override
	public String getSqlSegment() {
		/*
		 * 无条件
		 */
		String sqlWhere = sql.toString();
		if (StringUtils.isEmpty(sqlWhere)) {
			return null;
		}

		/*
		 * 根据当前实体判断是否需要将WHERE替换成 AND 增加实体不为空但所有属性为空的情况
		 */
		sqlWhere = ReflectionKit.checkFieldValueNotNull(entity) ? sqlWhere.replaceFirst("WHERE", "AND") : sqlWhere;
		return sqlWhere;
	}

}