/*
 * Copyright (c) 2011-2025, baomidou (jobob@qq.com).
 *
 * 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 com.baomidou.mybatisplus.core.conditions;

import com.baomidou.mybatisplus.core.toolkit.StringPool;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.io.Serializable;

/**
 * 共享查询字段
 *
 * @author miemie
 * @since 2018-11-20
 */
@Data
@Accessors(chain = true)
@NoArgsConstructor
@AllArgsConstructor
public class SharedString implements Serializable {
    private static final long serialVersionUID = -1536422416594422874L;

    /**
     * 共享的 string 值
     */
    private String stringValue;

    /**
     * SharedString 里是 ""
     */
    public static SharedString emptyString() {
        return new SharedString(StringPool.EMPTY);
    }

    /**
     * 置 empty
     *
     * @since 3.3.1
     */
    public void toEmpty() {
        stringValue = StringPool.EMPTY;
    }

    /**
     * 置 null
     *
     * @since 3.3.1
     */
    public void toNull() {
        stringValue = null;
    }
}
