001/*
002 *  Copyright (c) 2022-2024, Mybatis-Flex (fuhai999@gmail.com).
003 *  <p>
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *  <p>
008 *  http://www.apache.org/licenses/LICENSE-2.0
009 *  <p>
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016
017package com.mybatisflex.core.query;
018
019import com.mybatisflex.core.FlexConsts;
020import com.mybatisflex.core.dialect.IDialect;
021
022import java.util.List;
023
024/**
025 * 取相反数（{@code -column}）。
026 *
027 * @author 王帅
028 * @since 2023-11-09
029 */
030public class NegativeQueryColumn extends QueryColumn implements HasParamsColumn {
031
032    private final QueryColumn queryColumn;
033
034    public NegativeQueryColumn(QueryColumn queryColumn) {
035        this.queryColumn = queryColumn;
036    }
037
038    @Override
039    public Object[] getParamValues() {
040        if (queryColumn instanceof HasParamsColumn) {
041            return ((HasParamsColumn) queryColumn).getParamValues();
042        }
043        return FlexConsts.EMPTY_ARRAY;
044    }
045
046    @Override
047    protected String toSelectSql(List<QueryTable> queryTables, IDialect dialect) {
048        return toConditionSql(queryTables, dialect) + WrapperUtil.buildColumnAlias(alias, dialect);
049    }
050
051    @Override
052    protected String toConditionSql(List<QueryTable> queryTables, IDialect dialect) {
053        return "-" + queryColumn.toConditionSql(queryTables, dialect);
054    }
055
056}