001/**
002 * Copyright (c) 2022-2023, 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 */
016package com.mybatisflex.core.keygen;
017
018import com.mybatisflex.annotation.KeyType;
019import com.mybatisflex.core.FlexConsts;
020import com.mybatisflex.core.exception.FlexExceptions;
021import com.mybatisflex.core.row.Row;
022import com.mybatisflex.core.row.RowKey;
023import org.apache.ibatis.executor.Executor;
024import org.apache.ibatis.executor.keygen.KeyGenerator;
025import org.apache.ibatis.mapping.MappedStatement;
026
027import java.sql.Statement;
028import java.util.Map;
029
030/**
031 * 通过 java 编码的方式生成主键
032 * 当主键类型配置为 KeyType#Generator 时，使用此生成器生成
033 * {@link KeyType#Generator}
034 */
035public class RowCustomKeyGenerator implements KeyGenerator {
036
037    protected RowKey rowKey;
038    protected IKeyGenerator keyGenerator;
039
040
041    public RowCustomKeyGenerator(RowKey rowKey) {
042        this.rowKey = rowKey;
043        this.keyGenerator = KeyGeneratorFactory.getKeyGenerator(rowKey.getValue());
044
045        ensuresKeyGeneratorNotNull();
046    }
047
048    private void ensuresKeyGeneratorNotNull() {
049        if (keyGenerator == null) {
050            throw FlexExceptions.wrap("The name of \"%s\" key generator not exist.", rowKey.getValue());
051        }
052    }
053
054
055    @Override
056    public void processBefore(Executor executor, MappedStatement ms, Statement stmt, Object parameter) {
057        Row row = (Row) ((Map) parameter).get(FlexConsts.ROW);
058        Object generateId = keyGenerator.generate(row, rowKey.getKeyColumn());
059        try {
060            row.put(rowKey.getKeyColumn(), generateId);
061        } catch (Exception e) {
062            throw FlexExceptions.wrap(e);
063        }
064    }
065
066
067    @Override
068    public void processAfter(Executor executor, MappedStatement ms, Statement stmt, Object parameter) {
069        //do nothing
070    }
071}