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.FlexGlobalConfig;
021import com.mybatisflex.core.exception.FlexExceptions;
022import com.mybatisflex.core.table.IdInfo;
023import com.mybatisflex.core.table.TableInfo;
024import com.mybatisflex.core.util.ConvertUtil;
025import org.apache.ibatis.executor.Executor;
026import org.apache.ibatis.executor.keygen.KeyGenerator;
027import org.apache.ibatis.mapping.MappedStatement;
028import org.apache.ibatis.reflection.invoker.Invoker;
029import org.apache.ibatis.session.Configuration;
030
031import java.sql.Statement;
032import java.util.Map;
033
034/**
035 * 通过 java 编码的方式生成主键
036 * 当主键类型配置为 KeyType#Generator 时，使用此生成器生成
037 * {@link KeyType#Generator}
038 */
039public class CustomKeyGenerator implements KeyGenerator {
040
041    protected Configuration configuration;
042    protected IKeyGenerator keyGenerator;
043    protected TableInfo tableInfo;
044    protected IdInfo idInfo;
045
046
047    public CustomKeyGenerator(Configuration configuration, TableInfo tableInfo, IdInfo idInfo) {
048        this.configuration = configuration;
049        FlexGlobalConfig.KeyConfig globalKeyConfig = FlexGlobalConfig.getConfig(configuration).getKeyConfig();
050        String keyValue = MybatisKeyGeneratorUtil.getKeyValue(idInfo, globalKeyConfig);
051        this.keyGenerator = KeyGeneratorFactory.getKeyGenerator(keyValue);
052        this.tableInfo = tableInfo;
053        this.idInfo = idInfo;
054
055        ensuresKeyGeneratorNotNull();
056    }
057
058    private void ensuresKeyGeneratorNotNull() {
059        if (keyGenerator == null) {
060            throw FlexExceptions.wrap("The name of \"%s\" key generator not exist.\n" +
061                            "please check annotation @Id(value=\"%s\") at field: %s#%s"
062                    , idInfo.getValue(), idInfo.getValue(), tableInfo.getEntityClass().getName(), idInfo.getProperty());
063        }
064    }
065
066
067    @Override
068    public void processBefore(Executor executor, MappedStatement ms, Statement stmt, Object parameter) {
069        Object entity = ((Map) parameter).get(FlexConsts.ENTITY);
070        Object generateId = keyGenerator.generate(entity, idInfo.getColumn());
071        try {
072            Invoker setInvoker = tableInfo.getReflector().getSetInvoker(idInfo.getProperty());
073            Object id = ConvertUtil.convert(generateId, setInvoker.getType());
074            setInvoker.invoke(entity, new Object[]{id});
075        } catch (Exception e) {
076            throw FlexExceptions.wrap(e);
077        }
078    }
079
080
081    @Override
082    public void processAfter(Executor executor, MappedStatement ms, Statement stmt, Object parameter) {
083        //do nothing
084    }
085}