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refactor(data/mybatis-plus): 移动枚举接口到 core 模块，和 MP IEnum 枚举接口解耦
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176
.../main/java/top/continew/starter/data/mybatis/plus/handler/MybatisBaseEnumTypeHandler.java
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| /* | ||
| * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved. | ||
| * <p> | ||
| * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0; | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * <p> | ||
| * http://www.gnu.org/licenses/lgpl.html | ||
| * <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. | ||
| */ | ||
|
|
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| package top.continew.starter.data.mybatis.plus.handler; | ||
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|
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| import com.baomidou.mybatisplus.annotation.EnumValue; | ||
| import com.baomidou.mybatisplus.annotation.IEnum; | ||
| import com.baomidou.mybatisplus.core.toolkit.CollectionUtils; | ||
| import com.baomidou.mybatisplus.core.toolkit.ExceptionUtils; | ||
| import com.baomidou.mybatisplus.core.toolkit.ReflectionKit; | ||
| import com.baomidou.mybatisplus.core.toolkit.StringUtils; | ||
| import org.apache.ibatis.reflection.DefaultReflectorFactory; | ||
| import org.apache.ibatis.reflection.MetaClass; | ||
| import org.apache.ibatis.reflection.ReflectorFactory; | ||
| import org.apache.ibatis.reflection.invoker.Invoker; | ||
| import org.apache.ibatis.type.BaseTypeHandler; | ||
| import org.apache.ibatis.type.JdbcType; | ||
| import top.continew.starter.core.enums.BaseEnum; | ||
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|
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| import java.lang.reflect.Field; | ||
| import java.math.BigDecimal; | ||
| import java.sql.CallableStatement; | ||
| import java.sql.PreparedStatement; | ||
| import java.sql.ResultSet; | ||
| import java.sql.SQLException; | ||
| import java.util.Arrays; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
|
|
||
| /** | ||
| * 自定义枚举属性转换器 | ||
| * | ||
| * @author hubin | ||
| * @author Charles7c | ||
| * @since 2.4.0 | ||
| */ | ||
| public class MybatisBaseEnumTypeHandler<E extends Enum<E>> extends BaseTypeHandler<E> { | ||
|
|
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| private static final Map<String, String> TABLE_METHOD_OF_ENUM_TYPES = new ConcurrentHashMap<>(); | ||
| private static final ReflectorFactory REFLECTOR_FACTORY = new DefaultReflectorFactory(); | ||
| private final Class<E> enumClassType; | ||
| private final Class<?> propertyType; | ||
| private final Invoker getInvoker; | ||
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| public MybatisBaseEnumTypeHandler(Class<E> enumClassType) { | ||
| if (enumClassType == null) { | ||
| throw new IllegalArgumentException("Type argument cannot be null"); | ||
| } | ||
| this.enumClassType = enumClassType; | ||
| MetaClass metaClass = MetaClass.forClass(enumClassType, REFLECTOR_FACTORY); | ||
| String name = "value"; | ||
| if (!BaseEnum.class.isAssignableFrom(enumClassType) && !IEnum.class.isAssignableFrom(enumClassType)) { | ||
| name = findEnumValueFieldName(this.enumClassType).orElseThrow(() -> new IllegalArgumentException(String | ||
| .format("Could not find @EnumValue in Class: %s.", this.enumClassType.getName()))); | ||
| } | ||
| this.propertyType = ReflectionKit.resolvePrimitiveIfNecessary(metaClass.getGetterType(name)); | ||
| this.getInvoker = metaClass.getGetInvoker(name); | ||
| } | ||
|
|
||
| /** | ||
| * 查找标记标记EnumValue字段 | ||
| * | ||
| * @param clazz class | ||
| * @return EnumValue字段 | ||
| */ | ||
| public static Optional<String> findEnumValueFieldName(Class<?> clazz) { | ||
| if (clazz != null && clazz.isEnum()) { | ||
| String className = clazz.getName(); | ||
| return Optional.ofNullable(CollectionUtils.computeIfAbsent(TABLE_METHOD_OF_ENUM_TYPES, className, key -> { | ||
| Optional<Field> fieldOptional = findEnumValueAnnotationField(clazz); | ||
| return fieldOptional.map(Field::getName).orElse(null); | ||
| })); | ||
| } | ||
| return Optional.empty(); | ||
| } | ||
|
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| private static Optional<Field> findEnumValueAnnotationField(Class<?> clazz) { | ||
| return Arrays.stream(clazz.getDeclaredFields()) | ||
| .filter(field -> field.isAnnotationPresent(EnumValue.class)) | ||
| .findFirst(); | ||
| } | ||
|
|
||
| /** | ||
| * 判断是否为MP枚举处理 | ||
| * | ||
| * @param clazz class | ||
| * @return 是否为MP枚举处理 | ||
| */ | ||
| public static boolean isMpEnums(Class<?> clazz) { | ||
| return clazz != null && clazz.isEnum() && (BaseEnum.class.isAssignableFrom(clazz) || IEnum.class | ||
| .isAssignableFrom(clazz) || findEnumValueFieldName(clazz).isPresent()); | ||
| } | ||
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| @SuppressWarnings("Duplicates") | ||
| @Override | ||
| public void setNonNullParameter(PreparedStatement ps, int i, E parameter, JdbcType jdbcType) throws SQLException { | ||
| if (jdbcType == null) { | ||
| ps.setObject(i, this.getValue(parameter)); | ||
| } else { | ||
| // see r3589 | ||
| ps.setObject(i, this.getValue(parameter), jdbcType.TYPE_CODE); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public E getNullableResult(ResultSet rs, String columnName) throws SQLException { | ||
| Object value = rs.getObject(columnName, this.propertyType); | ||
| if (null == value || rs.wasNull()) { | ||
| return null; | ||
| } | ||
| return this.valueOf(value); | ||
| } | ||
|
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||
| @Override | ||
| public E getNullableResult(ResultSet rs, int columnIndex) throws SQLException { | ||
| Object value = rs.getObject(columnIndex, this.propertyType); | ||
| if (null == value || rs.wasNull()) { | ||
| return null; | ||
| } | ||
| return this.valueOf(value); | ||
| } | ||
|
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| @Override | ||
| public E getNullableResult(CallableStatement cs, int columnIndex) throws SQLException { | ||
| Object value = cs.getObject(columnIndex, this.propertyType); | ||
| if (null == value || cs.wasNull()) { | ||
| return null; | ||
| } | ||
| return this.valueOf(value); | ||
| } | ||
|
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| private E valueOf(Object value) { | ||
| E[] es = this.enumClassType.getEnumConstants(); | ||
| return Arrays.stream(es).filter(e -> equalsValue(value, getValue(e))).findAny().orElse(null); | ||
| } | ||
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| /** | ||
| * 值比较 | ||
| * | ||
| * @param sourceValue 数据库字段值 | ||
| * @param targetValue 当前枚举属性值 | ||
| * @return 是否匹配 | ||
| */ | ||
| private boolean equalsValue(Object sourceValue, Object targetValue) { | ||
| String sValue = StringUtils.toStringTrim(sourceValue); | ||
| String tValue = StringUtils.toStringTrim(targetValue); | ||
| if (sourceValue instanceof Number && targetValue instanceof Number && new BigDecimal(sValue) | ||
| .compareTo(new BigDecimal(tValue)) == 0) { | ||
| return true; | ||
| } | ||
| return Objects.equals(sValue, tValue); | ||
| } | ||
|
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||
| private Object getValue(Object object) { | ||
| try { | ||
| return this.getInvoker.invoke(object, new Object[0]); | ||
| } catch (ReflectiveOperationException e) { | ||
| throw ExceptionUtils.mpe(e); | ||
| } | ||
| } | ||
| } |
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