forked from plusone/simple-jdbc
105 lines
4.3 KiB
Java
105 lines
4.3 KiB
Java
/*
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* Copyright 2022-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package xyz.zhouxy.jdbc;
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import java.beans.BeanInfo;
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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.beans.PropertyDescriptor;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.sql.ResultSet;
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import java.sql.ResultSetMetaData;
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import java.sql.SQLException;
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import java.util.Arrays;
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import java.util.Map;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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import javax.annotation.Nullable;
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public class DefaultBeanResultMap<T> implements ResultMap<T> {
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private final Constructor<T> constructor;
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private final Map<String, PropertyDescriptor> colPropertyMap;
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private DefaultBeanResultMap(Constructor<T> constructor, Map<String, PropertyDescriptor> colPropertyMap) {
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this.constructor = constructor;
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this.colPropertyMap = colPropertyMap;
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}
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public static <T> DefaultBeanResultMap<T> of(Class<T> beanType) throws SQLException {
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return of(beanType, null);
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}
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public static <T> DefaultBeanResultMap<T> of(Class<T> beanType, @Nullable Map<String, String> propertyColMap)
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throws SQLException {
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try {
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BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
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PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
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Map<String, PropertyDescriptor> colPropertyMap;
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if (propertyColMap != null && !propertyColMap.isEmpty()) {
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colPropertyMap = Arrays.stream(propertyDescriptors)
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.collect(Collectors.toMap(p -> {
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String propertyName = p.getName();
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String colName = propertyColMap.get(propertyName);
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return colName != null ? colName : propertyName;
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}, Function.identity(), (a, b) -> b));
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}
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else {
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colPropertyMap = Arrays.stream(propertyDescriptors)
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.collect(Collectors.toMap(PropertyDescriptor::getName, Function.identity(), (a, b) -> b));
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}
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Constructor<T> constructor = beanType.getDeclaredConstructor();
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constructor.setAccessible(true); // NOSONAR
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return new DefaultBeanResultMap<>(constructor, colPropertyMap);
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}
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catch (IntrospectionException e) {
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throw new SQLException("There is an exception occurs during introspection.", e);
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}
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catch (NoSuchMethodException e) {
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throw new SQLException("Could not find a no-args constructor in " + beanType.getName(), e);
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}
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}
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@Override
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public T map(ResultSet rs, int rowNumber) throws SQLException {
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try {
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T newInstance = this.constructor.newInstance();
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ResultSetMetaData metaData = rs.getMetaData();
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for (int i = 1; i <= metaData.getColumnCount(); i++) {
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String colName = metaData.getColumnName(i);
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PropertyDescriptor propertyDescriptor = this.colPropertyMap.get(colName);
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if (propertyDescriptor != null) {
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Method setter = propertyDescriptor.getWriteMethod();
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if (setter != null) {
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Class<?> propertyType = propertyDescriptor.getPropertyType();
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setter.setAccessible(true); // NOSONAR
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setter.invoke(newInstance, rs.getObject(colName, propertyType));
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}
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}
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}
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return newInstance;
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}
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catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
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throw new SQLException(e);
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}
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}
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}
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