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Mybatis 通用 Mapper 和 Spring 集成
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/**
 * Copyright 2010-2016 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 

 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * 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.
 */

package tk.mybatis.spring.annotation;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.BeanNameGenerator;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
import tk.mybatis.spring.mapper.ClassPathMapperScanner;
import tk.mybatis.spring.mapper.MapperFactoryBean;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;

public class MapperScannerRegistrar implements ImportBeanDefinitionRegistrar, ResourceLoaderAware, EnvironmentAware {
    public static final Logger LOGGER = LoggerFactory.getLogger(MapperScannerRegistrar.class);

    private ResourceLoader resourceLoader;

    private Environment environment;

    @Override
    public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {

        AnnotationAttributes annoAttrs = AnnotationAttributes.fromMap(importingClassMetadata.getAnnotationAttributes(MapperScan.class.getName()));
        ClassPathMapperScanner scanner = new ClassPathMapperScanner(registry);
        // this check is needed in Spring 3.1
        if (resourceLoader != null) {
            scanner.setResourceLoader(resourceLoader);
        }

        Class annotationClass = annoAttrs.getClass("annotationClass");
        if (!Annotation.class.equals(annotationClass)) {
            scanner.setAnnotationClass(annotationClass);
        }

        Class markerInterface = annoAttrs.getClass("markerInterface");
        if (!Class.class.equals(markerInterface)) {
            scanner.setMarkerInterface(markerInterface);
        }

        Class generatorClass = annoAttrs.getClass("nameGenerator");
        if (!BeanNameGenerator.class.equals(generatorClass)) {
            scanner.setBeanNameGenerator(BeanUtils.instantiateClass(generatorClass));
        }

        Class mapperFactoryBeanClass = annoAttrs.getClass("factoryBean");
        if (!MapperFactoryBean.class.equals(mapperFactoryBeanClass)) {
            scanner.setMapperFactoryBean(BeanUtils.instantiateClass(mapperFactoryBeanClass));
        }

        scanner.setSqlSessionTemplateBeanName(annoAttrs.getString("sqlSessionTemplateRef"));
        scanner.setSqlSessionFactoryBeanName(annoAttrs.getString("sqlSessionFactoryRef"));

        List basePackages = new ArrayList();
        for (String pkg : annoAttrs.getStringArray("value")) {
            if (StringUtils.hasText(pkg)) {
                basePackages.add(pkg);
            }
        }
        for (String pkg : annoAttrs.getStringArray("basePackages")) {
            if (StringUtils.hasText(pkg)) {
                basePackages.add(pkg);
            }
        }
        for (Class clazz : annoAttrs.getClassArray("basePackageClasses")) {
            basePackages.add(ClassUtils.getPackageName(clazz));
        }
        //优先级 mapperHelperRef > properties > springboot
        String mapperHelperRef = annoAttrs.getString("mapperHelperRef");
        String[] properties = annoAttrs.getStringArray("properties");
        if (StringUtils.hasText(mapperHelperRef)) {
            scanner.setMapperHelperBeanName(mapperHelperRef);
        } else if (properties != null && properties.length > 0) {
            scanner.setMapperProperties(properties);
        } else {
            try {
                scanner.setMapperProperties(this.environment);
            } catch (Exception e) {
                LOGGER.warn("只有 Spring Boot 环境中可以通过 Environment(配置文件,环境变量,运行参数等方式) 配置通用 Mapper，" +
                    "其他环境请通过 @MapperScan 注解中的 mapperHelperRef 或 properties 参数进行配置!" +
                    "如果你使用 tk.mybatis.mapper.session.Configuration 配置的通用 Mapper，你可以忽略该错误!", e);
            }
        }
        scanner.registerFilters();
        scanner.doScan(StringUtils.toStringArray(basePackages));
    }

    @Override
    public void setEnvironment(Environment environment) {
        this.environment = environment;
    }

    @Override
    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourceLoader = resourceLoader;
    }
}