package org.mybatis.spring.mapper;import java.io.IOException;import java.lang.annotation.Annotation;import java.util.Arrays;import java.util.Set;import org.apache.commons.logging.Log;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.MutablePropertyValues;import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;import org.springframework.beans.factory.config.BeanDefinition;import org.springframework.beans.factory.config.BeanDefinitionHolder;import org.springframework.beans.factory.config.RuntimeBeanReference;import org.springframework.beans.factory.support.BeanDefinitionRegistry;import org.springframework.beans.factory.support.GenericBeanDefinition;import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;import org.springframework.core.type.AnnotationMetadata;import org.springframework.core.type.ClassMetadata;import org.springframework.core.type.classreading.MetadataReader;import org.springframework.core.type.classreading.MetadataReaderFactory;import org.springframework.core.type.filter.AnnotationTypeFilter;import org.springframework.core.type.filter.AssignableTypeFilter;import org.springframework.core.type.filter.TypeFilter;import org.springframework.util.StringUtils;public class ClassPathMapperScanner  extends ClassPathBeanDefinitionScanner{  private boolean addToConfig = true;  private SqlSessionFactory sqlSessionFactory;  private SqlSessionTemplate sqlSessionTemplate;  private String sqlSessionTemplateBeanName;  private String sqlSessionFactoryBeanName;  private Class
     annotationClass;  private Class
     markerInterface;    public ClassPathMapperScanner(BeanDefinitionRegistry registry)  {    super(registry, false);  }    public void setAddToConfig(boolean addToConfig)  {    this.addToConfig = addToConfig;  }    public void setAnnotationClass(Class
     annotationClass)  {    this.annotationClass = annotationClass;  }    public void setMarkerInterface(Class
     markerInterface)  {    this.markerInterface = markerInterface;  }    public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory)  {    this.sqlSessionFactory = sqlSessionFactory;  }    public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate)  {    this.sqlSessionTemplate = sqlSessionTemplate;  }    public void setSqlSessionTemplateBeanName(String sqlSessionTemplateBeanName)  {    this.sqlSessionTemplateBeanName = sqlSessionTemplateBeanName;  }    public void setSqlSessionFactoryBeanName(String sqlSessionFactoryBeanName)  {    this.sqlSessionFactoryBeanName = sqlSessionFactoryBeanName;  }    public void registerFilters()  {    boolean acceptAllInterfaces = true;    if (this.annotationClass != null)    {      addIncludeFilter(new AnnotationTypeFilter(this.annotationClass));      acceptAllInterfaces = false;    }    if (this.markerInterface != null)    {      addIncludeFilter(new AssignableTypeFilter(this.markerInterface)      {        protected boolean matchClassName(String className)        {          return false;        }      });      acceptAllInterfaces = false;    }    if (acceptAllInterfaces) {      addIncludeFilter(new TypeFilter()      {        public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory)          throws IOException        {          return true;        }      });    }    addExcludeFilter(new TypeFilter()    {      public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory)        throws IOException      {        String className = metadataReader.getClassMetadata().getClassName();        return className.endsWith("package-info");      }    });  }  // 对某个包下的所有类 扫描通过 spring BeanDefinitionHolder 对接口进行 内部属性操作  public Set
    
      doScan(String... basePackages)  {    Set
     
       beanDefinitions = super.doScan(basePackages);    if (beanDefinitions.isEmpty()) {      this.logger.warn("No MyBatis mapper was found in '" + Arrays.toString(basePackages) + "' package. Please check your configuration.");    } else {      for (BeanDefinitionHolder holder : beanDefinitions)      {        GenericBeanDefinition definition = (GenericBeanDefinition)holder.getBeanDefinition();        if (this.logger.isDebugEnabled()) {          this.logger.debug("Creating MapperFactoryBean with name '" + holder.getBeanName() + "' and '" + definition.getBeanClassName() + "' mapperInterface");        }        //添加自己在 mybatis mapper 中 对应的mapper key        definition.getPropertyValues().add("mapperInterface", definition.getBeanClassName());                //设置bean 的  class 为 MapperFactoryBean        definition.setBeanClass(MapperFactoryBean.class);                //是否添加到 配置中心         definition.getPropertyValues().add("addToConfig", Boolean.valueOf(this.addToConfig));                boolean explicitFactoryUsed = false;        if (StringUtils.hasText(this.sqlSessionFactoryBeanName))        {          //添加 sqlSessionFactory用于获取  数据库连接          definition.getPropertyValues().add("sqlSessionFactory", new RuntimeBeanReference(this.sqlSessionFactoryBeanName));          explicitFactoryUsed = true;        }        else if (this.sqlSessionFactory != null)        {          definition.getPropertyValues().add("sqlSessionFactory", this.sqlSessionFactory);          explicitFactoryUsed = true;        }        if (StringUtils.hasText(this.sqlSessionTemplateBeanName))        {          if (explicitFactoryUsed) {            this.logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");          }          definition.getPropertyValues().add("sqlSessionTemplate", new RuntimeBeanReference(this.sqlSessionTemplateBeanName));          explicitFactoryUsed = true;        }        else if (this.sqlSessionTemplate != null)        {          if (explicitFactoryUsed) {            this.logger.warn("Cannot use both: sqlSessionTemplate and sqlSessionFactory together. sqlSessionFactory is ignored.");          }          definition.getPropertyValues().add("sqlSessionTemplate", this.sqlSessionTemplate);          explicitFactoryUsed = true;        }        if (!explicitFactoryUsed)        {          if (this.logger.isDebugEnabled()) {            this.logger.debug("Enabling autowire by type for MapperFactoryBean with name '" + holder.getBeanName() + "'.");          }          definition.setAutowireMode(2);        }      }    }    return beanDefinitions;  }    protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition)  {    return (beanDefinition.getMetadata().isInterface()) && (beanDefinition.getMetadata().isIndependent());  }    protected boolean checkCandidate(String beanName, BeanDefinition beanDefinition)    throws IllegalStateException  {    if (super.checkCandidate(beanName, beanDefinition)) {      return true;    }    this.logger.warn("Skipping MapperFactoryBean with name '" + beanName + "' and '" + beanDefinition.getBeanClassName() + "' mapperInterface" + ". Bean already defined with the same name!");        return false;  }}