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com.adrninistrator.javacg2.spring.UseSpringBeanByAnnotationHandler Maven / Gradle / Ivy
package com.adrninistrator.javacg2.spring;
import com.adrninistrator.javacg2.common.SpringAnnotationConstants;
import com.adrninistrator.javacg2.dto.classes.ClassExtendsInfo;
import com.adrninistrator.javacg2.extensions.codeparser.SpringXmlBeanParserInterface;
import com.adrninistrator.javacg2.util.JavaCG2AnnotationUtil;
import com.adrninistrator.javacg2.util.JavaCG2ClassMethodUtil;
import com.adrninistrator.javacg2.util.JavaCG2Util;
import org.apache.bcel.classfile.AnnotationEntry;
import org.apache.bcel.classfile.Field;
import org.apache.bcel.classfile.JavaClass;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author adrninistrator
* @date 2022/10/3
* @description: 处理通过注解使用Spring Bean的信息
*/
public class UseSpringBeanByAnnotationHandler {
private static final Logger logger = LoggerFactory.getLogger(UseSpringBeanByAnnotationHandler.class);
private final Map classExtendsInfoMap;
private final Map> classImplementsInfoMap;
private final Map> interfaceExtendsInfoMap;
private final DefineSpringBeanByAnnotationHandler defineSpringBeanByAnnotationHandler;
private final SpringXmlBeanParserInterface springXmlBeanParser;
/*
保存各个类中使用的Spring Bean字段信息
key: 完整类名
value: 内层Map
key: 字段名称
value: Spring Bean名称，空字符串代表不需要转换为具体的类型；非空字段串代表转换为具体的类型
*/
private final Map> classFieldSpringBeanNameMap = new HashMap<>(100);
/*
保存各个类中使用的Spring Bean类型信息，仅当字段使用@Resource注解的type属性时会被记录下来
key: 完整类名
value: 内层Map
key: 字段名称
value: Spring Bean类型
*/
private final Map> classFieldSpringBeanTypeMap = new HashMap<>();
/*
保存各个类中使用的@Autowired、@Inject注解的字段信息
key: 完整类名
value: 内层Map
key: 字段名称
value: 字段类型
*/
private final Map> classAutowiredFieldInfoMap = new HashMap<>(100);
/*
保存各个类中使用了@Autowired、@Inject注解的字段匹配的Spring Bean类型列表
key: 完整类名
value: 内层Map
key: 字段名称
value: 字段匹配的Spring Bean类型列表
*/
private final Map>> classAutowiredFieldMatchedTypeMap = new HashMap<>(100);
// 是否有通过注解使用Spring Bean
private boolean useSpringBean = false;
public UseSpringBeanByAnnotationHandler(Map classExtendsInfoMap,
Map> classImplementsInfoMap,
Map> interfaceExtendsInfoMap,
DefineSpringBeanByAnnotationHandler defineSpringBeanByAnnotationHandler,
SpringXmlBeanParserInterface springXmlBeanParser) {
this.classExtendsInfoMap = classExtendsInfoMap;
this.classImplementsInfoMap = classImplementsInfoMap;
this.interfaceExtendsInfoMap = interfaceExtendsInfoMap;
this.defineSpringBeanByAnnotationHandler = defineSpringBeanByAnnotationHandler;
this.springXmlBeanParser = springXmlBeanParser;
if (springXmlBeanParser != null) {
logger.info("指定 {} 实例 {}", SpringXmlBeanParserInterface.class.getSimpleName(), springXmlBeanParser.getClass().getName());
} else {
logger.info("未指定 {} 实例", SpringXmlBeanParserInterface.class.getSimpleName());
}
}
/**
* 记录类中带有Spring相关注解的字段信息
*
* @param javaClass
*/
public void recordClassFieldsWithSpringAnnotation(JavaClass javaClass) {
String className = javaClass.getClassName();
Map fieldSpringBeanNameMap = new HashMap<>(10);
Map fieldSpringBeanTypeMap = new HashMap<>(2);
for (Field field : javaClass.getFields()) {
// 处理字段的Spring相关注解信息
handleFieldWithSpringAnnotation(className, field, fieldSpringBeanNameMap, fieldSpringBeanTypeMap);
}
if (!fieldSpringBeanNameMap.isEmpty()) {
useSpringBean = true;
classFieldSpringBeanNameMap.put(className, fieldSpringBeanNameMap);
}
if (!fieldSpringBeanTypeMap.isEmpty()) {
useSpringBean = true;
classFieldSpringBeanTypeMap.put(className, fieldSpringBeanTypeMap);
}
}
/**
* 处理字段的Spring相关注解信息
*
* @param className
* @param field
* @param fieldSpringBeanNameMap
* @param fieldSpringBeanTypeMap
*/
private void handleFieldWithSpringAnnotation(String className,
Field field,
Map fieldSpringBeanNameMap,
Map fieldSpringBeanTypeMap) {
String fieldName = field.getName();
AnnotationEntry resourceAnnotationEntry = null;
AnnotationEntry autowiredAnnotationEntry = null;
AnnotationEntry qualifierAnnotationEntry = null;
AnnotationEntry namedAnnotationEntry = null;
AnnotationEntry injectAnnotationEntry = null;
for (AnnotationEntry annotationEntry : field.getAnnotationEntries()) {
if (SpringAnnotationConstants.ANNOTATION_NAME_RESOURCE.equals(annotationEntry.getAnnotationType())) {
resourceAnnotationEntry = annotationEntry;
} else if (SpringAnnotationConstants.ANNOTATION_NAME_AUTOWIRED.equals(annotationEntry.getAnnotationType())) {
autowiredAnnotationEntry = annotationEntry;
} else if (SpringAnnotationConstants.ANNOTATION_NAME_QUALIFIER.equals(annotationEntry.getAnnotationType())) {
qualifierAnnotationEntry = annotationEntry;
} else if (SpringAnnotationConstants.ANNOTATION_NAME_NAMED.equals(annotationEntry.getAnnotationType())) {
namedAnnotationEntry = annotationEntry;
} else if (SpringAnnotationConstants.ANNOTATION_NAME_INJECT.equals(annotationEntry.getAnnotationType())) {
injectAnnotationEntry = annotationEntry;
}
}
if (resourceAnnotationEntry != null) {
// 字段上存在@Resource注解
String typeAttributeValue = JavaCG2AnnotationUtil.getAnnotationAttributeStringValue(resourceAnnotationEntry, SpringAnnotationConstants.ANNOTATION_ATTRIBUTE_TYPE);
if (typeAttributeValue != null) {
// @Resource注解获取到了type属性值，后续处理跳过，不处理name属性
fieldSpringBeanTypeMap.put(fieldName, typeAttributeValue);
return;
}
}
// @Resource注解未获取到type属性值，后续处理不跳过，处理name属性
// 获取带有Spring注解的字段对应的Bean名称
String beanName = getSpringBeanNameOfField(resourceAnnotationEntry, autowiredAnnotationEntry, qualifierAnnotationEntry, namedAnnotationEntry,
injectAnnotationEntry, fieldName);
if (beanName == null) {
// 未获取到Bean的名称，不向以下Map中添加
return;
}
if ((autowiredAnnotationEntry != null && qualifierAnnotationEntry == null) || injectAnnotationEntry != null) {
// 当前使用的是不带@Qualifier注解的@Autowired注解，或者@Inject注解
// 记录当前的字段名称，及字段类型
Map autowiredFieldInfoMap = classAutowiredFieldInfoMap.computeIfAbsent(className, k -> new HashMap<>());
autowiredFieldInfoMap.put(fieldName, field.getType().toString());
}
// 记录字段的名称及对应的Bean的名称
fieldSpringBeanNameMap.put(fieldName, beanName);
}
/**
* 获取带有Spring注解的字段对应的Bean名称
*
* @param resourceAnnotationEntry
* @param autowiredAnnotationEntry
* @param qualifierAnnotationEntry
* @param namedAnnotationEntry
* @param injectAnnotationEntry
* @param fieldName
* @return
*/
private String getSpringBeanNameOfField(AnnotationEntry resourceAnnotationEntry,
AnnotationEntry autowiredAnnotationEntry,
AnnotationEntry qualifierAnnotationEntry,
AnnotationEntry namedAnnotationEntry,
AnnotationEntry injectAnnotationEntry,
String fieldName) {
if (resourceAnnotationEntry == null && autowiredAnnotationEntry == null && injectAnnotationEntry == null) {
// 字段上没有@Resource、@Autowired、@Inject注解
// 返回null，代表字段不是Spring Bean
return null;
}
if (resourceAnnotationEntry != null) {
// 字段上有@Resource注解，获取name属性值
String nameOfResource = JavaCG2AnnotationUtil.getAnnotationAttributeStringValue(resourceAnnotationEntry, SpringAnnotationConstants.ANNOTATION_ATTRIBUTE_NAME);
if (nameOfResource == null) {
// @Resource注解name属性值为空，返回字段名称
return fieldName;
}
return nameOfResource;
}
if (injectAnnotationEntry != null) {
// 字段上有@Inject注解
if (namedAnnotationEntry == null) {
// 字段上没有@Named注解，返回字段名称
return fieldName;
}
// 字段上有@Named注解
String valueOfNamed = JavaCG2AnnotationUtil.getAnnotationAttributeStringValue(namedAnnotationEntry, SpringAnnotationConstants.ANNOTATION_ATTRIBUTE_VALUE);
if (StringUtils.isBlank(valueOfNamed)) {
// @Named注解的value属性值为空，返回字段名称
return fieldName;
}
// @Named注解的value属性值非空，返回value属性值
return valueOfNamed;
}
// 字段上有@Autowired注解
if (qualifierAnnotationEntry == null) {
// 字段上没有@Qualifier注解，返回字段名称
return fieldName;
}
// 字段上有@Qualifier注解
String valueOfQualifier = JavaCG2AnnotationUtil.getAnnotationAttributeStringValue(qualifierAnnotationEntry, SpringAnnotationConstants.ANNOTATION_ATTRIBUTE_VALUE);
if (StringUtils.isBlank(valueOfQualifier)) {
// @Qualifier注解的value属性值为空，返回字段名称
return fieldName;
}
// @Qualifier注解的value属性值非空，返回value属性值
return valueOfQualifier;
}
/**
* 获取指定类指定字段对应的Spring Bean类型列表
*
* @param className
* @param fieldName
* @return
*/
public List getSpringBeanTypeList(String className, String fieldName) {
// 获取指定类指定字段对应的Spring Bean的类型，通过注解中的type属性获取
String springBeanType = getSpringBeanTypeByAnnotationType(className, fieldName);
if (springBeanType != null) {
return Collections.singletonList(springBeanType);
}
// 获取指定类指定字段对应的Spring Bean名称
String springBeanName = getSpringBeanName(className, fieldName);
if (springBeanName == null) {
return Collections.emptyList();
}
// 获取指定类指定字段对应的Spring Bean类型列表
List springBeanTypeList = defineSpringBeanByAnnotationHandler.getSpringBeanTypeList(springBeanName);
if (!JavaCG2Util.isCollectionEmpty(springBeanTypeList)) {
// 检查@Autowired、@Inject注解的字段类型与Spring Bean类型是否匹配（使用@Autowired注解时未指定@Qualifier注解）
return checkAutowiredTypeMatches(className, fieldName, springBeanTypeList);
}
if (springXmlBeanParser != null) {
// 从Spring XML中获取bean类型
String springBeanTypeInXml = springXmlBeanParser.getBeanClass(springBeanName);
if (springBeanTypeInXml != null) {
return Collections.singletonList(springBeanTypeInXml);
}
}
return Collections.emptyList();
}
/**
* 检查@Autowired、@Inject注解的字段类型与Spring Bean类型是否匹配（使用@Autowired注解时未指定@Qualifier注解）
*
* @param className
* @param fieldName
* @param springBeanTypeList
* @return 匹配的Spring Bean类型列表
*/
private List checkAutowiredTypeMatches(String className, String fieldName, List springBeanTypeList) {
Map autowiredFieldInfoMap = classAutowiredFieldInfoMap.get(className);
if (autowiredFieldInfoMap == null) {
// 当前类中没有@Autowired、@Inject注解的字段
return springBeanTypeList;
}
// 判断当前字段是否有@Autowired、@Inject注解
String fieldType = autowiredFieldInfoMap.get(fieldName);
if (fieldType == null) {
// 当前字段没有@Autowired、@Inject注解
return springBeanTypeList;
}
// 判断当前类的当前字段匹配的Spring Bean类型是否有处理过，若有则直接使用
Map> autowiredFieldMatchedTypeMap = classAutowiredFieldMatchedTypeMap.computeIfAbsent(className, k -> new HashMap<>());
List cachedMatchedTypeList = autowiredFieldMatchedTypeMap.get(fieldName);
if (cachedMatchedTypeList != null) {
return cachedMatchedTypeList;
}
List matchedSpringBeanTypeList = new ArrayList<>(springBeanTypeList.size());
for (String springBeanType : springBeanTypeList) {
if (springBeanType.equals(fieldType) ||
JavaCG2ClassMethodUtil.isChildOf(springBeanType, fieldType, classExtendsInfoMap) ||
JavaCG2ClassMethodUtil.isImplementationOf(springBeanType, fieldType, classExtendsInfoMap, classImplementsInfoMap, interfaceExtendsInfoMap)) {
/*
若满足以下任意条件，则认为类型匹配
当前字段的类型=Spring Bean类型
Spring Bean类型是当前字段的类型的子类
Spring Bean类型是当前字段的类型的实现类
*/
matchedSpringBeanTypeList.add(springBeanType);
continue;
}
// 字段类型，与字段对应的Spring Bean的类型不匹配
logger.warn("以下类获取到的字段的Spring Bean类型与字段类型不匹配 {} {} {} {}", className, fieldName, springBeanType, fieldType);
}
// 记录当前类的当前字段匹配的Spring Bean类型
autowiredFieldMatchedTypeMap.put(fieldName, matchedSpringBeanTypeList);
return matchedSpringBeanTypeList;
}
/**
* 获取指定类指定字段对应的Spring Bean的类型，通过注解中的type属性获取
*
* @param className
* @param fieldName
* @return
*/
private String getSpringBeanTypeByAnnotationType(String className, String fieldName) {
// 先从当前类的字段中获取
String springBeanFieldType = doGetSpringBeanTypeByAnnotationType(className, fieldName);
if (springBeanFieldType != null) {
return springBeanFieldType;
}
// 尝试从当前类的父类字段中获取
String currentClassName = className;
while (true) {
ClassExtendsInfo classExtendsInfo = classExtendsInfoMap.get(currentClassName);
if (classExtendsInfo == null) {
// 当前类不存在自定义父类
break;
}
currentClassName = classExtendsInfo.getSuperClassName();
if (JavaCG2ClassMethodUtil.isClassInJdk(currentClassName)) {
// 当前类父类为JDK中的类
break;
}
// 从当前类的父类字段中获取
springBeanFieldType = doGetSpringBeanTypeByAnnotationType(currentClassName, fieldName);
if (springBeanFieldType != null) {
// 假如当前字段在父类中，且为Spring Bean，则添加到当前类的Map中，避免再到父类Map中查找
Map fieldSpringBeanTypeMap = classFieldSpringBeanTypeMap.computeIfAbsent(className, k -> new HashMap<>());
fieldSpringBeanTypeMap.put(fieldName, springBeanFieldType);
break;
}
}
return springBeanFieldType;
}
/**
* 执行获取指定类指定字段对应的Spring Bean类型，通过注解中的type属性获取
*
* @param className 类名
* @param fieldName 字段名
* @return
*/
private String doGetSpringBeanTypeByAnnotationType(String className, String fieldName) {
// 获取类对应的字段及Spring Bean类型Map
Map fieldSpringBeanTypeMap = classFieldSpringBeanTypeMap.get(className);
if (fieldSpringBeanTypeMap == null) {
return null;
}
return fieldSpringBeanTypeMap.get(fieldName);
}
/**
* 获取指定类指定字段对应的Spring Bean名称
*
* @param className
* @param fieldName
* @return
*/
private String getSpringBeanName(String className, String fieldName) {
// 先从当前类的字段中获取
String springBeanFieldName = doGetSpringBeanName(className, fieldName);
if (springBeanFieldName != null) {
return springBeanFieldName;
}
// 尝试从当前类的父类字段中获取
String currentClassName = className;
while (true) {
ClassExtendsInfo ClassExtendsInfo = classExtendsInfoMap.get(currentClassName);
if (ClassExtendsInfo == null) {
// 当前类不存在自定义父类
break;
}
currentClassName = ClassExtendsInfo.getSuperClassName();
if (JavaCG2ClassMethodUtil.isClassInJdk(currentClassName)) {
// 当前类父类为JDK中的类
break;
}
// 从当前类的父类字段中获取
springBeanFieldName = doGetSpringBeanName(currentClassName, fieldName);
if (springBeanFieldName != null) {
// 假如当前字段在父类中，且为Spring Bean，则添加到当前类的Map中，避免再到父类Map中查找
Map fieldSpringBeanNameMap = classFieldSpringBeanNameMap.computeIfAbsent(className, k -> new HashMap<>());
fieldSpringBeanNameMap.put(fieldName, springBeanFieldName);
break;
}
}
return springBeanFieldName;
}
/**
* 执行获取指定类指定字段对应的Spring Bean名称
*
* @param className 类名
* @param fieldName 字段名
* @return
*/
private String doGetSpringBeanName(String className, String fieldName) {
// 获取类对应的字段及Spring Bean名称Map
Map fieldSpringBeanNameMap = classFieldSpringBeanNameMap.get(className);
if (fieldSpringBeanNameMap == null) {
return null;
}
// 获取Spring Bean名称
return fieldSpringBeanNameMap.get(fieldName);
}
public boolean hasUseSpringBean() {
return useSpringBean;
}
}
