org.aoju.bus.mapper.handler.AbstractSqlHandler Maven / Gradle / Ivy
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package org.aoju.bus.mapper.handler;
import org.aoju.bus.core.lang.Symbol;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
import java.lang.reflect.Proxy;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* SQL 拦截处理器
*
* @author Kimi Liu
* @since Java 17+
*/
public abstract class AbstractSqlHandler implements SQLHandler {
public static final String DELEGATE_BOUNDSQL = "delegate.boundSql";
public static final String DELEGATE_BOUNDSQL_SQL = "delegate.boundSql.sql";
public static final String DELEGATE_MAPPEDSTATEMENT = "delegate.mappedStatement";
public static final String MAPPEDSTATEMENT = "mappedStatement";
/**
* SQL 解析缓存
* key 可能是 mappedStatement 的 ID,也可能是 class 的 name
*/
private static final Map SQL_PARSER_CACHE = new ConcurrentHashMap<>();
/**
* 获取 SqlParser 注解信息
*
* @param metaObject 元数据对象
* @return the true/false
*/
protected static boolean getSqlParserInfo(MetaObject metaObject) {
String id = getMappedStatement(metaObject).getId();
Boolean value = SQL_PARSER_CACHE.get(id);
if (null != value) {
return value;
}
String mapperName = id.substring(0, id.lastIndexOf(Symbol.DOT));
return SQL_PARSER_CACHE.getOrDefault(mapperName, false);
}
/**
* 获取当前执行 MappedStatement
*
* @param metaObject 元对象
* @return 映射语句
*/
protected static MappedStatement getMappedStatement(MetaObject metaObject) {
return (MappedStatement) metaObject.getValue(DELEGATE_MAPPEDSTATEMENT);
}
/**
* 获取当前执行 MappedStatement
*
* @param metaObject 元对象
* @param property 元素属性
* @return 映射语句
*/
protected static MappedStatement getMappedStatement(MetaObject metaObject, String property) {
return (MappedStatement) metaObject.getValue(property);
}
/**
* 获得真正的处理对象,可能多层代理
*
* @param 泛型
* @param target 对象
* @return the object
*/
protected static T realTarget(Object target) {
if (Proxy.isProxyClass(target.getClass())) {
MetaObject metaObject = SystemMetaObject.forObject(target);
return realTarget(metaObject.getValue("h.target"));
}
return (T) target;
}
}