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package cn.hutool.extra.cglib;

import cn.hutool.core.map.WeakConcurrentMap;
import cn.hutool.core.util.StrUtil;
import net.sf.cglib.beans.BeanCopier;
import net.sf.cglib.core.Converter;

/**
 * BeanCopier属性缓存
* 缓存用于防止多次反射造成的性能问题 * * @author Looly * @since 5.4.1 */ public enum BeanCopierCache { /** * BeanCopier属性缓存单例 */ INSTANCE; private final WeakConcurrentMap cache = new WeakConcurrentMap<>(); /** * 获得类与转换器生成的key在{@link BeanCopier}的Map中对应的元素 * * @param srcClass 源Bean的类 * @param targetClass 目标Bean的类 * @param converter 转换器 * @return Map中对应的BeanCopier */ public BeanCopier get(Class srcClass, Class targetClass, Converter converter) { return get(srcClass, targetClass, null != converter); } /** * 获得类与转换器生成的key在{@link BeanCopier}的Map中对应的元素 * * @param srcClass 源Bean的类 * @param targetClass 目标Bean的类 * @param useConverter 是否使用转换器 * @return Map中对应的BeanCopier * @since 5.8.0 */ public BeanCopier get(Class srcClass, Class targetClass, boolean useConverter) { final String key = genKey(srcClass, targetClass, useConverter); return cache.computeIfAbsent(key, () -> BeanCopier.create(srcClass, targetClass, useConverter)); } /** * 获得类与转换器生成的key
* 结构类似于:srcClassName#targetClassName#1 或者 srcClassName#targetClassName#0 * * @param srcClass 源Bean的类 * @param targetClass 目标Bean的类 * @param useConverter 是否使用转换器 * @return 属性名和Map映射的key */ private String genKey(Class srcClass, Class targetClass, boolean useConverter) { final StringBuilder key = StrUtil.builder() .append(srcClass.getName()) .append('#').append(targetClass.getName()) .append('#').append(useConverter ? 1 : 0); return key.toString(); } }




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