com.feingto.cloud.kit.reflection.BeanConvertKit Maven / Gradle / Ivy

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package com.feingto.cloud.kit.reflection;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;

import java.beans.FeatureDescriptor;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * Bean属性转换工具类
 *
 * @author longfei
 */
@Slf4j
public abstract class BeanConvertKit extends org.springframework.beans.BeanUtils {
    /**
     * 把Bean数据转换到另外一个类的对象中
     *
     * @param source           数据源
     * @param targetClass      目标对象的类
     * @param ignoreProperties 忽略属性
     * @return 目标对象
     */
    public static  T convert(Object source, Class targetClass, String... ignoreProperties) {
        if (Objects.isNull(source)) {
            return null;
        }

        try {
            T target = targetClass.newInstance();
            copyProperties(source, target, ignoreProperties);
            return target;
        } catch (InstantiationException e) {
            log.error("Can't create Instance of Class:" + targetClass, e);
        } catch (IllegalAccessException e) {
            log.error("Can't access construct method of Class:" + targetClass, e);
        }

        return null;
    }

    /**
     * 把Bean集合数据转换到另外一个类的集合对象中
     *
     * @param sources          数据源集合
     * @param targetClass      目标对象的类
     * @param ignoreProperties 忽略属性
     * @return 目标对象
     */
    public static  List convert(Collection sources, Class targetClass, String... ignoreProperties) {
        if (Objects.isNull(sources)) {
            return null;
        }

        return sources.stream()
                .map(obj -> convert(obj, targetClass, ignoreProperties))
                .collect(Collectors.toList());
    }

    /**
     * 把Bean数据转换到另外一个类的对象中，源对象的空值不转换
     *
     * @param source 数据源
     * @param target 目标对象
     */
    public static void copyProperties(Object source, Object target) throws BeansException {
        copyProperties(source, target, "");
    }

    /**
     * 把Bean数据转换到另外一个类的对象中，源对象的空值不转换
     *
     * @param source           数据源
     * @param target           目标对象
     * @param ignoreProperties 忽略属性
     */
    public static void copyProperties(Object source, Object target, String... ignoreProperties) throws BeansException {
        Stream.of(getPropertyDescriptors(target.getClass()))
                .filter(targetPd -> Objects.nonNull(targetPd.getWriteMethod()))
                .filter(targetPd -> !Arrays.asList(ignoreProperties).contains(targetPd.getName()))
                .forEach(targetPd -> {
                    PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
                    if (Objects.nonNull(sourcePd) && Objects.nonNull(sourcePd.getReadMethod())) {
                        try {
                            Method readMethod = sourcePd.getReadMethod();
                            if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
                                readMethod.setAccessible(true);
                            }
                            Object value = readMethod.invoke(source);
                            // 源对象属性不为空（这里也能进行一些特殊要求的处理，例如绑定时格式转换等）
                            if (Objects.nonNull(value)) {
                                Method writeMethod = targetPd.getWriteMethod();
                                if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
                                    writeMethod.setAccessible(true);
                                }
                                writeMethod.invoke(target, value);
                            }
                        } catch (Exception e) {
                            throw new FatalBeanException("Could not copy properties from source to target", e);
                        }
                    }
                });
    }

    /**
     * 提取对象的空属性
     *
     * @param source 数据源
     */
    public static String[] getNullProperties(Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        return Stream.of(src.getPropertyDescriptors())
                .filter(pd -> Objects.isNull(src.getPropertyValue(pd.getName())))
                .map(FeatureDescriptor::getName)
                .distinct()
                .toArray(String[]::new);
    }
}