工作日记2017.07.17

简单封装Dozer, 实现深度转换Bean<->Bean的Mapper

/******************************************************************************* * Copyright (c) 2005, 2014 springside.github.io * * Licensed under the Apache License, Version 2.0 (the "License"); *******************************************************************************/import java.util.Collection;import java.util.List;import java.util.function.Function;import java.util.stream.Collectors;import java.util.stream.Stream;import java.util.stream.StreamSupport;import org.dozer.DozerBeanMapper;import com.google.common.collect.Lists;/** * 简单封装Dozer, 实现深度转换Bean<->Bean的Mapper.实现: *  * 1. 持有Mapper的单例. * 2. 返回值类型转换. * 3. 批量转换Collection中的所有对象. * 4. 区分创建新的B对象与将对象A值复制到已存在的B对象两种函数. *  */public class BeanMapper {    /**     * 持有Dozer单例, 避免重复创建DozerMapper消耗资源.     */    private static DozerBeanMapper dozer = new DozerBeanMapper();    /**     * 基于Dozer转换对象的类型.     */    public static <T> T map(Object source, Class<T> destinationClass) {        return dozer.map(source, destinationClass);    }    /**     * 基于Dozer转换Collection中对象的类型.     */    public static <T> List<T> mapList(Iterable<?> sourceList, Class<T> destinationClass) {        List<T> destinationList = Lists.newArrayList();        for (Object sourceObject : sourceList) {            T destinationObject = dozer.map(sourceObject, destinationClass);            destinationList.add(destinationObject);        }        return destinationList;    }    /**     * 基于Dozer将对象A的值拷贝到对象B中.     */    public static void copy(Object source, Object destinationObject) {        dozer.map(source, destinationObject);    }    public static <T, S> List<T> mapList(Collection<S> source, Function<? super S, ? extends T> mapper) {        return source.stream().map(mapper).collect(Collectors.toList());    }}