简介

提供常用及通用的工具类

将列表转换为树形结构工具类

TreeListUtils

将原始列表转换为树形结构

    /**
     * 调用转换树型结构测试方法
     *
     * @param list 原始数据
	 * @return 树形结构数据
     */
    private List<Demo> performConversionTest(List<Demo> list) {
        String childrenFieldName = "children";
        Predicate<Integer> isRootPredicate = parentId -> parentId == null || -1 == parentId;
        return TreeListUtils.convert(list, childrenFieldName, isRootPredicate,  Demo::getId, Demo::getPid);
    }

将原始列表转换为树形结构-并将关联对象添加进去树形结构

    /**
     * 调用转换树型结构测试方法-并将关联对象添加进去树形结构
     *
     * @param list 原始数据
	 * @return 树形结构数据
     */
    private List<Demo> performConversionTest(List<Demo> list) {
	    Map<Integer, Data> idData = new HashMap<>();
        idData.put(0, new Data(0, "ce0"));
        idData.put(1, new Data(1, "ce1"));
        idData.put(10, new Data(10, "ce10"));
        idData.put(20, new Data(20, "ce20"));
		
        String childrenFieldName = "children";
        Predicate<Integer> isRootPredicate = parentId -> parentId == null || parentId == -1;
        String dataFieldName = "data";
		
        return TreeListUtils.convert(list, childrenFieldName, isRootPredicate, Demo::getId, Demo::getPid, idData, dataFieldName, Demo::getId);
    }

唯一主键工厂及默认实现

IdFactory

默认的 IdGenerate 实现类 获取主键

    @Test
    public void testGenerate() {
        Long generatedId = IdFactory.generate();
        log.info("IdFactory.generate():{}", generatedId);
        assertNotNull(generatedId);

        String generatedIdStr = IdFactory.generateStr();
        log.info("IdFactory.generateStr():{}", generatedIdStr);
        assertNotNull(generatedIdStr);
    }

自定义实现IdGenerate，初始化工厂使用; 完成后清除自定义实现，重新调用默认实现
注：在IdFactory.initialize前若已经使用初始化工厂应先清除IdFactory.clear()

public class IdGenerateCustomImpl implements IdGenerate {
    @Override
    public Long generate() {
        return 1L;
    }

    @Override
    public String generateStr() {
        return "test";
    }
}

    @Test
    public void testGenerateCustomImpl() {
        Supplier<IdGenerate> impl = IdGenerateCustomImpl::new;
        IdFactory.initialize(impl);
        assertEquals(IdFactory.generateStr(), "test");
        assertEquals(IdFactory.generate(), 1L);

        IdFactory.clear();
        testGenerate();
    }