examcloud-components/src/main/java/cn/com/qmth/examcloud/commons/helpers/DynamicEnumManager.java

package cn.com.qmth.examcloud.commons.helpers;

import java.io.File;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;

import com.google.common.collect.Maps;
import com.thoughtworks.xstream.XStream;

import cn.com.qmth.examcloud.commons.exception.ExamCloudRuntimeException;
import cn.com.qmth.examcloud.commons.util.PathUtil;

/**
 * 动态属性管理器
 *
 * @author WANGWEI
 * @date 2018年8月23日
 * @Copyright (c) 2018-? http://qmth.com.cn All Rights Reserved.
 */
public class DynamicEnumManager {

	private List<DynamicEnum> enums;

	private Map<String, DynamicEnum> nameIndex;

	private Map<Long, DynamicEnum> idIndex;

	/**
	 * 构造函数
	 *
	 */
	private DynamicEnumManager() {
		super();
	}

	/**
	 * 方法注释
	 *
	 * @author WANGWEI
	 * @param xmlResourcePath
	 * @return
	 */
	public static DynamicEnumManager newInstance(String xmlResourcePath) {
		DynamicEnumManager manager = new DynamicEnumManager();

		String resoucePath = PathUtil.getResoucePath(xmlResourcePath);
		File file = new File(resoucePath);

		XStream xStream = XStreamBuilder.newInstance().build();
		xStream.allowTypes(new Class[]{DynamicEnum.class, List.class});
		xStream.alias("enums", List.class);
		xStream.alias("enum", DynamicEnum.class);

		@SuppressWarnings("unchecked")
		List<DynamicEnum> list = (List<DynamicEnum>) xStream.fromXML(file);
		manager.enums = list;

		manager.nameIndex = Maps.newHashMap();
		manager.idIndex = Maps.newHashMap();

		for (DynamicEnum cur : manager.enums) {
			String valueTpye = cur.getValueType();
			if (StringUtils.isBlank(valueTpye)) {
				cur.setValueType(null);
			} else {
				try {
					BasicDataType dataType = BasicDataType.valueOf(valueTpye);
					cur.setValueType(dataType.name());
				} catch (Exception e) {
					throw new RuntimeException("valueTpye is wrong. valueTpye=" + valueTpye);
				}

			}
			cur.setName(cur.getName().trim());
			cur.setDesc(cur.getDesc().trim());
			manager.nameIndex.put(cur.getName(), cur);
			manager.idIndex.put(cur.getId(), cur);
		}

		return manager;
	}

	/**
	 * 方法注释
	 *
	 * @author WANGWEI
	 * @param name
	 * @return
	 */
	public DynamicEnum getByName(String name) {
		DynamicEnum dynamicEnum = nameIndex.get(name);
		if (null != dynamicEnum) {
			return dynamicEnum;
		}
		throw new ExamCloudRuntimeException("动态枚举不存在. name=" + name);
	}

	/**
	 * 方法注释
	 *
	 * @author WANGWEI
	 * @param name
	 * @return
	 */
	public Long getIdByName(String name) {
		DynamicEnum dynamicEnum = nameIndex.get(name);
		if (null != dynamicEnum) {
			return dynamicEnum.getId();
		}
		throw new ExamCloudRuntimeException("动态枚举不存在. name=" + name);
	}

	/**
	 * 方法注释
	 *
	 * @author WANGWEI
	 * @param id
	 * @return
	 */
	public DynamicEnum getById(Long id) {
		DynamicEnum dynamicEnum = idIndex.get(id);
		if (null != dynamicEnum) {
			return dynamicEnum;
		}
		throw new ExamCloudRuntimeException("动态枚举不存在. id=" + id);
	}

	/**
	 * 方法注释
	 *
	 * @author WANGWEI
	 * @param id
	 * @return
	 */
	public String getNameById(Long id) {
		DynamicEnum dynamicEnum = idIndex.get(id);
		if (null != dynamicEnum) {
			return dynamicEnum.getName();
		}
		throw new ExamCloudRuntimeException("动态枚举不存在. id=" + id);
	}

}