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package com.github.javaclub.cdl.client.common;

import com.github.javaclub.cdl.client.group.DBSelector;
import com.github.javaclub.cdl.client.util.ThreadLocalMap;


public class ThreadLocalDataSourceIndex {
	public static boolean existsIndex() {
		return getIndexAsObject() != null;
	}

	public static Integer getIndexAsObject() {
		Integer indexObject = null;
		try {
			indexObject = (Integer) ThreadLocalMap.get(ThreadLocalString.DATASOURCE_INDEX);
			if (indexObject == null)
				return null;

			return indexObject;
		} catch (Exception e) {
			throw new IllegalArgumentException(msg(indexObject));
		}
	}

	public static int getIndex() {
		Integer indexObject = null;
		try {
			indexObject = (Integer) ThreadLocalMap.get(ThreadLocalString.DATASOURCE_INDEX);
			if (indexObject == null)
				return DBSelector.NOT_EXIST_USER_SPECIFIED_INDEX;

			int index = indexObject.intValue();
			if (index < 0)
				throw new IllegalArgumentException(msg(indexObject));

			return index;
		} catch (Exception e) {
			throw new IllegalArgumentException(msg(indexObject));
		}
	}
	
	public static void clearIndex() {
		ThreadLocalMap.remove(ThreadLocalString.DATASOURCE_INDEX);
	}
	
	private static String msg(Integer indexObject) {
		return indexObject + " 不是一个有效的数据源索引，索引只能是大于0的数字";
	}
}