valhelper.java.svn-base

来自「一个timesheet程序,用来统计开发人员的度量衡web在线程序.用于软件行业」· SVN-BASE 代码 · 共 65 行

package com.nsi.util;

import java.util.Map;

/**
 * @author Chris Ye, created on Sep 24, 2008
 *
 * ValHelper
 */
public final class ValHelper
{
	private static final String EMPTYSTR = "";
	/**
	 * private constructor of ValHelper, prevent instantiation
	 */
	private ValHelper()
	{
	}
	private static class ValHelperHolder
	{
		static final ValHelper valHelper = new ValHelper();
	}
	/**
	 * @return an instance of ValHelper
	 */
	public static ValHelper getInstance()
	{
		return ValHelperHolder.valHelper;
	}
	public boolean isNotNullAndEmpty(String valStr)
	{
		boolean flag = false;
		if((valStr != null) && (!((EMPTYSTR).equalsIgnoreCase(valStr.trim()))))
		{
			flag = true;
		}
		return flag;
	}
	public boolean isNullOrEmpty(String valStr)
	{
		boolean flag = false;
		if((valStr == null) || ((EMPTYSTR).equalsIgnoreCase(valStr.trim())))
		{
			flag = true;
		}
		return flag;
	}
	public String getValue(Map<String,String> valMap, String key)
	{
		String retVal = EMPTYSTR;
		if( isNotNullAndEmpty(key))
		{
			if(( valMap != null ) && ( !valMap.isEmpty()) )
			{
				String result = valMap.get(key);
				if(  isNotNullAndEmpty(result))
				{
					retVal = result;
				}
			}
		}
		return retVal.trim();
	}
}