Bug 130688 ULocal unsupported(Data)
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "BigDecimal"
					},
					resourceBundle );
		}
	}
	/**
	 * Number -> Boolean
	 * 		0 		-> false
	 * 		others 	-> true
	 * String -> Boolean
	 * 		"true" 	-> true (ignore case)
	 * 		"false" -> false (ignore case)
	 * 		other string will throw an exception
	 * Date -> Boolean
	 * 		throw exception
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static Boolean toBoolean( Object source ) throws BirtException
	{
		if ( source == null )
			return null;
		
		if ( source instanceof Boolean )
		{
			return (Boolean) source;