Bug 151381 [Smoke]The parameter didn't display in the web viewer
Description: Preview a parameter in the web viewer, it can't be previewed. Step to reproduce: 1. new a report and a parameter 2. drag it to the layout 3. preview it in the web viewer Actual result: the parameter is not displayed
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
* 		Double.valueOf(String);
	 * @param source
	 * @return
	 * @throws BirtException
	 */
	public static Double toDouble( Object source ) throws BirtException
	{
		if ( source == null )
			return null;
		if ( source instanceof Double )
		{
			return (Double) source;
		}
		else if ( source instanceof Number )
		{
			
			double doubleValue = ( (Number) source ).doubleValue( );
			return new Double( doubleValue );
		}
		else if ( source instanceof Boolean )
		{
			if ( true == ( (Boolean) source ).booleanValue( ) )
				return new Double( 1d );
			return new Double( 0d );
		}
		else if ( source instanceof Date )
		{
			double doubleValue = ( (Date) source ).getTime( );
			return new Double( doubleValue );
		}