Bug 153896 Improve the performance of BIRT datetime-converting
The current datetime converting algorithm in birt.core, xml&flatfile ODA implementations are not efficient enough.This is because we use java's SimpleDateTimeFormatter to parse ISO8601 compatible date/time values. We should write our own datatime string parser for ISO8601 datetime format.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
{
			try
			{
				return new Integer( Double.valueOf( (String) source )
						.intValue( ) );
			}
			catch ( NumberFormatException e )
			{
				throw new BirtException( pluginId,
						ResourceConstants.CONVERT_FAILS,
						new Object[]{
								source.toString( ), "Integer"
						},
						resourceBundle );
			}
		}
		else
		{
			throw new BirtException( pluginId,
					ResourceConstants.CONVERT_FAILS,
					new Object[]{
							source.toString( ), "Integer"
					},
					resourceBundle );
		}
	}
	/**
	 * Boolean -> BigDecimal
	 * 		true 	-> 1
	 * 		others 	-> 0