Bug 130688 ULocal unsupported(Data)
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
return toDate( source );
			case DataType.DOUBLE_TYPE :
				return toDouble( source );
			case DataType.STRING_TYPE :
				return toString( source );
			case DataType.BLOB_TYPE :
				return toBlob( source );
			case DataType.BINARY_TYPE :
				return toBytes( source );
			default :
				throw new BirtException( pluginId, ResourceConstants.INVALID_TYPE,
						resourceBundle );
		}
	}
	
	/**
	 * convert a object to given class
	 * Classes supported:
	 * 		Integer.class
	 * 		BigDecimal.class
	 * 		Boolean.class
	 * 		Date.class
	 * 		Double.class
	 * 		String.class
	 * 		Blob.class
	 * @param source
	 * @param toTypeClass
	 * @return
	 * @throws BirtException
	 */