Bug 122584 Cascading parameter values can't be displayed properly in html viewer.
Description: Cascading parameter values can't be displayed properly in html viewer. Steps to reproduce: 1. Preview attached design file in html viewer. 2. Click on "change parameter" button in html viewer. 3. Select the first parameter value and expect that the second parameter value in the same cascading parameter group could be displayed, but it is not displayed.
core/org.eclipse.birt.core/src/org/eclipse/birt/core/data/DataTypeUtil.java
if ( clazz == null )
			return DataType.UNKNOWN_TYPE;
		if ( clazz == DataType.AnyType.class )
			return DataType.ANY_TYPE;
		else if ( Integer.class.isAssignableFrom(clazz) )
			return DataType.INTEGER_TYPE;
		else if ( Double.class.isAssignableFrom(  clazz ))
			return DataType.DOUBLE_TYPE;
		else if ( String.class.isAssignableFrom( clazz ))
			return DataType.STRING_TYPE;
		else if ( BigDecimal.class.isAssignableFrom( clazz ))
			return DataType.DECIMAL_TYPE;
		else if (Date.class.isAssignableFrom( clazz ))
			return DataType.DATE_TYPE;
		else if ( byte[].class.isAssignableFrom( clazz))
			return DataType.BINARY_TYPE;
		
		else if ( clazz.getName().equals( 
				"org.eclipse.datatools.connectivity.oda.IClob" ) )
			return DataType.STRING_TYPE;
		else if ( clazz.getName( ).equals( 
				"org.eclipse.datatools.connectivity.oda.IBlob" ) )
			return DataType.BINARY_TYPE;
		
		return DataType.UNKNOWN_TYPE;
	}
	
	/**
	 * Convert object to a suitable type from its value 
	 * Object -> Integer -> Double -> BigDecimal -> Date -> String