AttributeRangeFilter

In this example, we want to categorize food vendors by the amount of daily traffic they have. The features are routed into an AttributeRangeFilter.

In the parameters dialog, we use the Generate… option to calculate three equal-interval ranges, based on our knowledge of the upper and lower limits of the daily traffic attribute values.

The intervals are calculated and added to the Range Lookup Table, with output ports automatically named. Note we have also selected the DAILY_TRAF attribute as our Source Attribute for categorization.

Lastly, we will overwrite the auto-generated Output Port names with meaningful names.

The features are output via the appropriate range’s Output Ports.

Features with attributes to be filtered.

Output ports are added for each defined range name. Features that match a range are output via the appropriate port.

If the feature’s attribute has a value that does not match any of the given ranges, or the attribute is not present, the feature is output via the <Unfiltered> port.

This table specifies a set a ranges and the port that a feature will be sent to if the Source Attribute value is within that range.

To automatically generate a set of ranges:

• Click the Generate button to start the generation wizard.
• Choose the minimum and maximum values of the attribute.
• Choose the number of ranges you would you want to generate. The ranges will be equally spaced between the specified minimum and maximum values.
• Select the Include Open-ended Ranges checkbox to create two additional ports for values that are smaller than the minimum value or larger than the maximum value.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters.

Using the Text Editor

The Text Editor provides a convenient way to construct text strings (including regular expressions) from various data sources, such as attributes, parameters, and constants, where the result is used directly inside a parameter.

Text Editor

Using the Arithmetic Editor

The Arithmetic Editor provides a convenient way to construct math expressions from various data sources, such as attributes, parameters, and feature functions, where the result is used directly inside a parameter.

Arithmetic Editor

Conditional Values

Set values depending on one or more test conditions that either pass or fail.

Parameter Condition Definition Dialog

Content

Expressions and strings can include a number of functions, characters, parameters, and more.

When setting values - whether entered directly in a parameter or constructed using one of the editors - strings and expressions containing String, Math, Date/Time or FME Feature Functions will have those functions evaluated. Therefore, the names of these functions (in the form @<function_name>) should not be used as literal string values.

Content Types

String Functions	These functions manipulate and format strings.
Special Characters	A set of control characters is available in the Text Editor.
Math Functions	Math functions are available in both editors.
Date/Time Functions	Date and time functions are available in the Text Editor.
Math Operators	These operators are available in the Arithmetic Editor.
FME Feature Functions	These return primarily feature-specific values.
FME Parameters	FME and workspace-specific parameters may be used.
Creating and Modifying User Parameters	Create your own editable parameters.

Table Tools

Transformers with table-style parameters have additional tools for populating and manipulating values.

Note: Not all tools are available in all transformers.