FME Transformers: 2024.2

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FMEFunctionCaller

Calls a specified FME function, optionally storing the resulting value in an attribute.

Jump to Configuration

Typical Uses

  • In rare cases, calling a specific FME function.

How does it work?

The FMEFunctionCaller may be inserted anywhere in a workspace, and runs individual FME functions. It is a legacy transformer that exists for backward compatibility, and should rarely (if ever) be used.

It may not support newer FME functions. Functions that are not supported will produce an error message indicating that the function is not recognized.

Information about FME functions may be found in the FME Factories and Functions documentation page - as noted above, not all functions will be supported in this transformer.

You may provide an attribute name to store the result in, and specify a configuration line for those functions that require one.

Examples

The @Reformat function requires a configuration line. To employ it within a workspace, the function would be called like this:

The configuration line which defines the "BinaryKey" binary structure is specified in the Configuration Line parameter.

Configuration

Input Ports

This transformer accepts any input features.

Output Ports

Features with the results of any functions called applied.

Parameters

FME Function

Specifies the FME function (@FunctionName) to be called, as well as any parameters it can take.

Configuration Line

Optional: Can be specified if the underlying FME function requires it.

Result Attribute

(Optional) Name the attribute to contain the value returned by the FME function.

Editing Transformer Parameters

Transformer parameters can be set by directly entering values, using expressions, or referencing other elements in the workspace such as attribute values or user parameters. Various editors and context menus are available to assist. To see what is available, click beside the applicable parameter.

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.

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.

Row Reordering

Enabled once you have clicked on a row item. Choices include:

  • Add a row
  • Remove a row
  • Move current row up one
  • Move current row down one
  • Move current row to top
  • Move current row to bottom

Cut, Copy, and Paste

Enabled once you have clicked on a row item. Choices include:

  • Cut a row - delete and copy to clipboard
  • Copy a row to the clipboard
  • Paste a row from the clipboard

Cut, copy, and paste may be used within a transformer, or between transformers.

Filter

Start typing a string, and the matrix will only display rows matching those characters. Searches all columns. This only affects the display of attributes within the transformer - it does not alter which attributes are output.

Import

Import populates the table with a set of new attributes read from a dataset. Specific application varies between transformers.

Reset/Refresh

Generally resets the table to its initial state, and may provide additional options to remove invalid entries. Behavior varies between transformers.

Note: Not all tools are available in all transformers.

For more information, see Transformer Parameter Menu Options.

Reference

Processing Behavior

Feature-Based

Feature Holding

No
Dependencies None
Aliases  
History  

FME Community

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Search for all results about the FMEFunctionCaller on the FME Community.

 

Examples may contain information licensed under the Open Government Licence – Vancouver, Open Government Licence - British Columbia, and/or Open Government Licence – Canada.