StringConcatenator

This transformer accepts any feature.

Features with the concatenated attributes.

Choose Create New Attribute to evaluate the specified expression and have the calculated results put in the specified attribute.

Choose Overwrite Existing Attributes to evaluate the specified expression once per selected attribute. The result of the evaluation will be put back into the attribute.

This is the attribute that will contain the result. Use the default name, or type a new name.

This parameter allows the same expression to be evaluated, once per selected attribute. For each attribute specified, the result of the expression will be stored into that attribute.

If the concatenation needs the value of the current attribute, retrieve it using the function @CurrentAttribute(). For example, if the incoming feature has attributes X and Y, and we wish to prefix them with string prefix_, select both attributes, and set the expression to prefix_@CurrentAttribute().

Defines the items to be concatenated. For each item, you can select either an attribute value, constant, newline, published parameter, private parameter, or FME parameter. A preview of the resulting string is shown in the Concatenated Result window.

For example, you want to combine park name and area attributes into a single label that might look like this for a particular park:

Park: Strathcona Park

Area: 87308 sq ft

Under String Parts, select the attributes to concatenate, and constants and a New Line to complete the label:

To switch to a more advanced text editor, click the Switch to Advanced button.

In this editor, you can compose a string in the String Expression section. The string can contain attribute value references, function references, or user parameter references.

Note: To use Math functions in the text editor, you also need to use the feature function @Evaluate. For example, this expression multiplies the area of a feature by the value of an attribute, and creates a string that reports the result: @Evaluate(@Round(@Value(NumericAttribute))*@Area())

Note: You can switch back to basic mode using the Switch to Basic option on the Options menu; however, some table formatting may be lost when going from Advanced to Basic.

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.

Note: Not all tools are available in all transformers.