StringConcatenator

Input

This transformer accepts any feature.

Output

Features with the concatenated attributes.

Output Result

Expression Results

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.

New Attribute

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

Attributes To Overwrite

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().

String Parts

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.

Switch to Advanced

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.

How to Set Parameter Values

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.

Dialog Options - Tables

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.

StringConcatenator

Usage Notes

Configuration

Input Ports

Output Ports

Parameters

Editing Transformer Parameters

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