The label Simple expression expects to hold a legal, Simple script and to be read and evaluated by a Simple expression interpreter. An example expression that combines text with a field value is
"State: " CONCAT [State_Name]
Note that quotes are needed around the literal text. See Labeling Objects for full documentation on the labelExpression syntax and functions.
Warning: If the expression attempts to use attributes which don't exist then no label will be produced. This is distinct from the attribute existing but having a null or empty value, which can form part of the produced text label.
SimpleLabelExpressionpublic SimpleLabelExpression()Creates a label Simple expression with an empty expression script.
An empty script is a legal Simple expression that will evaluate to an empty string.
(String simpleExpression)Creates a label Simple expression with a specific Simple script.
The expression is expected to be a complete, self-contained Simple expression.
simpleExpression- the Simple expression script string
IllegalArgumentException- if simpleExpression is null