Expression (JOSM)

All Known Implementing Classes:

ExpressionFactory.AndOperator, ExpressionFactory.CondOperator, ExpressionFactory.IsInsideFunction, ExpressionFactory.LengthFunction, ExpressionFactory.MinMaxFunction, ExpressionFactory.NullExpression, ExpressionFactory.OrOperator, LiteralExpression, PlaceholderExpression

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface Expression
```
A MapCSS Expression. Can be evaluated in a certain Environment. Usually takes parameters, that are also Expressions and have to be evaluated first.

Since:

3848 (creation), 10600 (functional interface)

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  java.lang.Object evaluate(Environment env)
  Evaluate this expression.

- Method Detail
  - evaluate
```
java.lang.Object evaluate(Environment env)
```
    Evaluate this expression.
    
    Parameters:
    
    env - The environment
    
    Returns:
    
    the result of the evaluation, can be a List, String or any primitive type or wrapper classes of a primitive type.