LazyFunction (PlantUML 1.2020.25 API)

All Known Subinterfaces:

Function

All Known Implementing Classes:

AbstractFunction, AbstractLazyFunction, Expression.Function, Expression.LazyFunction
```
public interface LazyFunction
```
Base interface which is required for lazily evaluated functions. A function is defined by a name, a number of parameters it accepts and of course the logic for evaluating the result.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`getName()`	Gets the name of this function. The name is use to invoke this function in the expression.
`int`	`getNumParams()`	Gets the number of parameters this function accepts. A value of `-1` denotes that this function accepts a variable number of parameters.
`boolean`	`isBooleanFunction()`	Gets whether this function evaluates to a boolean expression.
`Expression.LazyNumber`	`lazyEval(java.util.List<Expression.LazyNumber> lazyParams)`	Lazily evaluate this function.
`boolean`	`numParamsVaries()`	Gets whether the number of accepted parameters varies. That means that the function does accept an undefined amount of parameters.

- Method Detail
  - getName
```
java.lang.String getName()
```
    Gets the name of this function.
    
    The name is use to invoke this function in the expression.
    
    Returns:
    
    The name of this function.
  - getNumParams
```
int getNumParams()
```
    Gets the number of parameters this function accepts.
    
    A value of -1 denotes that this function accepts a variable number of parameters.
    
    Returns:
    
    The number of parameters this function accepts.
  - numParamsVaries
```
boolean numParamsVaries()
```
    Gets whether the number of accepted parameters varies.
    
    That means that the function does accept an undefined amount of parameters.
    
    Returns:
    
    true if the number of accepted parameters varies.
  - isBooleanFunction
```
boolean isBooleanFunction()
```
    Gets whether this function evaluates to a boolean expression.
    
    Returns:
    
    true if this function evaluates to a boolean expression.
  - lazyEval
```
Expression.LazyNumber lazyEval(java.util.List<Expression.LazyNumber> lazyParams)
```
    Lazily evaluate this function.
    
    Parameters:
    
    lazyParams - The accepted parameters.
    
    Returns:
    
    The lazy result of this function.