Package li.selman.jpbe.dsl.expression

Class ConstantStringExpression

java.lang.Object

li.selman.jpbe.dsl.expression.ConstantStringExpression

All Implemented Interfaces:

DslElement, Expression

public class ConstantStringExpression
extends Object
implements Expression

Constructor Summary

Constructors

Constructor	Description
ConstantStringExpression(String constant)

Method Summary

Modifier and Type	Method	Description
Optional<String>	apply(String s)
boolean	equals(Object o)
int	getDslWeight()	The weight can be used to find an optimal program in a set of valid programs.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

ConstantStringExpression

public ConstantStringExpression(String constant)
                         throws IllegalArgumentException

Parameters:

constant - will always be returned regardless the input string

Throws:

IllegalArgumentException - if constant is null or empty

Method Details

apply

public Optional<String> apply(String s)

Specified by:

apply in interface Expression

getDslWeight

public int getDslWeight()

Description copied from interface: DslElement

The weight can be used to find an optimal program in a set of valid programs. "Optimal" is subjective and can go into different directions. Some examples include:

Weight by how expensive a DSL element is to execute.

Weight by how likely a DSL element is to be part of a generic full program. A ConstantPosition generally is less generic. Thus, the user has to specify their intent more often to finish their wrangling task.

Specified by:

getDslWeight in interface DslElement

Returns:

the weight of the DSL element

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object