io.parsingdata.metal.expression.value.reference

Class Nth

java.lang.Object

io.parsingdata.metal.expression.value.reference.Nth

All Implemented Interfaces:

ValueExpression

public class Nth
extends Object
implements ValueExpression

A ValueExpression that returns an indexed list of Values.

The Nth ValueExpression has two operands, values and indices (both ValueExpressions). Both operands are evaluated. Next, the resulting values of evaluating indices is used as a list of integer indices into the results of evaluating values. For every invalid index (such as Optional.empty(), a negative value or an index that is out of bounds) empty is returned.

Field Summary

Fields

Modifier and Type	Field and Description
ValueExpression	indices
ValueExpression	values

Constructor Summary

Constructors

Constructor and Description
Nth(ValueExpression values, ValueExpression indices)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
ImmutableList<Optional<Value>>	eval(ParseState parseState, Encoding encoding)
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

values

public final ValueExpression values

indices

public final ValueExpression indices

Constructor Detail

Nth

public Nth(ValueExpression values,
           ValueExpression indices)

Method Detail

eval

public ImmutableList<Optional<Value>> eval(ParseState parseState,
                                           Encoding encoding)

Specified by:

eval in interface ValueExpression

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object