io.parsingdata.metal.expression.value

Class Elvis

java.lang.Object

io.parsingdata.metal.expression.value.Elvis

All Implemented Interfaces:

ValueExpression

public class Elvis
extends Object
implements ValueExpression

A ValueExpression that implements the Elvis operator:

?:

.

An Elvis expression has two operands: left and right (both ValueExpressions). Both operands are evaluated. The return value is a list with the size of the longest list returned by the two evaluations. At each index, the value at that index in the result returned by evaluating left is placed, except if it does not exist or is OptionalValue.empty(), in which case the value at that index in the result returned by evaluating right is placed there.

Field Summary

Fields

Modifier and Type	Field and Description
ValueExpression	left
ValueExpression	right

Constructor Summary

Constructors

Constructor and Description
Elvis(ValueExpression left, ValueExpression right)

Method Summary

Modifier and Type	Method and Description
ImmutableList<OptionalValue>	eval(Environment environment, Encoding encoding)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

left

public final ValueExpression left

right

public final ValueExpression right

Constructor Detail

Elvis

public Elvis(ValueExpression left,
             ValueExpression right)

Method Detail

eval

public ImmutableList<OptionalValue> eval(Environment environment,
                                         Encoding encoding)

Specified by:

eval in interface ValueExpression

toString

public String toString()

Overrides:

toString in class Object