Package org.codehaus.groovy.ast.expr

Class ElvisOperatorExpression

  • All Implemented Interfaces:
    GroovydocHolder<AnnotatedNode>, NodeMetaDataHandler
    public class ElvisOperatorExpression
extends TernaryExpression
    Represents a short ternary expression x ?: y, which is equal to 
     def truePart = x
 def booleanPart = truePart as boolean
 booleanPart? truePart : y
    Even if x is no atomic expression, x will be evaluated only once. Example: 
     class Foo { 
   def index=0 
   def getX(){ index++; return index }
 }
 def foo = new Foo()
 def result = foo.x ?: "false case" 
 assert foo.index == 1
 assert result == 1
    Since:
    1.5