Class ElvisOperatorExpression

java.lang.Object
org.codehaus.groovy.ast.ASTNode
org.codehaus.groovy.ast.AnnotatedNode
org.codehaus.groovy.ast.expr.Expression
org.codehaus.groovy.ast.expr.TernaryExpression
org.codehaus.groovy.ast.expr.ElvisOperatorExpression
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


Author:


Jochen Theodorou