Package: org.codehaus.groovy.ast.expr

## [Java] Class ElvisOperatorExpression

- 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

- - Inherited fields
    Fields inherited from class | Fields
    --- | ---
    `class Expression` | `EMPTY_ARRAY`

  - ### Constructor Summary

    Constructors
    Constructor and description
    `ElvisOperatorExpression(Expression base, Expression falseExpression)`

  - ### Methods Summary

    Methods
    Type Params | Return Type | Name and description
    --- | --- | ---
    `` | `public Expression` | `transformExpression(ExpressionTransformer transformer)`
    `` | `public void` | `visit(GroovyCodeVisitor visitor)`

  - ### Inherited Methods Summary

    Inherited Methods
    Methods inherited from class | Name
    --- | ---
    `class TernaryExpression` | `getBooleanExpression, getFalseExpression, getText, getTrueExpression, getType, toString, transformExpression, visit`
    `class Expression` | `getType, setType, transformExpression, transformExpressions, transformExpressions`
    `class AnnotatedNode` | `addAnnotation, addAnnotations, getAnnotations, getAnnotations, getDeclaringClass, getGroovydoc, getInstance, hasNoRealSourcePosition, isSynthetic, setDeclaringClass, setHasNoRealSourcePosition, setSynthetic`
    `class ASTNode` | `copyNodeMetaData, getColumnNumber, getLastColumnNumber, getLastLineNumber, getLineNumber, getMetaDataMap, getText, setColumnNumber, setLastColumnNumber, setLastLineNumber, setLineNumber, setMetaDataMap, setSourcePosition, visit`

- - ### Constructor Detail

    - #### public ElvisOperatorExpression(Expression base, Expression falseExpression)

  - ### Method Detail

    - #### @Override public Expression transformExpression(ExpressionTransformer transformer)

    - #### @Override public void visit(GroovyCodeVisitor visitor)