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## org.springframework.expression.spel.ast
Class Elvis

    java.lang.Object
      org.springframework.expression.spel.ast.SpelNodeImpl
          org.springframework.expression.spel.ast.Elvis

All Implemented Interfaces:
  SpelNode

    public class Elvis

extends SpelNodeImpl

Represents the elvis operator ?:. For an expression "a?:b" if a is not null, the value of the expression is "a", if a is null then the value of the expression is "b".

Since:
  3.0
Author:
  Andy Clement

Field Summary

Fields inherited from class org.springframework.expression.spel.ast.SpelNodeImpl
`children, pos`

Constructor Summary
`Elvis(int pos, SpelNodeImpl... args)`

Method Summary
`TypedValue` | `getValueInternal(ExpressionState state)` Evaluate the condition and if not null, return it.
`String` | `toStringAST()`

Methods inherited from class org.springframework.expression.spel.ast.SpelNodeImpl
`getChild, getChildCount, getEndPosition, getObjectClass, getPreviousChild, getStartPosition, getTypedValue, getValue, getValue, isWritable, nextChildIs, setValue`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### Elvis

    public Elvis(int pos,
                 SpelNodeImpl... args)

Method Detail

### getValueInternal

    public TypedValue getValueInternal(ExpressionState state)
                                throws EvaluationException

  Evaluate the condition and if not null, return it. If it is null return the other value.

  Specified by:
    `getValueInternal` in class `SpelNodeImpl`
  Parameters:
    `state` - the expression state
  Throws:
    `EvaluationException` - if the condition does not evaluate correctly to a boolean or there is a problem executing the chosen alternative

### toStringAST

    public String toStringAST()

  Specified by:
    `toStringAST` in interface `SpelNode`
  Specified by:
    `toStringAST` in class `SpelNodeImpl`
  Returns:
    the string form of this AST node

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