Package org.codehaus.groovy.ast.expr
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
- All Implemented Interfaces:
GroovydocHolder<AnnotatedNode>,NodeMetaDataHandler
Represents a short ternary expression x ?: y, which is equal to
def truePart = x def booleanPart = truePart as boolean booleanPart? truePart : yEven 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
-
Field Summary
Fields inherited from class org.codehaus.groovy.ast.expr.Expression
EMPTY_ARRAYFields inherited from interface groovy.lang.groovydoc.GroovydocHolder
DOC_COMMENT -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptiontransformExpression(ExpressionTransformer transformer) Transforms this expression and any nested expressions.voidvisit(GroovyCodeVisitor visitor) Methods inherited from class org.codehaus.groovy.ast.expr.TernaryExpression
getBooleanExpression, getFalseExpression, getText, getTrueExpression, getType, toStringMethods inherited from class org.codehaus.groovy.ast.expr.Expression
setType, transformExpressions, transformExpressionsMethods inherited from class org.codehaus.groovy.ast.AnnotatedNode
addAnnotation, addAnnotation, addAnnotations, getAnnotations, getAnnotations, getDeclaringClass, getGroovydoc, getInstance, hasNoRealSourcePosition, isSynthetic, setDeclaringClass, setHasNoRealSourcePosition, setSyntheticMethods inherited from class org.codehaus.groovy.ast.ASTNode
copyNodeMetaData, getColumnNumber, getLastColumnNumber, getLastLineNumber, getLineNumber, getMetaDataMap, setColumnNumber, setLastColumnNumber, setLastLineNumber, setLineNumber, setMetaDataMap, setSourcePositionMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface org.codehaus.groovy.ast.NodeMetaDataHandler
copyNodeMetaData, getNodeMetaData, getNodeMetaData, getNodeMetaData, newMetaDataMap, putNodeMetaData, removeNodeMetaData, setNodeMetaData
-
Constructor Details
-
ElvisOperatorExpression
-
-
Method Details
-
transformExpression
Description copied from class:ExpressionTransforms this expression and any nested expressions.- Overrides:
transformExpressionin classTernaryExpression
-
visit
- Overrides:
visitin classTernaryExpression
-