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
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 : 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
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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 Constructor Description ElvisOperatorExpression(Expression base, Expression falseExpression) -
Method Summary
Modifier and Type Method Description ExpressiontransformExpression(ExpressionTransformer transformer)Return a copy of the expression calling the transformer on any nested expressionsvoidvisit(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, 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, putNodeMetaData, removeNodeMetaData, setNodeMetaData
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Constructor Details
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ElvisOperatorExpression
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Method Details
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visit
- Overrides:
visitin classTernaryExpression
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transformExpression
Description copied from class:ExpressionReturn a copy of the expression calling the transformer on any nested expressions- Overrides:
transformExpressionin classTernaryExpression
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