com.github.javaparser.ast.expr

Class LambdaExpr

java.lang.Object

com.github.javaparser.ast.Node

com.github.javaparser.ast.expr.Expression

com.github.javaparser.ast.expr.LambdaExpr

All Implemented Interfaces:

NodeWithParameters<LambdaExpr>, NodeWithRange<Node>, NodeWithTokenRange<Node>, Observable, Visitable, HasParentNode<Node>, Cloneable

public final class LambdaExpr
extends Expression
implements NodeWithParameters<LambdaExpr>

A lambda expression

Java 1-7

Does not exist.

Java 8+

(a, b) -> a + b
a -> ...
(Long a) -> { println(a); }

The parameters are on the left side of the ->. If a parameter uses type inference (it has no type specified) then its type is set to UnknownType. If they are in ( ), "isEnclosingParameters" is true.
The body is to the right of the ->. The body is either a BlockStatement when it is in { } braces, or an ExpressionStatement when it is not in braces.

Author:

Raquel Pau

Nested Class Summary

Nested classes/interfaces inherited from class com.github.javaparser.ast.Node

Node.BreadthFirstIterator, Node.DirectChildrenIterator, Node.ObserverRegistrationMode, Node.ParentsVisitor, Node.Parsedness, Node.PostOrderIterator, Node.PreOrderIterator, Node.TreeTraversal

Field Summary

Fields inherited from class com.github.javaparser.ast.Node

ABSOLUTE_BEGIN_LINE, ABSOLUTE_END_LINE, NODE_BY_BEGIN_POSITION, prettyPrinterNoCommentsConfiguration, SYMBOL_RESOLVER_KEY

Constructor Summary

Constructors

Constructor and Description
LambdaExpr()
LambdaExpr(NodeList<Parameter> parameters, Statement body, boolean isEnclosingParameters)
LambdaExpr(TokenRange tokenRange, NodeList<Parameter> parameters, Statement body, boolean isEnclosingParameters) This constructor is used by the parser and is considered private.

Method Summary

Modifier and Type	Method and Description
<R,A> R	accept(GenericVisitor<R,A> v, A arg) Accept method for visitor support.
<A> void	accept(VoidVisitor<A> v, A arg) Accept method for visitor support.
LambdaExpr	asLambdaExpr()
LambdaExpr	clone()
Statement	getBody()
Optional<Expression>	getExpressionBody()
LambdaExprMetaModel	getMetaModel()
NodeList<Parameter>	getParameters()
void	ifLambdaExpr(Consumer<LambdaExpr> action)
boolean	isEnclosingParameters()
boolean	isLambdaExpr()
boolean	remove(Node node)
boolean	replace(Node node, Node replacementNode)
LambdaExpr	setBody(Statement body)
LambdaExpr	setEnclosingParameters(boolean isEnclosingParameters)
LambdaExpr	setParameters(NodeList<Parameter> parameters)
Optional<LambdaExpr>	toLambdaExpr()

Methods inherited from class com.github.javaparser.ast.expr.Expression

asAnnotationExpr, asArrayAccessExpr, asArrayCreationExpr, asArrayInitializerExpr, asAssignExpr, asBinaryExpr, asBooleanLiteralExpr, asCastExpr, asCharLiteralExpr, asClassExpr, asConditionalExpr, asDoubleLiteralExpr, asEnclosedExpr, asFieldAccessExpr, asInstanceOfExpr, asIntegerLiteralExpr, asLiteralExpr, asLiteralStringValueExpr, asLongLiteralExpr, asMarkerAnnotationExpr, asMethodCallExpr, asMethodReferenceExpr, asNameExpr, asNormalAnnotationExpr, asNullLiteralExpr, asObjectCreationExpr, asSingleMemberAnnotationExpr, asStringLiteralExpr, asSuperExpr, asThisExpr, asTypeExpr, asUnaryExpr, asVariableDeclarationExpr, calculateResolvedType, ifAnnotationExpr, ifArrayAccessExpr, ifArrayCreationExpr, ifArrayInitializerExpr, ifAssignExpr, ifBinaryExpr, ifBooleanLiteralExpr, ifCastExpr, ifCharLiteralExpr, ifClassExpr, ifConditionalExpr, ifDoubleLiteralExpr, ifEnclosedExpr, ifFieldAccessExpr, ifInstanceOfExpr, ifIntegerLiteralExpr, ifLiteralExpr, ifLiteralStringValueExpr, ifLongLiteralExpr, ifMarkerAnnotationExpr, ifMethodCallExpr, ifMethodReferenceExpr, ifNameExpr, ifNormalAnnotationExpr, ifNullLiteralExpr, ifObjectCreationExpr, ifSingleMemberAnnotationExpr, ifStringLiteralExpr, ifSuperExpr, ifThisExpr, ifTypeExpr, ifUnaryExpr, ifVariableDeclarationExpr, isAnnotationExpr, isArrayAccessExpr, isArrayCreationExpr, isArrayInitializerExpr, isAssignExpr, isBinaryExpr, isBooleanLiteralExpr, isCastExpr, isCharLiteralExpr, isClassExpr, isConditionalExpr, isDoubleLiteralExpr, isEnclosedExpr, isFieldAccessExpr, isInstanceOfExpr, isIntegerLiteralExpr, isLiteralExpr, isLiteralStringValueExpr, isLongLiteralExpr, isMarkerAnnotationExpr, isMethodCallExpr, isMethodReferenceExpr, isNameExpr, isNormalAnnotationExpr, isNullLiteralExpr, isObjectCreationExpr, isSingleMemberAnnotationExpr, isStringLiteralExpr, isSuperExpr, isThisExpr, isTypeExpr, isUnaryExpr, isVariableDeclarationExpr, toAnnotationExpr, toArrayAccessExpr, toArrayCreationExpr, toArrayInitializerExpr, toAssignExpr, toBinaryExpr, toBooleanLiteralExpr, toCastExpr, toCharLiteralExpr, toClassExpr, toConditionalExpr, toDoubleLiteralExpr, toEnclosedExpr, toFieldAccessExpr, toInstanceOfExpr, toIntegerLiteralExpr, toLiteralExpr, toLiteralStringValueExpr, toLongLiteralExpr, toMarkerAnnotationExpr, toMethodCallExpr, toMethodReferenceExpr, toNameExpr, toNormalAnnotationExpr, toNullLiteralExpr, toObjectCreationExpr, toSingleMemberAnnotationExpr, toStringLiteralExpr, toSuperExpr, toThisExpr, toTypeExpr, toUnaryExpr, toVariableDeclarationExpr

Methods inherited from class com.github.javaparser.ast.Node

addOrphanComment, containsData, customInitialization, equals, findAll, findAll, findCompilationUnit, findFirst, findFirst, findFirst, findParent, findRootNode, getAllContainedComments, getChildNodes, getChildNodesByType, getComment, getData, getNodesByType, getOrphanComments, getParentNode, getParentNodeForChildren, getParsed, getRange, getSymbolResolver, getTokenRange, hasComment, hashCode, isRegistered, notifyPropertyChange, register, register, registerForSubtree, remove, removeComment, removeForced, removeOrphanComment, replace, setAsParentNodeOf, setAsParentNodeOf, setBlockComment, setComment, setData, setLineComment, setParentNode, setParsed, setRange, setTokenRange, stream, stream, toString, toString, tryAddImportToParentCompilationUnit, unregister, walk, walk, walk

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.github.javaparser.ast.nodeTypes.NodeWithParameters

addAndGetParameter, addAndGetParameter, addAndGetParameter, addAndGetParameter, addParameter, addParameter, addParameter, addParameter, getParameter, getParameterByName, getParameterByType, getParameterByType, hasParametersOfType, hasParametersOfType, setParameter, tryAddImportToParentCompilationUnit

Methods inherited from interface com.github.javaparser.HasParentNode

getAncestorOfType

Methods inherited from interface com.github.javaparser.ast.nodeTypes.NodeWithRange

containsWithin, getBegin, getEnd, isPositionedAfter, isPositionedBefore

Constructor Detail

LambdaExpr

public LambdaExpr()

LambdaExpr

public LambdaExpr(NodeList<Parameter> parameters,
                  Statement body,
                  boolean isEnclosingParameters)

LambdaExpr

@Generated(value="com.github.javaparser.generator.core.node.MainConstructorGenerator")
public LambdaExpr(TokenRange tokenRange,
                                                                                                         NodeList<Parameter> parameters,
                                                                                                         Statement body,
                                                                                                         boolean isEnclosingParameters)

This constructor is used by the parser and is considered private.

Method Detail

getParameters

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public NodeList<Parameter> getParameters()

Specified by:

getParameters in interface NodeWithParameters<LambdaExpr>

setParameters

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public LambdaExpr setParameters(NodeList<Parameter> parameters)

Specified by:

setParameters in interface NodeWithParameters<LambdaExpr>

getBody

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public Statement getBody()

Returns:

a BlockStatement or an ExpressionStatement. See class Javadoc.

setBody

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public LambdaExpr setBody(Statement body)

accept

@Generated(value="com.github.javaparser.generator.core.node.AcceptGenerator")
public <R,A> R accept(GenericVisitor<R,A> v,
                                                                                                    A arg)

Description copied from interface: Visitable

Accept method for visitor support.

Specified by:

accept in interface Visitable

Type Parameters:

R - the type of the return value of the visitor

A - the type the user argument passed to the visitor

Parameters:

v - the visitor implementation

arg - the argument passed to the visitor (of type A)

Returns:

the result of the visit (of type R)

accept

@Generated(value="com.github.javaparser.generator.core.node.AcceptGenerator")
public <A> void accept(VoidVisitor<A> v,
                                                                                                     A arg)

Description copied from interface: Visitable

Accept method for visitor support.

Specified by:

accept in interface Visitable

Type Parameters:

A - the type the argument passed for the visitor

Parameters:

v - the visitor implementation

arg - any value relevant for the visitor (of type A)

isEnclosingParameters

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public boolean isEnclosingParameters()

setEnclosingParameters

@Generated(value="com.github.javaparser.generator.core.node.PropertyGenerator")
public LambdaExpr setEnclosingParameters(boolean isEnclosingParameters)

remove

@Generated(value="com.github.javaparser.generator.core.node.RemoveMethodGenerator")
public boolean remove(Node node)

Overrides:

remove in class Expression

getExpressionBody

public Optional<Expression> getExpressionBody()

Returns:

if the body of this lambda is a simple expression, return that expression. Otherwise (when the body is a block) return Optional.empty().

clone

@Generated(value="com.github.javaparser.generator.core.node.CloneGenerator")
public LambdaExpr clone()

Overrides:

clone in class Expression

getMetaModel

@Generated(value="com.github.javaparser.generator.core.node.GetMetaModelGenerator")
public LambdaExprMetaModel getMetaModel()

Overrides:

getMetaModel in class Expression

Returns:

get JavaParser specific node introspection information.

replace

@Generated(value="com.github.javaparser.generator.core.node.ReplaceMethodGenerator")
public boolean replace(Node node,
                                                                                                            Node replacementNode)

Overrides:

replace in class Expression

isLambdaExpr

@Generated(value="com.github.javaparser.generator.core.node.TypeCastingGenerator")
public boolean isLambdaExpr()

Overrides:

isLambdaExpr in class Expression

asLambdaExpr

@Generated(value="com.github.javaparser.generator.core.node.TypeCastingGenerator")
public LambdaExpr asLambdaExpr()

Overrides:

asLambdaExpr in class Expression

ifLambdaExpr

@Generated(value="com.github.javaparser.generator.core.node.TypeCastingGenerator")
public void ifLambdaExpr(Consumer<LambdaExpr> action)

Overrides:

ifLambdaExpr in class Expression

toLambdaExpr

@Generated(value="com.github.javaparser.generator.core.node.TypeCastingGenerator")
public Optional<LambdaExpr> toLambdaExpr()

Overrides:

toLambdaExpr in class Expression