Package 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 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 BlockStmt when it is in { } braces, or an ExpressionStmt 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.expr.Expression

EXCLUDE_ENCLOSED_EXPR, IS_NOT_ENCLOSED_EXPR

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

ABSOLUTE_BEGIN_LINE, ABSOLUTE_END_LINE, LINE_SEPARATOR_KEY, NODE_BY_BEGIN_POSITION, PHANTOM_KEY, prettyPrinterNoCommentsConfiguration, PRINTER_KEY, SYMBOL_RESOLVER_KEY

Constructor Summary

Constructors

Constructor	Description
LambdaExpr()
LambdaExpr(Parameter parameter, Expression body)	Creates a single parameter lambda expression.
LambdaExpr(Parameter parameter, BlockStmt body)	Creates a single parameter lambda expression.
LambdaExpr(NodeList<Parameter> parameters, Expression body)	Creates a zero or multi-parameter lambda expression with its parameters wrapped in ( ).
LambdaExpr(NodeList<Parameter> parameters, BlockStmt body)	Creates a zero or multi-parameter lambda expression with its parameters wrapped in ( ).
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	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	isExplicitlyTyped()
boolean	isLambdaExpr()
boolean	isPolyExpression()	See https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.2
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

appearsInAssignmentContext, appearsInInvocationContext, 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, asPatternExpr, asRecordPatternExpr, asSingleMemberAnnotationExpr, asStringLiteralExpr, asSuperExpr, asSwitchExpr, asTextBlockLiteralExpr, asThisExpr, asTypeExpr, asTypePatternExpr, asUnaryExpr, asVariableDeclarationExpr, calculateResolvedType, elidesTypeArguments, 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, ifPatternExpr, ifRecordPatternExpr, ifSingleMemberAnnotationExpr, ifStringLiteralExpr, ifSuperExpr, ifSwitchExpr, ifTextBlockLiteralExpr, ifThisExpr, ifTypeExpr, ifTypePatternExpr, ifUnaryExpr, ifVariableDeclarationExpr, isAnnotationExpr, isArrayAccessExpr, isArrayCreationExpr, isArrayInitializerExpr, isAssignExpr, isAssignmentContext, isBinaryExpr, isBooleanLiteralExpr, isCastExpr, isCharLiteralExpr, isClassExpr, isConditionalExpr, isDoubleLiteralExpr, isEnclosedExpr, isFieldAccessExpr, isInstanceOfExpr, isIntegerLiteralExpr, isInvocationContext, isLiteralExpr, isLiteralStringValueExpr, isLongLiteralExpr, isMarkerAnnotationExpr, isMethodCallExpr, isMethodReferenceExpr, isNameExpr, isNormalAnnotationExpr, isNullLiteralExpr, isObjectCreationExpr, isPatternExpr, isQualified, isRecordPatternExpr, isSingleMemberAnnotationExpr, isStandaloneExpression, isStringLiteralExpr, isSuperExpr, isSwitchExpr, isTextBlockLiteralExpr, isThisExpr, isTypeExpr, isTypePatternExpr, 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, toPatternExpr, toRecordPatternExpr, toSingleMemberAnnotationExpr, toStringLiteralExpr, toSuperExpr, toSwitchExpr, toTextBlockLiteralExpr, toThisExpr, toTypeExpr, toTypePatternExpr, toUnaryExpr, toVariableDeclarationExpr

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

addOrphanComment, containsData, createDefaultPrinter, createDefaultPrinter, customInitialization, equals, findAll, findAll, findAll, findByRange, findCompilationUnit, findData, findFirst, findFirst, findFirst, findRootNode, getAllContainedComments, getChildNodes, getChildNodesByType, getComment, getData, getDataKeys, getDefaultPrinterConfiguration, getLineEndingStyle, getLineEndingStyleOrDefault, getNodesByType, getOrphanComments, getParentNode, getParentNodeForChildren, getParsed, getPrinter, getPrinter, getRange, getSymbolResolver, getTokenRange, hashCode, hasScope, isAncestorOf, isPhantom, isRegistered, notifyPropertyChange, register, register, registerForSubtree, remove, removeComment, removeData, 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.HasParentNode

findAncestor, findAncestor, findAncestor, hasParentNode, isDescendantOf

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.ast.nodeTypes.NodeWithRange

containsWithin, containsWithinRange, getBegin, getEnd, hasRange

Constructor Detail

LambdaExpr

public LambdaExpr()

LambdaExpr

public LambdaExpr(Parameter parameter,
                  BlockStmt body)

Creates a single parameter lambda expression.

LambdaExpr

public LambdaExpr(NodeList<Parameter> parameters,
                  BlockStmt body)

Creates a zero or multi-parameter lambda expression with its parameters wrapped in ( ).

LambdaExpr

public LambdaExpr(Parameter parameter,
                  Expression body)

Creates a single parameter lambda expression.

LambdaExpr

public LambdaExpr(NodeList<Parameter> parameters,
                  Expression body)

Creates a zero or multi-parameter lambda expression with its parameters wrapped in ( ).

LambdaExpr

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

LambdaExpr

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

public NodeList<Parameter> getParameters()

Specified by:

getParameters in interface NodeWithParameters<LambdaExpr>

setParameters

public LambdaExpr setParameters(NodeList<Parameter> parameters)

Specified by:

setParameters in interface NodeWithParameters<LambdaExpr>

getBody

public Statement getBody()

Returns:

a BlockStatement or an ExpressionStatement. See class Javadoc.

setBody

public LambdaExpr setBody(Statement body)

accept

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

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

public boolean isEnclosingParameters()

setEnclosingParameters

public LambdaExpr setEnclosingParameters(boolean isEnclosingParameters)

remove

public boolean remove(Node node)

Overrides:

remove in class Node

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

public LambdaExpr clone()

Overrides:

clone in class Expression

getMetaModel

public LambdaExprMetaModel getMetaModel()

Overrides:

getMetaModel in class Expression

Returns:

get JavaParser specific node introspection information.

replace

public boolean replace(Node node,
                       Node replacementNode)

Overrides:

replace in class Node

isLambdaExpr

public boolean isLambdaExpr()

Overrides:

isLambdaExpr in class Expression

asLambdaExpr

public LambdaExpr asLambdaExpr()

Overrides:

asLambdaExpr in class Expression

ifLambdaExpr

public void ifLambdaExpr(Consumer<LambdaExpr> action)

Overrides:

ifLambdaExpr in class Expression

toLambdaExpr

public Optional<LambdaExpr> toLambdaExpr()

Overrides:

toLambdaExpr in class Expression

isPolyExpression

public boolean isPolyExpression()

Description copied from class: Expression

See https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html#jls-15.2

Overrides:

isPolyExpression in class Expression

Returns:

true if the expression is a poly expression

isExplicitlyTyped

public boolean isExplicitlyTyped()