Package org.aspectj.org.eclipse.jdt.core.dom

Class LambdaExpression

java.lang.Object

org.aspectj.org.eclipse.jdt.core.dom.ASTNode

org.aspectj.org.eclipse.jdt.core.dom.Expression

org.aspectj.org.eclipse.jdt.core.dom.LambdaExpression

public class LambdaExpression
extends Expression

Lambda expression AST node type (added in JLS8 API).

 LambdaExpression:
    Identifier -> Body
    ( [ Identifier { , Identifier } ] ) -> Body
    ( [ FormalParameter { , FormalParameter } ] ) -> Body
 

The first two forms use VariableDeclarationFragment for the parameter or parameters, while the third form uses SingleVariableDeclaration.

The Body can be either a Block or an Expression.

Since:

3.10

Field Summary

Fields

Modifier and Type	Field	Description
static final ChildPropertyDescriptor	BODY_PROPERTY	The "body" structural property of this node type (child type: ASTNode, must be either a Block or an Expression).
static final ChildListPropertyDescriptor	PARAMETERS_PROPERTY	The "parameters" structural property of this node type (element type: VariableDeclaration).
static final SimplePropertyDescriptor	PARENTHESES_PROPERTY	The "parentheses" structural property of this node type (type: Boolean).

Fields inherited from class org.aspectj.org.eclipse.jdt.core.dom.ASTNode

ANNOTATION_TYPE_DECLARATION, ANNOTATION_TYPE_MEMBER_DECLARATION, ANONYMOUS_CLASS_DECLARATION, ARRAY_ACCESS, ARRAY_CREATION, ARRAY_INITIALIZER, ARRAY_TYPE, ASSERT_STATEMENT, ASSIGNMENT, BLOCK, BLOCK_COMMENT, BOOLEAN_LITERAL, BREAK_STATEMENT, CASE_DEFAULT_EXPRESSION, CAST_EXPRESSION, CATCH_CLAUSE, CHARACTER_LITERAL, CLASS_INSTANCE_CREATION, COMPILATION_UNIT, CONDITIONAL_EXPRESSION, CONSTRUCTOR_INVOCATION, CONTINUE_STATEMENT, CREATION_REFERENCE, DIMENSION, DO_STATEMENT, EitherOr_MultiPattern, EMPTY_STATEMENT, ENHANCED_FOR_STATEMENT, ENHANCED_FOR_WITH_RECORD_PATTERN, ENUM_CONSTANT_DECLARATION, ENUM_DECLARATION, EXPORTS_DIRECTIVE, EXPRESSION_METHOD_REFERENCE, EXPRESSION_STATEMENT, FIELD_ACCESS, FIELD_DECLARATION, FOR_STATEMENT, GUARDED_PATTERN, IF_STATEMENT, IMPORT_DECLARATION, INFIX_EXPRESSION, INITIALIZER, INSTANCEOF_EXPRESSION, INTERSECTION_TYPE, JAVADOC, JAVADOC_REGION, JAVADOC_TEXT_ELEMENT, LABELED_STATEMENT, LAMBDA_EXPRESSION, LINE_COMMENT, MALFORMED, MARKER_ANNOTATION, MEMBER_REF, MEMBER_VALUE_PAIR, METHOD_DECLARATION, METHOD_INVOCATION, METHOD_REF, METHOD_REF_PARAMETER, MODIFIER, MODULE_DECLARATION, MODULE_MODIFIER, MODULE_QUALIFIED_NAME, NAME_QUALIFIED_TYPE, NORMAL_ANNOTATION, NULL_LITERAL, NULL_PATTERN, NUMBER_LITERAL, OPENS_DIRECTIVE, ORIGINAL, PACKAGE_DECLARATION, PARAMETERIZED_TYPE, PARENTHESIZED_EXPRESSION, PATTERN_INSTANCEOF_EXPRESSION, POSTFIX_EXPRESSION, PREFIX_EXPRESSION, PRIMITIVE_TYPE, PROTECT, PROVIDES_DIRECTIVE, QUALIFIED_NAME, QUALIFIED_TYPE, RECORD_DECLARATION, RECORD_PATTERN, RECOVERED, REQUIRES_DIRECTIVE, RETURN_STATEMENT, SIMPLE_NAME, SIMPLE_TYPE, SINGLE_MEMBER_ANNOTATION, SINGLE_VARIABLE_DECLARATION, STRING_FRAGMENT, STRING_LITERAL, STRING_TEMPLATE_COMPONENT, STRING_TEMPLATE_EXPRESSION, SUPER_CONSTRUCTOR_INVOCATION, SUPER_FIELD_ACCESS, SUPER_METHOD_INVOCATION, SUPER_METHOD_REFERENCE, SWITCH_CASE, SWITCH_EXPRESSION, SWITCH_STATEMENT, SYNCHRONIZED_STATEMENT, TAG_ELEMENT, TAG_PROPERTY, TEXT_BLOCK, TEXT_ELEMENT, THIS_EXPRESSION, THROW_STATEMENT, TRY_STATEMENT, TYPE_DECLARATION, TYPE_DECLARATION_STATEMENT, TYPE_LITERAL, TYPE_METHOD_REFERENCE, TYPE_PARAMETER, TYPE_PATTERN, UNION_TYPE, UNNAMED_CLASS, USES_DIRECTIVE, VARIABLE_DECLARATION_EXPRESSION, VARIABLE_DECLARATION_FRAGMENT, VARIABLE_DECLARATION_STATEMENT, WHILE_STATEMENT, WILDCARD_TYPE, YIELD_STATEMENT

Method Summary

Modifier and Type	Method	Description
ASTNode	getBody()	Returns the body of this lambda expression.
boolean	hasParentheses()	Returns whether parentheses around the parameters are present or not.
List	parameters()	Returns the live ordered list of formal parameters of this lambda expression.
static List	propertyDescriptors(int apiLevel)	Returns a list of structural property descriptors for this node type.
IMethodBinding	resolveMethodBinding()	Resolves and returns the binding for the lambda expression
void	setBody(ASTNode body)	Sets the body of this lambda expression.
void	setParentheses(boolean hasParentheses)	Sets whether this lambda expression has parentheses around its parameters or not.

Methods inherited from class org.aspectj.org.eclipse.jdt.core.dom.Expression

resolveBoxing, resolveConstantExpressionValue, resolveTypeBinding, resolveUnboxing

Methods inherited from class org.aspectj.org.eclipse.jdt.core.dom.ASTNode

accept, copySubtree, copySubtrees, delete, equals, getAST, getFlags, getLength, getLocationInParent, getNodeType, getParent, getProperty, getRoot, getStartPosition, getStructuralProperty, hashCode, nodeClassForType, properties, setFlags, setProperty, setSourceRange, setStructuralProperty, structuralPropertiesForType, subtreeBytes, subtreeMatch, toString

Methods inherited from class java.lang.Object

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

Field Details

PARENTHESES_PROPERTY

public static final SimplePropertyDescriptor PARENTHESES_PROPERTY

The "parentheses" structural property of this node type (type: Boolean).

Note that parentheses are required unless parameters() contains just a single VariableDeclarationFragment. ASTRewrite may ignore this property if necessary.

PARAMETERS_PROPERTY

public static final ChildListPropertyDescriptor PARAMETERS_PROPERTY

The "parameters" structural property of this node type (element type: VariableDeclaration).

Note that all elements must be of the same type, either all SingleVariableDeclaration or all VariableDeclarationFragment.

BODY_PROPERTY

public static final ChildPropertyDescriptor BODY_PROPERTY

The "body" structural property of this node type (child type: ASTNode, must be either a Block or an Expression).

Method Details

propertyDescriptors

public static List propertyDescriptors(int apiLevel)

Returns a list of structural property descriptors for this node type. Clients must not modify the result.

Parameters:

apiLevel - the API level; one of the AST.JLS* constants

Returns:

a list of property descriptors (element type: StructuralPropertyDescriptor)

hasParentheses

public boolean hasParentheses()

Returns whether parentheses around the parameters are present or not.

Note that parentheses are required unless parameters() contains just a single VariableDeclarationFragment. ASTRewrite may ignore this property if necessary.

Returns:

true if this lambda expression has parentheses around its parameters and false otherwise

setParentheses

public void setParentheses(boolean hasParentheses)

Sets whether this lambda expression has parentheses around its parameters or not.

Note that parentheses are required unless parameters() contains just a single VariableDeclarationFragment. ASTRewrite may ignore this property if necessary.

Parameters:

hasParentheses - true if this lambda expression has parentheses around its parameters and false otherwise

parameters

public List parameters()

Returns the live ordered list of formal parameters of this lambda expression. Note that all elements must be of the same type, either

• all SingleVariableDeclaration (explicit type), or
• all VariableDeclarationFragment (inferred type).

Returns:

the live list of formal parameters of this lambda expression (element type: VariableDeclaration)

getBody

public ASTNode getBody()

Returns the body of this lambda expression.

Returns:

the lambda expression body, which can be either a Block or an Expression

setBody

public void setBody(ASTNode body)

Sets the body of this lambda expression.

Parameters:

body - a block node or an expression node

Throws:

IllegalArgumentException - if:

• the node belongs to a different AST
• the node already has a parent
• a cycle in would be created
• body is neither a Block nor an Expression

resolveMethodBinding

public IMethodBinding resolveMethodBinding()

Resolves and returns the binding for the lambda expression

Note that bindings are generally unavailable unless requested when the AST is being built.

Returns:

the binding, or null if the binding cannot be resolved