Package org.codehaus.groovy.ast.stmt

Class EmptyStatement

java.lang.Object

org.codehaus.groovy.ast.ASTNode

org.codehaus.groovy.ast.stmt.Statement

org.codehaus.groovy.ast.stmt.EmptyStatement

All Implemented Interfaces:

NodeMetaDataHandler

public class EmptyStatement
extends Statement

Represents an empty statement that performs no operation. An empty statement is a valid statement that can appear wherever a statement is expected but has no executable code. Empty statements are often used as default cases or as placeholders in control flow structures.

An immutable singleton INSTANCE is provided for use when source position or other occurrence-specific metadata is not needed. Using the singleton reduces memory overhead.

Field Summary

Fields

Modifier and Type	Field	Description
static final EmptyStatement	INSTANCE	Immutable singleton that is recommended for use when source range or any other occurrence-specific metadata is not needed.

Constructor Summary

Constructors

Constructor	Description
EmptyStatement()	Constructs a new empty statement instance.

Method Summary

Modifier and Type	Method	Description
boolean	isEmpty()	Returns true if this statement is empty or produces no side effects.
void	visit(GroovyCodeVisitor visitor)	Accepts a code visitor for AST traversal and transformation.

Methods inherited from class org.codehaus.groovy.ast.stmt.Statement

addStatementAnnotation, addStatementLabel, copyStatementLabels, getStatementAnnotations, getStatementLabel, getStatementLabels, setStatementLabel

Methods inherited from class org.codehaus.groovy.ast.ASTNode

copyNodeMetaData, getColumnNumber, getLastColumnNumber, getLastLineNumber, getLineNumber, getMetaDataMap, getText, setColumnNumber, setLastColumnNumber, setLastLineNumber, setLineNumber, setMetaDataMap, setSourcePosition

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.codehaus.groovy.ast.NodeMetaDataHandler

copyNodeMetaData, getNodeMetaData, getNodeMetaData, getNodeMetaData, newMetaDataMap, putNodeMetaData, removeNodeMetaData, setNodeMetaData

Field Details

INSTANCE

public static final EmptyStatement INSTANCE

Immutable singleton that is recommended for use when source range or any other occurrence-specific metadata is not needed. Using this singleton conserves memory by avoiding unnecessary object allocations.

See Also:

• EmptyStatement()

Constructor Details

EmptyStatement

public EmptyStatement()

Constructs a new empty statement instance. For most use cases, consider using INSTANCE instead to avoid unnecessary object allocation.

See Also:

• INSTANCE

Method Details

isEmpty

public boolean isEmpty()

Description copied from class: Statement

Returns true if this statement is empty or produces no side effects. Typically only EmptyStatement returns true.

Overrides:

isEmpty in class Statement

Returns:

true if this statement is empty

visit

public void visit(GroovyCodeVisitor visitor)

Description copied from class: ASTNode

Accepts a code visitor for AST traversal and transformation. Subclasses must implement this method to support visitor pattern-based processing. The visitor pattern enables decoupling of AST structure from processing logic.

Overrides:

visit in class ASTNode

Parameters:

visitor - the GroovyCodeVisitor to process this node