Package org.codehaus.groovy.ast.expr

# Class EmptyExpression

java.lang.Object
org.codehaus.groovy.ast.ASTNode
org.codehaus.groovy.ast.AnnotatedNode
org.codehaus.groovy.ast.expr.Expression
org.codehaus.groovy.ast.expr.EmptyExpression

All Implemented Interfaces:
  `GroovydocHolder<AnnotatedNode>`, `NodeMetaDataHandler`

public class EmptyExpression extends Expression
Placeholder for an empty expression. Empty expressions are used in closures lists like (;). During class generation empty expressions should be ignored or replaced with a null value.

See Also:
  - `EmptyStatement`

- ## Field Summary

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

  ### Fields inherited from class org.codehaus.groovy.ast.expr.Expression

  `EMPTY_ARRAY`

  ### Fields inherited from interface groovy.lang.groovydoc.GroovydocHolder

  `DOC_COMMENT`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `EmptyExpression()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Expression`
  `transformExpression(ExpressionTransformer transformer)`
  Return a copy of the expression calling the transformer on any nested expressions
  `void`
  `visit(GroovyCodeVisitor visitor)`

  ### Methods inherited from class org.codehaus.groovy.ast.expr.Expression

  `getType, setType, transformExpressions, transformExpressions`

  ### Methods inherited from class org.codehaus.groovy.ast.AnnotatedNode

  `addAnnotation, addAnnotation, addAnnotations, getAnnotations, getAnnotations, getDeclaringClass, getGroovydoc, getInstance, hasNoRealSourcePosition, isSynthetic, setDeclaringClass, setHasNoRealSourcePosition, setSynthetic`

  ### 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, putNodeMetaData, removeNodeMetaData, setNodeMetaData`

- ## Field Details

  - ### INSTANCE

    public static final EmptyExpression INSTANCE
    Immutable singleton that is recommended for use when source range or any other occurrence-specific metadata is not needed.

- ## Constructor Details

  - ### EmptyExpression

    public EmptyExpression()
    See Also:
      - `INSTANCE`

- ## Method Details

  - ### transformExpression

    public Expression transformExpression(ExpressionTransformer transformer)
    Description copied from class: `Expression`
    Return a copy of the expression calling the transformer on any nested expressions
    Specified by:
      `transformExpression` in class `Expression`

  - ### visit

    public void visit(GroovyCodeVisitor visitor)
    Overrides:
      `visit` in class `ASTNode`