org.codehaus.groovy.ast.expr

## Class ConstantExpression

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

Direct Known Subclasses:
  AnnotationConstantExpression

    public class ConstantExpression
    extends Expression

Represents a constant expression such as null, true, false

Version:
  $Revision: 16444 $
Author:
  James Strachan

### Field Summary

Fields
`static ConstantExpression` `EMPTY_EXPRESSION`
`static ConstantExpression` `EMPTY_STRING`
`static ConstantExpression` `FALSE`
`static ConstantExpression` `NULL`
`static ConstantExpression` `TRUE`
`static ConstantExpression` `VOID`

### Constructor Summary

Constructors
Constructor and Description
`ConstantExpression(Object value)`

### Method Summary

Methods
`String` `getConstantName()`
`String` `getText()`
`Object` `getValue()`
`boolean` `isEmptyStringExpression()`
`boolean` `isFalseExpression()`
`boolean` `isNullExpression()`
`boolean` `isTrueExpression()`
`void` `setConstantName(String constantName)`
`String` `toString()`
`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, addAnnotations, getAnnotations, getAnnotations, getDeclaringClass, hasNoRealSourcePosition, isSynthetic, setDeclaringClass, setHasNoRealSourcePosition, setSynthetic`

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

`copyNodeMetaData, getColumnNumber, getLastColumnNumber, getLastLineNumber, getLineNumber, getNodeMetaData, removeNodeMetaData, setColumnNumber, setLastColumnNumber, setLastLineNumber, setLineNumber, setNodeMetaData, setSourcePosition`

### Methods inherited from class java.lang.Object

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

### Field Detail

#### NULL

    public static final ConstantExpression NULL

#### TRUE

    public static final ConstantExpression TRUE

#### FALSE

    public static final ConstantExpression FALSE

#### EMPTY_STRING

    public static final ConstantExpression EMPTY_STRING

#### VOID

    public static final ConstantExpression VOID

#### EMPTY_EXPRESSION

    public static final ConstantExpression EMPTY_EXPRESSION

### Constructor Detail

#### ConstantExpression

    public ConstantExpression(Object value)

### Method Detail

#### toString

    public String toString()

Overrides:
  `toString` in class `Object`

#### visit

    public void visit(GroovyCodeVisitor visitor)

Overrides:
  `visit` in class `ASTNode`

#### 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`

#### getValue

    public Object getValue()

Returns:
  the value of this constant expression

#### getText

    public String getText()

Overrides:
  `getText` in class `ASTNode`

#### getConstantName

    public String getConstantName()

#### setConstantName

    public void setConstantName(String constantName)

#### isNullExpression

    public boolean isNullExpression()

#### isTrueExpression

    public boolean isTrueExpression()

#### isFalseExpression

    public boolean isFalseExpression()

#### isEmptyStringExpression

    public boolean isEmptyStringExpression()