Class NullLit_c

  extended by polyglot.ext.jl.ast.Node_c
      extended by polyglot.ext.jl.ast.Term_c
          extended by polyglot.ext.jl.ast.Expr_c
              extended by polyglot.ext.jl.ast.Lit_c
                  extended by polyglot.ext.jl.ast.NullLit_c
All Implemented Interfaces:
java.lang.Cloneable, Expr, JL, Lit, Node, NodeOps, NullLit, Prefix, Receiver, Term, Typed, Copy

public class NullLit_c
extends Lit_c
implements NullLit

The Java literal null.

Field Summary
Fields inherited from class polyglot.ext.jl.ast.Expr_c
Fields inherited from class polyglot.ext.jl.ast.Term_c
exceptions, reachable
Fields inherited from class polyglot.ext.jl.ast.Node_c
del, ext, position
Constructor Summary
NullLit_c(Position pos)
Method Summary
 java.lang.Object constantValue()
          Returns the constant value of the expression, if any.
 java.lang.Object objValue()
          Get the value of the expression, as an object.
 void prettyPrint(CodeWriter w, PrettyPrinter tr)
          Write the expression to an output file.
 java.lang.String toString()
 Node typeCheck(TypeChecker tc)
          Type check the expression.
Methods inherited from class polyglot.ext.jl.ast.Lit_c
acceptCFG, entry, isConstant, precedence
Methods inherited from class polyglot.ext.jl.ast.Expr_c
booleanValue, buildTypes, byteValue, charValue, doubleValue, dump, floatValue, intValue, longValue, printSubExpr, printSubExpr, shortValue, stringValue, type, type
Methods inherited from class polyglot.ext.jl.ast.Term_c
exceptionCheck, exceptions, exceptions, listEntry, reachable, reachable
Methods inherited from class polyglot.ext.jl.ast.Node_c
addDecls, addMembers, addMembersEnter, addMembersOverride, buildTypesEnter, buildTypesOverride, childExpectedType, copy, del, del, disambiguate, disambiguateEnter, disambiguateOverride, enterScope, enterScope, exceptionCheckEnter, exceptionCheckOverride, ext, ext, ext, ext, init, node, position, position, print, printBlock, printSubStmt, throwTypes, translate, typeCheckEnter, typeCheckOverride, visit, visitChild, visitChildren, visitEdge, visitList
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
Methods inherited from interface polyglot.ast.Expr
isConstant, precedence, printSubExpr, printSubExpr, type
Methods inherited from interface polyglot.ast.Node
childExpectedType, del, del, dump, ext, ext, ext, ext, position, position, visit, visitChild, visitEdge, visitList
Methods inherited from interface polyglot.ast.JL
init, node
Methods inherited from interface polyglot.ast.NodeOps
addDecls, addMembers, addMembersEnter, buildTypes, buildTypesEnter, disambiguate, disambiguateEnter, enterScope, enterScope, exceptionCheck, exceptionCheckEnter, throwTypes, translate, typeCheckEnter, visitChildren
Methods inherited from interface polyglot.util.Copy
Methods inherited from interface polyglot.ast.Typed
Methods inherited from interface polyglot.ast.Term
acceptCFG, entry, exceptions, exceptions, reachable, reachable

Constructor Detail


public NullLit_c(Position pos)
Method Detail


public Node typeCheck(TypeChecker tc)
Type check the expression.

Specified by:
typeCheck in interface NodeOps
typeCheck in class Node_c
tc - The type checking visitor.


public java.lang.Object objValue()
Get the value of the expression, as an object.


public java.lang.String toString()
toString in class Node_c


public void prettyPrint(CodeWriter w,
                        PrettyPrinter tr)
Write the expression to an output file.

Specified by:
prettyPrint in interface NodeOps
prettyPrint in class Node_c
w - The code writer to which to write.
tr - The pretty printer. This is not a visitor.


public java.lang.Object constantValue()
Description copied from interface: Expr
Returns the constant value of the expression, if any.

Specified by:
constantValue in interface Expr
Specified by:
constantValue in class Lit_c