polyglot.ast
Class Case_c

java.lang.Object
  polyglot.ast.Node_c
      polyglot.ast.Term_c
          polyglot.ast.Stmt_c
              polyglot.ast.Case_c

All Implemented Interfaces:

java.lang.Cloneable, Case, JL, Node, NodeOps, Stmt, SwitchElement, Term, Copy

public class Case_c
extends Stmt_c
implements Case

A Case is a representation of a Java case statement. It can only be contained in a Switch.

Field Summary

protected Expr	expr
protected long	value

Fields inherited from class polyglot.ast.Term_c

exceptions, reachable

Fields inherited from class polyglot.ast.Node_c

del, error, ext, position

Fields inherited from interface polyglot.ast.Term

ENTRY, EXIT

Constructor Summary

Case_c(Position pos, Expr expr)

Method Summary

java.util.List	acceptCFG(CFGBuilder v, java.util.List succs) Visit this term in evaluation order.
Node	checkConstants(ConstantChecker cc) Check if the node is a compile-time constant.
Type	childExpectedType(Expr child, AscriptionVisitor av) Get the expected type of a child expression of this.
Node	copy(NodeFactory nf) Produce a copy of this node using the given NodeFactory.
Expr	expr() Get the case label.
Case	expr(Expr expr) Set the case label.
Term	firstChild() Return the first direct subterm performed when evaluating this term.
boolean	isDefault() Returns true iff this is the default case.
void	prettyPrint(CodeWriter w, PrettyPrinter tr) Write the statement to an output file.
protected Case_c	reconstruct(Expr expr) Reconstruct the statement.
java.lang.String	toString()
Node	typeCheck(TypeChecker tc) Type check the statement.
long	value() Returns the value of the case label.
Case	value(long value) Set the value of the case label.
Node	visitChildren(NodeVisitor v) Visit the children of the statement.

Methods inherited from class polyglot.ast.Term_c

exceptionCheck, exceptions, exceptions, listChild, reachable, reachable

Methods inherited from class polyglot.ast.Node_c

addDecls, buildTypes, buildTypesEnter, copy, copy, del, del, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, dump, enterChildScope, enterScope, error, error, exceptionCheckEnter, ext, ext, ext, ext, init, isDisambiguated, isTypeChecked, node, position, position, prettyPrint, prettyPrint, print, printBlock, printSubStmt, throwTypes, translate, typeCheckEnter, typeCheckOverride, visit, visitChild, 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.Term

exceptions, exceptions, reachable, reachable

Methods inherited from interface polyglot.ast.Node

del, del, dump, error, error, ext, ext, ext, ext, isDisambiguated, isTypeChecked, position, position, visit, visitChild, visitEdge, visitList

Methods inherited from interface polyglot.ast.JL

init, node

Methods inherited from interface polyglot.ast.NodeOps

addDecls, buildTypes, buildTypesEnter, copy, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, enterChildScope, enterScope, exceptionCheck, exceptionCheckEnter, prettyPrint, prettyPrint, throwTypes, translate, typeCheckEnter, typeCheckOverride

Methods inherited from interface polyglot.util.Copy

copy

Field Detail

expr

protected Expr expr

value

protected long value

Constructor Detail

Case_c

public Case_c(Position pos,
              Expr expr)

Method Detail

isDefault

public boolean isDefault()

Returns true iff this is the default case.

Specified by:

isDefault in interface Case

expr

public Expr expr()

Get the case label. This must should a constant expression. The case label is null for the default case.

Specified by:

expr in interface Case

expr

public Case expr(Expr expr)

Set the case label. This must should a constant expression, or null.

Specified by:

expr in interface Case

value

public long value()

Returns the value of the case label. This value is only valid after type-checking.

Specified by:

value in interface Case

value

public Case value(long value)

Set the value of the case label.

Specified by:

value in interface Case

reconstruct

protected Case_c reconstruct(Expr expr)

Reconstruct the statement.

visitChildren

public Node visitChildren(NodeVisitor v)

Visit the children of the statement.

Specified by:

visitChildren in interface NodeOps

Overrides:

visitChildren in class Node_c

Parameters:

v - The visitor that will traverse/rewrite the AST.

Returns:

A new AST if a change was made, or this.

typeCheck

public Node typeCheck(TypeChecker tc)
               throws SemanticException

Type check the statement.

Specified by:

typeCheck in interface NodeOps

Overrides:

typeCheck in class Node_c

Parameters:

tc - The type checking visitor.

Throws:

SemanticException

checkConstants

public Node checkConstants(ConstantChecker cc)
                    throws SemanticException

Description copied from interface: NodeOps

Check if the node is a compile-time constant. This method is called by the leave() method of the visitor. The method should perform work that should be done after visiting the children of the node. The method may return this or a new copy of the node which will be installed as a child of the node's parent.

Specified by:

checkConstants in interface NodeOps

Overrides:

checkConstants in class Node_c

Parameters:

cc - The constant checking visitor.

Throws:

SemanticException

childExpectedType

public Type childExpectedType(Expr child,
                              AscriptionVisitor av)

Description copied from interface: Node

Get the expected type of a child expression of this. The expected type is determined by the context in that the child occurs (e.g., for x = e, the expected type of e is the declared type of x. The expected type should impose the least constraints on the child's type that are allowed by the parent node.

Specified by:

childExpectedType in interface Node

Overrides:

childExpectedType in class Node_c

Parameters:

child - A child expression of this node.

av - An ascription visitor.

Returns:

The expected type of child.

toString

public java.lang.String toString()

Overrides:

toString in class Node_c

prettyPrint

public void prettyPrint(CodeWriter w,
                        PrettyPrinter tr)

Write the statement to an output file.

Specified by:

prettyPrint in interface NodeOps

Overrides:

prettyPrint in class Node_c

Parameters:

w - The code writer to which to write.

tr - The pretty printer. This is not a visitor.

firstChild

public Term firstChild()

Description copied from interface: Term

Return the first direct subterm performed when evaluating this term. If this term has no subterms, this should return null. This method is similar to the deprecated entry(), but it should *not* recursively drill down to the innermost subterm. The direct child visited first in this term's dataflow should be returned.

Specified by:

firstChild in interface Term

acceptCFG

public java.util.List acceptCFG(CFGBuilder v,
                                java.util.List succs)

Description copied from class: Term_c

Visit this term in evaluation order.

Specified by:

acceptCFG in interface Term

Specified by:

acceptCFG in class Term_c

copy

public Node copy(NodeFactory nf)

Description copied from interface: NodeOps

Produce a copy of this node using the given NodeFactory.

Specified by:

copy in interface NodeOps

Overrides:

copy in class Node_c