com.sun.jdo.spi.persistence.support.ejb.ejbqlc
Class SymbolTable

java.lang.Object
  com.sun.jdo.spi.persistence.support.ejb.ejbqlc.SymbolTable

public class SymbolTable
extends Object

The symbol table handling declared identifies.

Author:

Michael Bouschen

Field Summary

protected Map

symbols The table of declared identifier (symbols).

Constructor Summary

SymbolTable()

Method Summary

Object	declare(String ident, Object decl) This method adds the specified identifier to this SymbolTable.
Object	getDeclaration(String ident) Checks the symbol table for the actual declaration of the specified identifier.
boolean	isDeclared(String ident) Checks whether the specified identifier is declared.

Methods inherited from class java.lang.Object

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

Field Detail

symbols

protected Map symbols

The table of declared identifier (symbols).

Constructor Detail

SymbolTable

public SymbolTable()

Method Detail

declare

public Object declare(String ident,
                      Object decl)

This method adds the specified identifier to this SymbolTable. The specified decl object provides details anbout the declaration. If this SymbolTable already defines an identifier with the same name, the SymbolTable is not changed and the existing declaration is returned. Otherwise null is returned.

Parameters:

ident - identifier to be declared

decl - new definition of identifier

Returns:

the old definition if the identifier was already declared; null otherwise

isDeclared

public boolean isDeclared(String ident)

Checks whether the specified identifier is declared.

Parameters:

ident - the name of identifier to be tested

Returns:

true if the identifier is declared; false otherwise.

getDeclaration

public Object getDeclaration(String ident)

Checks the symbol table for the actual declaration of the specified identifier. The method returns the declaration object if available or null for an undeclared identifier.

Parameters:

ident - the name of identifier

Returns:

the declaration object if ident is declared; null otherise.