org.apache.jdo.impl.jdoql.scope

Class SymbolTable

java.lang.Object

org.apache.jdo.impl.jdoql.scope.SymbolTable

public class SymbolTable
extends java.lang.Object

The symbol table handling declared identifies.

Author:

Michael Bouschen

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.Map	symbols The table of declared identifier (symbols).

Constructor Summary

Constructors

Constructor and Description
SymbolTable()

Method Summary

Methods

Modifier and Type	Method and Description
Declaration	declare(java.lang.String ident, Declaration def) This method adds the specified identifier to this SymbolTable.
Declaration	getDeclaration(java.lang.String ident) Checks the symbol table for the actual declaration of the specified identifier.
boolean	isDeclared(java.lang.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 java.util.Map symbols

The table of declared identifier (symbols).

Constructor Detail

SymbolTable

public SymbolTable()

Method Detail

declare

public Declaration declare(java.lang.String ident,
                  Declaration def)

This method adds the specified identifier to this SymbolTable. The specified declaration node 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

def - new definition of identifier

Returns:

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

isDeclared

public boolean isDeclared(java.lang.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 Declaration getDeclaration(java.lang.String ident)

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

Parameters:

ident - the name of identifier

Returns:

the declaration node if ident is declared; null otherise.