com.adamcornett.cminus
Class SymbolTable

java.lang.Object
  com.adamcornett.cminus.SymbolTable

public class SymbolTable
extends Object

A table for storing symbols

Author:

Adam Cornett

Field Summary

private Map<TokenLocation,Symbol>	symbolsByLoc A map keyed of the definition location of a symbol.
private Map<String,Symbol>	symbolsByName A map keyed off the name of a symbol

Constructor Summary

SymbolTable()

Method Summary

void	add(Symbol symbol) Add a symbol to this table.
Symbol	get(String s) Lookup a symbol by name
Symbol	get(TokenLocation location) Look up a symbol by its definition location
int	size()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

symbolsByLoc

private final Map<TokenLocation,Symbol> symbolsByLoc

A map keyed of the definition location of a symbol.

symbolsByName

private final Map<String,Symbol> symbolsByName

A map keyed off the name of a symbol

Constructor Detail

SymbolTable

public SymbolTable()

Method Detail

add

public void add(Symbol symbol)

Add a symbol to this table.

Parameters:

symbol - The symbol to be added

get

public Symbol get(String s)

Lookup a symbol by name

Parameters:

s - The name of the symbol

Returns:

The symbol object if it is found, or NULL if it is not found

get

public Symbol get(TokenLocation location)

Look up a symbol by its definition location

Parameters:

location - The location where a token was defined.

Returns:

The symbol object, or NULL if it is not found.

toString

public String toString()

Overrides:

toString in class Object

size

public int size()