Class SimpleTokenManager

All Implemented Interfaces:
Cloneable, TokenManager
Direct Known Subclasses:

class SimpleTokenManager
extends Object
implements TokenManager, Cloneable

Field Summary
protected  int maxToken
protected  String name
protected  boolean readOnly
private  Hashtable table
protected  Tool tool
protected  Vector vocabulary
Constructor Summary
(package private) SimpleTokenManager(String name_, Tool tool_)
Method Summary
 Object clone()
          Creates and returns a copy of this object.
 void define(TokenSymbol ts)
          define a token
 String getName()
          Simple token manager doesn't have a name -- must be set externally
 String getTokenStringAt(int idx)
          Get a token symbol by index
 TokenSymbol getTokenSymbol(String sym)
          Get the TokenSymbol for a string
 TokenSymbol getTokenSymbolAt(int idx)
          Get a token symbol by index
 Enumeration getTokenSymbolElements()
          Get an enumerator over the symbol table
 Enumeration getTokenSymbolKeys()
 Vector getVocabulary()
          Get the token vocabulary (read-only).
 boolean isReadOnly()
          Simple token manager is not read-only
 void mapToTokenSymbol(String name, TokenSymbol sym)
          Map a label or string to an existing token symbol
 int maxTokenType()
          Get the highest token type in use
 int nextTokenType()
          Get the next unused token type
 void setName(String name_)
          Set the name of the token manager
 void setReadOnly(boolean ro)
 boolean tokenDefined(String symbol)
          Is a token symbol defined?
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


protected int maxToken


protected Vector vocabulary


private Hashtable table


protected Tool tool


protected String name


protected boolean readOnly
Constructor Detail


SimpleTokenManager(String name_,
                   Tool tool_)
Method Detail


public Object clone()
Description copied from class: Object
Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. The general intent is that, for any object x, the expression:
 x.clone() != x
will be true, and that the expression:
 x.clone().getClass() == x.getClass()
will be true, but these are not absolute requirements. While it is typically the case that:
will be true, this is not an absolute requirement.

By convention, the returned object should be obtained by calling super.clone. If a class and all of its superclasses (except Object) obey this convention, it will be the case that x.clone().getClass() == x.getClass().

By convention, the object returned by this method should be independent of this object (which is being cloned). To achieve this independence, it may be necessary to modify one or more fields of the object returned by super.clone before returning it. Typically, this means copying any mutable objects that comprise the internal "deep structure" of the object being cloned and replacing the references to these objects with references to the copies. If a class contains only primitive fields or references to immutable objects, then it is usually the case that no fields in the object returned by super.clone need to be modified.

The method clone for class Object performs a specific cloning operation. First, if the class of this object does not implement the interface Cloneable, then a CloneNotSupportedException is thrown. Note that all arrays are considered to implement the interface Cloneable. Otherwise, this method creates a new instance of the class of this object and initializes all its fields with exactly the contents of the corresponding fields of this object, as if by assignment; the contents of the fields are not themselves cloned. Thus, this method performs a "shallow copy" of this object, not a "deep copy" operation.

The class Object does not itself implement the interface Cloneable, so calling the clone method on an object whose class is Object will result in throwing an exception at run time.

Specified by:
clone in interface TokenManager
clone in class Object
a clone of this instance.
See Also:


public void define(TokenSymbol ts)
define a token

Specified by:
define in interface TokenManager


public String getName()
Simple token manager doesn't have a name -- must be set externally

Specified by:
getName in interface TokenManager


public String getTokenStringAt(int idx)
Get a token symbol by index

Specified by:
getTokenStringAt in interface TokenManager


public TokenSymbol getTokenSymbol(String sym)
Get the TokenSymbol for a string

Specified by:
getTokenSymbol in interface TokenManager


public TokenSymbol getTokenSymbolAt(int idx)
Get a token symbol by index

Specified by:
getTokenSymbolAt in interface TokenManager


public Enumeration getTokenSymbolElements()
Get an enumerator over the symbol table

Specified by:
getTokenSymbolElements in interface TokenManager


public Enumeration getTokenSymbolKeys()
Specified by:
getTokenSymbolKeys in interface TokenManager


public Vector getVocabulary()
Get the token vocabulary (read-only).

Specified by:
getVocabulary in interface TokenManager
A Vector of TokenSymbol


public boolean isReadOnly()
Simple token manager is not read-only

Specified by:
isReadOnly in interface TokenManager


public void mapToTokenSymbol(String name,
                             TokenSymbol sym)
Map a label or string to an existing token symbol

Specified by:
mapToTokenSymbol in interface TokenManager


public int maxTokenType()
Get the highest token type in use

Specified by:
maxTokenType in interface TokenManager


public int nextTokenType()
Get the next unused token type

Specified by:
nextTokenType in interface TokenManager


public void setName(String name_)
Set the name of the token manager

Specified by:
setName in interface TokenManager


public void setReadOnly(boolean ro)
Specified by:
setReadOnly in interface TokenManager


public boolean tokenDefined(String symbol)
Is a token symbol defined?

Specified by:
tokenDefined in interface TokenManager