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com.thermidor.xml
Class TokenTable  

java.lang.Object
  com.thermidor.xml.TokenTable

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public class TokenTable

extends java.lang.Object

The TokenTable class is a genric token table used to maintain an list of string identifiers to token mappings, and finds particular use in the implementation of parsers.

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Field Summary
private  boolean	checkIntegrity           Flag indication whether the TokenTable instance should check for the integrity of the proposed mappings.
private static java.lang.String	MSG_DUPLICATE_IDENTIFIER           Message constant Duplicate identifier [Identifier] =.
private static java.lang.String	MSG_DUPLICATE_TOKEN           Message constant Duplicate token.
private static java.lang.String	MSG_TOKEN_REASSIGNMENT           Message constant Duplicate identifier and token added.
private static java.lang.String	MSG_UNDEFINED_TOKEN           Message constant A token cannot posses value used to define an undefined mapping:.
static int	NO_TOKEN_DEFINED           Constant used to indicate that no mapping was defined for a given identifier.
private  boolean	ready           Flag indicating whether the TokenTable instance has been declared ready.
private  java.util.HashMap	tokenTable           Essentially the token table for storing the mapping between given identifiers and their tokens.

 

Constructor Summary

TokenTable()           Default constructor.

TokenTable(boolean checkIntegrity)           Instantiates a token table with integrity checking.

 

Method Summary
private  void	assertIntegrity(java.lang.String identifier, int token)           Performs a series of integrity checks on the proposed identifier and token: (a) that the identifier is not NULL (b) that the token is not the reserved value for designating an unknown mapping and (c) that there is no duplication of previously held mapping information.
private  void	assertNoDuplicates(java.lang.String proposedIdentifier, int proposedToken)           Asserts that there is no duplication of previously held mapping information.
private static void	assertNotNull(java.lang.String identifier)           Asserts that the proposed identifier is not Null.
private static void	assertNotUndefinedToken(int proposedToken)           Asserts that the proposed token is not the same as the constant used to designate an undefined mapping.
private  void	assertReady(boolean isReady)           Asserts that the TokenTable is in the state specified in the isReady parameter.
int	getToken(java.lang.String identifier)
boolean	isReady()           Utility method for discovering whether the token table has been declared ready.
void	put(java.lang.String identifier, int token)           Stores the mapping between the identifier and the token.
void	ready()           Signals that the population of the token table has finished.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

NO_TOKEN_DEFINED

public static final int NO_TOKEN_DEFINED

Constant used to indicate that no mapping was defined for a given identifier.

See Also:

Constant Field Values

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tokenTable

private java.util.HashMap tokenTable

Essentially the token table for storing the mapping between given identifiers and their tokens.

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ready

private boolean ready

Flag indicating whether the TokenTable instance has been declared ready. Ready means that no more mappings will be added to the token table and it is ready to be used by clients.

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checkIntegrity

private final boolean checkIntegrity

Flag indication whether the TokenTable instance should check for the integrity of the proposed mappings.

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MSG_UNDEFINED_TOKEN

private static final java.lang.String MSG_UNDEFINED_TOKEN

Message constant A token cannot posses value used to define an undefined mapping:.

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MSG_TOKEN_REASSIGNMENT

private static final java.lang.String MSG_TOKEN_REASSIGNMENT

Message constant Duplicate identifier and token added. [Identifier,TOKEN]=.

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MSG_DUPLICATE_TOKEN

private static final java.lang.String MSG_DUPLICATE_TOKEN

Message constant Duplicate token. [Existing,Token,Identifier] =.

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MSG_DUPLICATE_IDENTIFIER

private static final java.lang.String MSG_DUPLICATE_IDENTIFIER

Message constant Duplicate identifier [Identifier] =.

Constructor Detail

TokenTable

public TokenTable()

Default constructor. Instantiates a token table with integrity checking.

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TokenTable

public TokenTable(boolean checkIntegrity)

Instantiates a token table with integrity checking.

Method Detail

put

public final void put(java.lang.String identifier,
                      int token)

Stores the mapping between the identifier and the token.

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assertIntegrity

private void assertIntegrity(java.lang.String identifier,
                             int token)

Performs a series of integrity checks on the proposed identifier and token: (a) that the identifier is not NULL (b) that the token is not the reserved value for designating an unknown mapping and (c) that there is no duplication of previously held mapping information.

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assertNotNull

private static void assertNotNull(java.lang.String identifier)

Asserts that the proposed identifier is not Null.

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assertNotUndefinedToken

private static void assertNotUndefinedToken(int proposedToken)

Asserts that the proposed token is not the same as the constant used to designate an undefined mapping.

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assertReady

private void assertReady(boolean isReady)

Asserts that the TokenTable is in the state specified in the isReady parameter.

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assertNoDuplicates

private void assertNoDuplicates(java.lang.String proposedIdentifier,
                                int proposedToken)

Asserts that there is no duplication of previously held mapping information.

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getToken

public final int getToken(java.lang.String identifier)

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ready

public void ready()

Signals that the population of the token table has finished. This prevents further mappings from being added to the TokenTable.

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isReady

public boolean isReady()

Utility method for discovering whether the token table has been declared ready.

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