name.angoca.db2sa.core.lexical
Class ImplLexicalAnalyzer

java.lang.Object
  name.angoca.db2sa.core.lexical.AbstractLexicalAnalyzer
      name.angoca.db2sa.core.lexical.ImplLexicalAnalyzer

public final class ImplLexicalAnalyzer
extends AbstractLexicalAnalyzer

This is the implementation of the lexical analyzer.
Control Version

• 0.0.1 Class creation.
• 0.1.0
• 0.2.0
• 0.3.0 Recommendations from PMD.
• 0.3.1 Organized.
• 0.4.0 Invalid Graph Exception.
• 0.5.0 Destroy instance.
• 0.5.1 Logger messages.
• 0.6.0 Delimiters not set in a static way.
• 1.0.0 Moved to version 1.

Version:

1.0.0 2009-07-19

Author:

Andres Gomez Casanova (AngocA)

Method Summary

static void	destroyInstance() Destroys the instance.
static ImplLexicalAnalyzer	getInstance() Creates the only possible instance of this object.
ReturnOptions	processPhrase(String phrase) Process a given phrase that represents a command and sends the options in the screen printer.
protected String	replaceLastToken(String phrase, List<Token> tokens, GraphAnswer answer) Retrieves a phrase with the last token modified.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static ImplLexicalAnalyzer getInstance()
                                       throws InvalidGraphException

Creates the only possible instance of this object. This method can be called after defining the delimiters for this object.

Returns:

This object instanced.

Throws:

InvalidGraphException - When there is a problem creating the graph.

destroyInstance

public static void destroyInstance()

Destroys the instance. It is useful for testings purposes.

processPhrase

public ReturnOptions processPhrase(String phrase)
                            throws InvalidGraphException

Description copied from class: AbstractLexicalAnalyzer

Process a given phrase that represents a command and sends the options in the screen printer.

Specified by:

processPhrase in class AbstractLexicalAnalyzer

Parameters:

phrase - Phrase to process.

Returns:

Set of options for the current phrase and the phrase to print.

Throws:

InvalidGraphException - When the graph that represents the grammar is invalid.

replaceLastToken

protected String replaceLastToken(String phrase,
                                  List<Token> tokens,
                                  GraphAnswer answer)

Retrieves a phrase with the last token modified. The modification depends on the answer of the grammatical analyzer.

Parameters:

phrase - Original phrase.

tokens - Set of token that represents the original phrase.

answer - New phrase returned by the grammatical analyzer.

Returns:

a phrase with the last token modified according to the answer.