prolog.implementation
Class SymbolTable

java.lang.Object
  |
  +--prolog.implementation.SymbolTable

All Implemented Interfaces:

ISymbolTable

public class SymbolTable

extends java.lang.Object

implements ISymbolTable

The symboltable is created by the scanner and parser during parsing. All identifiers and strings of the sourceprogram are replaced by a number. In the symboltable, the relation between the number and the original string is stored

Field Summary

(package private) static int	instanceCount a instance counter for hacked debug purpose
protected java.util.Map	wordMap a map storing all words found in program the key is the word, the index in the word list the value
protected java.util.List	words a list storing all words with their index found in program

Constructor Summary

SymbolTable()
create a symboltable

Method Summary

void	clear() clears the symboltyble
java.lang.String	decode(IAtom index) decodes the given word
java.lang.String	decode(int index) decodes the given word
java.lang.String	decode(java.lang.Object obj) decodes the given word
int	encode(java.lang.String word) encodes the given word
void	genXml(java.io.Writer out) generates a xml representation of this symboltable
private int	getIndex(java.lang.String word) returns the index of the given word in the symboltable
java.lang.String	toString() returns a string representation of this symboltable

Methods inherited from class java.lang.Object

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

Field Detail

instanceCount

static int instanceCount

a instance counter for hacked debug purpose

words

protected java.util.List words

a list storing all words with their index found in program

wordMap

protected java.util.Map wordMap

a map storing all words found in program the key is the word, the index in the word list the value

Constructor Detail

SymbolTable

public SymbolTable()

create a symboltable

Method Detail

clear

public void clear()

clears the symboltyble

Specified by:

clear in interface ISymbolTable

encode

public int encode(java.lang.String word)

encodes the given word

Specified by:

encode in interface ISymbolTable

Parameters:

word -

Returns:

decode

public java.lang.String decode(IAtom index)

decodes the given word

Specified by:

decode in interface ISymbolTable

Following copied from interface: prolog.model.ISymbolTable

Parameters:

index -

Returns:

decode

public java.lang.String decode(int index)

decodes the given word

Specified by:

decode in interface ISymbolTable

Following copied from interface: prolog.model.ISymbolTable

Parameters:

index -

Returns:

decode

public java.lang.String decode(java.lang.Object obj)

decodes the given word

getIndex

private int getIndex(java.lang.String word)

returns the index of the given word in the symboltable

Returns:

genXml

public void genXml(java.io.Writer out)
            throws java.io.IOException

generates a xml representation of this symboltable

Specified by:

genXml in interface ISymbolTable

Throws:

java.io.IOException -

toString

public java.lang.String toString()

returns a string representation of this symboltable

Overrides:

toString in class java.lang.Object