Class graph.ScanWord 
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Class graph.ScanWord 

java.lang.Object
   |
   +----java.io.StreamTokenizer
           |
           +----graph.ScanWord
public class ScanWord
extends StreamTokenizer
This class extends the StreamTokenizer class. It allows words to be defined and recognised and returned as a token. The TT_NUMBER token of the StreamTokenizer is also modified so that scientific notation is recognised.
Version:
1.5, 1996/07/24 00:19:41
Author:
Leigh Brookshaw

Variable Index

o ERROR
Token returned when an error is encountered
o STRING
Token returned when a string has been found.
o UNKNOWN
Token returned when an unknown characters match nothing

Constructor Index

o ScanWord(InputStream)
Instantiate the class with the parsed input stream.

Method Index

o addKeyWord(String, int)
Add a keyword/token pair.
o closeStream()
Close the input stream
o getKeyValue(String)
return the matching token given the keyword
o getNumber(String)
Check to see if the returned word is a number The native StreamTokenizer number method does not work for scientific notation so we us the Double class doubleValue() method
o nextWord()
Read the input stream and return the next token found.
o resetKeyWords()
Clear the internal table containing the keyword/token pairs
o resetWordSyntax()
Reset the syntax of the parent class
o setStringChar(char)
Set the character that delimeters a string.

Variables

o UNKNOWN 
  public final static int UNKNOWN
Token returned when an unknown characters match nothing
o ERROR 
  public final static int ERROR
Token returned when an error is encountered
o STRING 
  public final static int STRING
Token returned when a string has been found. A string is defined to be text between matching quotes " ".

Constructors

o ScanWord 
  public ScanWord(InputStream in)
Instantiate the class with the parsed input stream.
Parameters:
in - Input stream to read from

Methods

o addKeyWord 
  public void addKeyWord(String s,
                         int i)
Add a keyword/token pair.
Parameters:
s - String contining the keyword
i - Token to return when the keyword is encountered.
o getKeyValue 
  public int getKeyValue(String s)
return the matching token given the keyword
Parameters:
s - Keyword.
o resetKeyWords 
  public void resetKeyWords()
Clear the internal table containing the keyword/token pairs
o nextWord 
  public int nextWord()
Read the input stream and return the next token found.
o setStringChar 
  public void setStringChar(char c)
Set the character that delimeters a string.
Parameters:
c - character to delimeter strings. Default is ".
o getNumber 
  protected int getNumber(String s)
Check to see if the returned word is a number The native StreamTokenizer number method does not work for scientific notation so we us the Double class doubleValue() method
Parameters:
s - String to find number.
o resetWordSyntax 
  protected void resetWordSyntax()
Reset the syntax of the parent class
o closeStream 
  protected void closeStream()
Close the input stream 
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