: Class ScanWord

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org.PingOO.DLAI.lib.graph
Class ScanWord

java.lang.Object
  |
  +--java.io.StreamTokenizer
        |
        +--org.PingOO.DLAI.lib.graph.ScanWord

Direct Known Subclasses:: BuildGraph

public class ScanWord
extends java.io.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:: $Revision: 1.5 $, $Date: 1996/07/24 00:19:41 $
Author:: Leigh Brookshaw

Field Summary
`static int`	`ERROR` Token returned when an error is encountered
`private java.io.InputStream`	`is` Private Variables
`private java.util.Hashtable`	`kwords`
`static int`	`STRING` Token returned when a string has been found.
`private char`	`StringChar`
`static int`	`UNKNOWN` Token returned when an unknown characters match nothing

Fields inherited from class java.io.StreamTokenizer

buf,  
CT_ALPHA,  
CT_COMMENT,  
CT_DIGIT,  
CT_QUOTE,  
CT_WHITESPACE,  
ctype,  
eolIsSignificantP,  
forceLower,  
input,  
LINENO,  
nval,  
peekc,  
pushedBack,  
reader,  
slashSlashCommentsP,  
slashStarCommentsP,  
sval,  
TT_EOF,  
TT_EOL,  
TT_NOTHING,  
TT_NUMBER,  
TT_WORD,  
ttype

Constructor Summary
`ScanWord(java.io.InputStream in)` Instantiate the class with the parsed input stream.

Method Summary
`void`	`addKeyWord(java.lang.String s, int i)` Add a keyword/token pair.
`protected void`	`closeStream()` Close the input stream
`int`	`getKeyValue(java.lang.String s)` return the matching token given the keyword
`protected int`	`getNumber(java.lang.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
`int`	`nextWord()` Read the input stream and return the next token found.
`void`	`resetKeyWords()` Clear the internal table containing the keyword/token pairs
`protected void`	`resetWordSyntax()` Reset the syntax of the parent class
`void`	`setStringChar(char c)` Set the character that delimeters a string.

Methods inherited from class java.io.StreamTokenizer

commentChar, 
eolIsSignificant, 
lineno, 
lowerCaseMode, 
nextToken, 
ordinaryChar, 
ordinaryChars, 
parseNumbers, 
pushBack, 
quoteChar, 
read, 
resetSyntax, 
slashSlashComments, 
slashStarComments, 
toString, 
whitespaceChars, 
wordChars

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN

public static final int UNKNOWN

Token returned when an unknown characters match nothing

ERROR

public static final int ERROR

Token returned when an error is encountered

STRING

public static final int STRING

Token returned when a string has been found. A string is defined to be text between matching quotes " ".

is

private java.io.InputStream is

Private Variables

kwords

private java.util.Hashtable kwords

StringChar

private char StringChar

Constructor Detail

ScanWord

public ScanWord(java.io.InputStream in)

Instantiate the class with the parsed input stream.

Parameters:: in - Input stream to read from

Method Detail

addKeyWord

public void addKeyWord(java.lang.String s,
                       int i)

Add a keyword/token pair.

Parameters:: s - String contining the keyword; i - Token to return when the keyword is encountered.

getKeyValue

public int getKeyValue(java.lang.String s)

return the matching token given the keyword

Parameters:: s - Keyword.

resetKeyWords

public void resetKeyWords()

Clear the internal table containing the keyword/token pairs

nextWord

public int nextWord()

Read the input stream and return the next token found.

setStringChar

public void setStringChar(char c)

Set the character that delimeters a string.

Parameters:: c - character to delimeter strings. Default is ".

getNumber

protected int getNumber(java.lang.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.

resetWordSyntax

protected void resetWordSyntax()

Reset the syntax of the parent class

closeStream

protected void closeStream()

Close the input stream