Parsing classes: Class VALIIParser

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Class VALIIParser

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.TextComponent
              |
              +--java.awt.TextArea
                    |
                    +--VALIIParser

public class VALIIParser
extends java.awt.TextArea

This class is the culmination of all of these other classes. It is an extension of TextArea and when the processProgram() method is called the contents of of the textArea sre processed and events are thrown to any registered listeners.

See Also:: Serialized Form

Field Summary
`protected MovementRequestListener`	`listener` The listener for any events generated

Fields inherited from class java.awt.TextArea

SCROLLBARS_BOTH,  
SCROLLBARS_HORIZONTAL_ONLY,  
SCROLLBARS_NONE,  
SCROLLBARS_VERTICAL_ONLY

Fields inherited from class java.awt.TextComponent

textListener

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT,  
CENTER_ALIGNMENT,  
LEFT_ALIGNMENT,  
RIGHT_ALIGNMENT,  
TOP_ALIGNMENT

Constructor Summary
`VALIIParser()` By default a `TextArea` of height 30 and width 20 is created with only vertical scroll bars and no text.
`VALIIParser(int rows, int cols)` Creates a `TextArea` of height `rows` and width `cols` and only vertical scrool bars.

Method Summary
`void`	`addMovementRequestListener(MovementRequestListener l)` Adds a listener to the events generated by `processProgram()`.
`void`	`clear()` Clears the contents of the text box.
`void`	`processProgram()` Very simply this method does the processing of the text and generates the appropriate events.
`void`	`removeMovementRequestListener(MovementRequestListener l)` Removes a listener to the events generated by `processProgram()`.

Methods inherited from class java.awt.TextArea

addNotify, 
append, 
appendText, 
getColumns, 
getMinimumSize, 
getMinimumSize, 
getPreferredSize, 
getPreferredSize, 
getRows, 
getScrollbarVisibility, 
insert, 
insertText, 
minimumSize, 
minimumSize, 
paramString, 
preferredSize, 
preferredSize, 
replaceRange, 
replaceText, 
setColumns, 
setRows

Methods inherited from class java.awt.TextComponent

addTextListener, 
getCaretPosition, 
getSelectedText, 
getSelectionEnd, 
getSelectionStart, 
getText, 
isEditable, 
processEvent, 
processTextEvent, 
removeNotify, 
removeTextListener, 
select, 
selectAll, 
setCaretPosition, 
setEditable, 
setSelectionEnd, 
setSelectionStart, 
setText

Methods inherited from class java.awt.Component

action, 
add, 
addComponentListener, 
addFocusListener, 
addInputMethodListener, 
addKeyListener, 
addMouseListener, 
addMouseMotionListener, 
addPropertyChangeListener, 
addPropertyChangeListener, 
bounds, 
checkImage, 
checkImage, 
coalesceEvents, 
contains, 
contains, 
createImage, 
createImage, 
deliverEvent, 
disable, 
disableEvents, 
dispatchEvent, 
doLayout, 
enable, 
enable, 
enableEvents, 
enableInputMethods, 
firePropertyChange, 
getAlignmentX, 
getAlignmentY, 
getBackground, 
getBounds, 
getBounds, 
getColorModel, 
getComponentAt, 
getComponentAt, 
getComponentOrientation, 
getCursor, 
getDropTarget, 
getFont, 
getFontMetrics, 
getForeground, 
getGraphics, 
getHeight, 
getInputContext, 
getInputMethodRequests, 
getLocale, 
getLocation, 
getLocation, 
getLocationOnScreen, 
getMaximumSize, 
getName, 
getParent, 
getPeer, 
getSize, 
getSize, 
getToolkit, 
getTreeLock, 
getWidth, 
getX, 
getY, 
gotFocus, 
handleEvent, 
hasFocus, 
hide, 
imageUpdate, 
inside, 
invalidate, 
isDisplayable, 
isDoubleBuffered, 
isEnabled, 
isFocusTraversable, 
isLightweight, 
isOpaque, 
isShowing, 
isValid, 
isVisible, 
keyDown, 
keyUp, 
layout, 
list, 
list, 
list, 
list, 
list, 
locate, 
location, 
lostFocus, 
mouseDown, 
mouseDrag, 
mouseEnter, 
mouseExit, 
mouseMove, 
mouseUp, 
move, 
nextFocus, 
paint, 
paintAll, 
postEvent, 
prepareImage, 
prepareImage, 
print, 
printAll, 
processComponentEvent, 
processFocusEvent, 
processInputMethodEvent, 
processKeyEvent, 
processMouseEvent, 
processMouseMotionEvent, 
remove, 
removeComponentListener, 
removeFocusListener, 
removeInputMethodListener, 
removeKeyListener, 
removeMouseListener, 
removeMouseMotionListener, 
removePropertyChangeListener, 
removePropertyChangeListener, 
repaint, 
repaint, 
repaint, 
repaint, 
requestFocus, 
reshape, 
resize, 
resize, 
setBackground, 
setBounds, 
setBounds, 
setComponentOrientation, 
setCursor, 
setDropTarget, 
setEnabled, 
setFont, 
setForeground, 
setLocale, 
setLocation, 
setLocation, 
setName, 
setSize, 
setSize, 
setVisible, 
show, 
show, 
size, 
toString, 
transferFocus, 
update, 
validate

Methods inherited from class java.lang.Object

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

Field Detail

listener

protected MovementRequestListener listener

The listener for any events generated

Constructor Detail

VALIIParser

public VALIIParser()

By default a TextArea of height 30 and width 20 is created with only vertical scroll bars and no text.

VALIIParser

public VALIIParser(int rows,
                   int cols)

Creates a TextArea of height rows and width cols and only vertical scrool bars.

Parameters:: rows - the number of rows; cols - the number of columns

Method Detail

processProgram

public void processProgram()

Very simply this method does the processing of the text and generates the appropriate events. The algorithm at this point is extremely simple:

The recognized keywords are:

rotate
moveto
reset
toggleaxis
pickup
release
clawchange

All that his function is this:


 
	
	 tokenize the entire program using StringTokenizer with '\n'
	 as the delimiter thereby processing the program line by line
	
	while there are strings remaining in the tokenizer
	
		remove whitespace from the begninning and end of the string
		change the string to lowercase
		check to see if the string begins with any of the keywords
		if the string begins with one of the keywords
		
			
			 intialize the appropriate event with the remainder of the
			 string other than the keyword
			
			
			 throw the event; that is send it to
			 movementRequested
			 in the registered listener (which may in fact be more than one
			 listener through the use of MovementRequestEventMulticaster.
			
		
		
		 otherwise print an error messge to System#out (this will become a
		 throw of anInvalidProgramElement

The method of the processing makes it so that each line of the program is one command (tokenizing according to '\n') and it is case insensitive (calling String#toLowercase before checking for any keywords.

clear

public void clear()

Clears the contents of the text box.

addMovementRequestListener

public void addMovementRequestListener(MovementRequestListener l)

Adds a listener to the events generated by processProgram().

Parameters:: l - a listener

removeMovementRequestListener

public void removeMovementRequestListener(MovementRequestListener l)

Removes a listener to the events generated by processProgram().

Parameters:: l - a listener