/**
* set / update the text of the displayLabels. these are the Week column headers above the days on
* the Calendar part of the <code>CDateTime</code>.
*/
private void updateDaysOfWeek() {
if (dayPanel != null) {
Calendar tmpcal = cdt.getCalendarInstance();
tmpcal.set(Calendar.DAY_OF_WEEK, tmpcal.getFirstDayOfWeek());
Locale locale = cdt.getLocale();
boolean ltr =
(ComponentOrientation.getOrientation(locale).isLeftToRight()
&& !locale.getLanguage().equals("zh")); // $NON-NLS-1$
BreakIterator iterator = BreakIterator.getCharacterInstance(locale);
for (int x = 0; x < dayLabels.length; x++) {
String str = getFormattedDate("E", tmpcal.getTime()); // $NON-NLS-1$
if (dayLabels[x].getData(CDT.Key.Compact, Boolean.class)) {
iterator.setText(str);
int start, end;
if (ltr) {
start = iterator.first();
end = iterator.next();
} else {
end = iterator.last();
start = iterator.previous();
}
dayLabels[x].setText(str.substring(start, end));
} else {
dayLabels[x].setText(str);
}
tmpcal.add(Calendar.DAY_OF_WEEK, 1);
}
}
}
@Override
protected BoundaryScanner get(String fieldName, SolrParams params) {
// construct Locale
String language = params.getFieldParam(fieldName, HighlightParams.BS_LANGUAGE);
String country = params.getFieldParam(fieldName, HighlightParams.BS_COUNTRY);
if (country != null && language == null) {
throw new SolrException(
ErrorCode.BAD_REQUEST,
HighlightParams.BS_LANGUAGE
+ " parameter cannot be null when you specify "
+ HighlightParams.BS_COUNTRY);
}
Locale locale = null;
if (language != null) {
locale = country == null ? new Locale(language) : new Locale(language, country);
} else {
locale = Locale.ROOT;
}
// construct BreakIterator
String type =
params.getFieldParam(fieldName, HighlightParams.BS_TYPE, "WORD").toLowerCase(Locale.ROOT);
BreakIterator bi = null;
if (type.equals("character")) {
bi = BreakIterator.getCharacterInstance(locale);
} else if (type.equals("word")) {
bi = BreakIterator.getWordInstance(locale);
} else if (type.equals("line")) {
bi = BreakIterator.getLineInstance(locale);
} else if (type.equals("sentence")) {
bi = BreakIterator.getSentenceInstance(locale);
} else
throw new SolrException(
ErrorCode.BAD_REQUEST, type + " is invalid for parameter " + HighlightParams.BS_TYPE);
return new org.apache.lucene.search.vectorhighlight.BreakIteratorBoundaryScanner(bi);
}
// LIU: Changed from final to non-final
public class DumbTextComponent extends Canvas
implements KeyListener, MouseListener, MouseMotionListener, FocusListener {
/** For serialization */
private static final long serialVersionUID = 8265547730738652151L;
// private transient static final String copyright =
// "Copyright \u00A9 1998, Mark Davis. All Rights Reserved.";
private static transient boolean DEBUG = false;
private String contents = "";
private Selection selection = new Selection();
private int activeStart = -1;
private boolean editable = true;
private transient Selection tempSelection = new Selection();
private transient boolean focus;
private transient BreakIterator lineBreaker = BreakIterator.getLineInstance();
private transient BreakIterator wordBreaker = BreakIterator.getWordInstance();
private transient BreakIterator charBreaker = BreakIterator.getCharacterInstance();
private transient int lineAscent;
private transient int lineHeight;
private transient int lineLeading;
private transient int lastHeight = 10;
private transient int lastWidth = 50;
private static final int MAX_LINES = 200; // LIU: Use symbolic name
private transient int[] lineStarts = new int[MAX_LINES]; // LIU
private transient int lineCount = 1;
private transient boolean valid = false;
private transient FontMetrics fm;
private transient boolean redoLines = true;
private transient boolean doubleClick = false;
private transient TextListener textListener;
private transient ActionListener selectionListener;
private transient Image cacheImage;
private transient Dimension mySize;
private transient int xInset = 5;
private transient int yInset = 5;
private transient Point startPoint = new Point();
private transient Point endPoint = new Point();
private transient Point caretPoint = new Point();
private transient Point activePoint = new Point();
// private transient static String clipBoard;
private static final char CR = '\015'; // LIU
// ============================================
public DumbTextComponent() {
addMouseListener(this);
addMouseMotionListener(this);
addKeyListener(this);
addFocusListener(this);
setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));
}
// ================ Events ====================
// public boolean isFocusTraversable() { return true; }
public void addActionListener(ActionListener l) {
selectionListener = AWTEventMulticaster.add(selectionListener, l);
}
public void removeActionListener(ActionListener l) {
selectionListener = AWTEventMulticaster.remove(selectionListener, l);
}
public void addTextListener(TextListener l) {
textListener = AWTEventMulticaster.add(textListener, l);
}
public void removeTextListener(TextListener l) {
textListener = AWTEventMulticaster.remove(textListener, l);
}
private transient boolean pressed;
public void mousePressed(MouseEvent e) {
if (DEBUG) System.out.println("mousePressed");
if (pressed) {
select(e, false);
} else {
doubleClick = e.getClickCount() > 1;
requestFocus();
select(e, true);
pressed = true;
}
}
public void mouseDragged(MouseEvent e) {
if (DEBUG) System.out.println("mouseDragged");
select(e, false);
}
public void mouseReleased(MouseEvent e) {
if (DEBUG) System.out.println("mouseReleased");
pressed = false;
}
public void mouseEntered(MouseEvent e) {
// if (pressed) select(e, false);
}
public void mouseExited(MouseEvent e) {
// if (pressed) select(e, false);
}
public void mouseClicked(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
public void focusGained(FocusEvent e) {
if (DEBUG) System.out.println("focusGained");
focus = true;
valid = false;
repaint(16);
}
public void focusLost(FocusEvent e) {
if (DEBUG) System.out.println("focusLost");
focus = false;
valid = false;
repaint(16);
}
public void select(MouseEvent e, boolean first) {
setKeyStart(-1);
point2Offset(e.getPoint(), tempSelection);
if (first) {
if ((e.getModifiers() & InputEvent.SHIFT_MASK) == 0) {
tempSelection.anchor = tempSelection.caret;
}
}
// fix words
if (doubleClick) {
tempSelection.expand(wordBreaker);
}
select(tempSelection);
}
public void keyPressed(KeyEvent e) {
int code = e.getKeyCode();
if (DEBUG)
System.out.println("keyPressed " + hex((char) code) + ", " + hex((char) e.getModifiers()));
int start = selection.getStart();
int end = selection.getEnd();
boolean shift = (e.getModifiers() & InputEvent.SHIFT_MASK) != 0;
boolean ctrl = (e.getModifiers() & InputEvent.CTRL_MASK) != 0;
switch (code) {
case KeyEvent.VK_Q:
if (!ctrl || !editable) break;
setKeyStart(-1);
fixHex();
break;
case KeyEvent.VK_V:
if (!ctrl) break;
if (!editable) {
this.getToolkit().beep();
} else {
paste();
}
break;
case KeyEvent.VK_C:
if (!ctrl) break;
copy();
break;
case KeyEvent.VK_X:
if (!ctrl) break;
if (!editable) {
this.getToolkit().beep();
} else {
copy();
insertText("");
}
break;
case KeyEvent.VK_A:
if (!ctrl) break;
setKeyStart(-1);
select(Integer.MAX_VALUE, 0, false);
break;
case KeyEvent.VK_RIGHT:
setKeyStart(-1);
tempSelection.set(selection);
tempSelection.nextBound(ctrl ? wordBreaker : charBreaker, +1, shift);
select(tempSelection);
break;
case KeyEvent.VK_LEFT:
setKeyStart(-1);
tempSelection.set(selection);
tempSelection.nextBound(ctrl ? wordBreaker : charBreaker, -1, shift);
select(tempSelection);
break;
case KeyEvent.VK_UP: // LIU: Add support for up arrow
setKeyStart(-1);
tempSelection.set(selection);
tempSelection.caret = lineDelta(tempSelection.caret, -1);
if (!shift) {
tempSelection.anchor = tempSelection.caret;
}
select(tempSelection);
break;
case KeyEvent.VK_DOWN: // LIU: Add support for down arrow
setKeyStart(-1);
tempSelection.set(selection);
tempSelection.caret = lineDelta(tempSelection.caret, +1);
if (!shift) {
tempSelection.anchor = tempSelection.caret;
}
select(tempSelection);
break;
case KeyEvent.VK_DELETE: // LIU: Add delete key support
if (!editable) break;
setKeyStart(-1);
if (contents.length() == 0) break;
start = selection.getStart();
end = selection.getEnd();
if (start == end) {
++end;
if (end > contents.length()) {
getToolkit().beep();
return;
}
}
replaceRange("", start, end);
break;
}
}
void copy() {
Clipboard cb = this.getToolkit().getSystemClipboard();
StringSelection ss =
new StringSelection(contents.substring(selection.getStart(), selection.getEnd()));
cb.setContents(ss, ss);
}
void paste() {
Clipboard cb = this.getToolkit().getSystemClipboard();
Transferable t = cb.getContents(this);
if (t == null) {
this.getToolkit().beep();
return;
}
try {
String temp = (String) t.getTransferData(DataFlavor.stringFlavor);
insertText(temp);
} catch (Exception e) {
this.getToolkit().beep();
}
}
/**
* LIU: Given an offset into contents, moves up or down by lines, according to lineStarts[].
*
* @param off the offset into contents
* @param delta how many lines to move up (< 0) or down (> 0)
* @return the new offset into contents
*/
private int lineDelta(int off, int delta) {
int line = findLine(off, false);
int posInLine = off - lineStarts[line];
// System.out.println("off=" + off + " at " + line + ":" + posInLine);
line += delta;
if (line < 0) {
line = posInLine = 0;
} else if (line >= lineCount) {
return contents.length();
}
off = lineStarts[line] + posInLine;
if (off >= lineStarts[line + 1]) {
off = lineStarts[line + 1] - 1;
}
return off;
}
public void keyReleased(KeyEvent e) {
int code = e.getKeyCode();
if (DEBUG)
System.out.println("keyReleased " + hex((char) code) + ", " + hex((char) e.getModifiers()));
}
public void keyTyped(KeyEvent e) {
char ch = e.getKeyChar();
if (DEBUG)
System.out.println("keyTyped " + hex((char) ch) + ", " + hex((char) e.getModifiers()));
if ((e.getModifiers() & InputEvent.CTRL_MASK) != 0) return;
int start, end;
switch (ch) {
case KeyEvent.CHAR_UNDEFINED:
break;
case KeyEvent.VK_BACK_SPACE:
// setKeyStart(-1);
if (!editable) break;
if (contents.length() == 0) break;
start = selection.getStart();
end = selection.getEnd();
if (start == end) {
--start;
if (start < 0) {
getToolkit().beep(); // LIU: Add audio feedback of NOP
return;
}
}
replaceRange("", start, end);
break;
case KeyEvent.VK_DELETE:
// setKeyStart(-1);
if (!editable) break;
if (contents.length() == 0) break;
start = selection.getStart();
end = selection.getEnd();
if (start == end) {
++end;
if (end > contents.length()) {
getToolkit().beep(); // LIU: Add audio feedback of NOP
return;
}
}
replaceRange("", start, end);
break;
default:
if (!editable) break;
// LIU: Dispatch to subclass API
handleKeyTyped(e);
break;
}
}
// LIU: Subclass API for handling of key typing
protected void handleKeyTyped(KeyEvent e) {
insertText(String.valueOf(e.getKeyChar()));
}
protected void setKeyStart(int keyStart) {
if (activeStart != keyStart) {
activeStart = keyStart;
repaint(10);
}
}
protected void validateKeyStart() {
if (activeStart > selection.getStart()) {
activeStart = selection.getStart();
repaint(10);
}
}
protected int getKeyStart() {
return activeStart;
}
// ===================== Control ======================
public synchronized void setEditable(boolean b) {
editable = b;
}
public boolean isEditable() {
return editable;
}
public void select(Selection newSelection) {
newSelection.pin(contents);
if (!selection.equals(newSelection)) {
selection.set(newSelection);
if (selectionListener != null) {
selectionListener.actionPerformed(
new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "Selection Changed", 0));
}
repaint(10);
valid = false;
}
}
public void select(int start, int end) {
select(start, end, false);
}
public void select(int start, int end, boolean clickAfter) {
tempSelection.set(start, end, clickAfter);
select(tempSelection);
}
public int getSelectionStart() {
return selection.getStart();
}
public int getSelectionEnd() {
return selection.getEnd();
}
public void setBounds(int x, int y, int w, int h) {
super.setBounds(x, y, w, h);
redoLines = true;
}
public Dimension getPreferredSize() {
return new Dimension(lastWidth, lastHeight);
}
public Dimension getMaximumSize() {
return new Dimension(lastWidth, lastHeight);
}
public Dimension getMinimumSize() {
return new Dimension(lastHeight, lastHeight);
}
public void setText(String text) {
setText2(text);
select(tempSelection.set(selection).pin(contents));
}
public void setText2(String text) {
contents = text;
charBreaker.setText(text);
wordBreaker.setText(text);
lineBreaker.setText(text);
redoLines = true;
if (textListener != null)
textListener.textValueChanged(new TextEvent(this, TextEvent.TEXT_VALUE_CHANGED));
repaint(16);
}
public void insertText(String text) {
if (activeStart == -1) activeStart = selection.getStart();
replaceRange(text, selection.getStart(), selection.getEnd());
}
public void replaceRange(String s, int start, int end) {
setText2(contents.substring(0, start) + s + contents.substring(end));
select(tempSelection.set(selection).fixAfterReplace(start, end, s.length()));
validateKeyStart();
}
public String getText() {
return contents;
}
public void setFont(Font font) {
super.setFont(font);
redoLines = true;
repaint(16);
}
// ================== Graphics ======================
public void update(Graphics g) {
if (DEBUG) System.out.println("update");
paint(g);
}
public void paint(Graphics g) {
mySize = getSize();
if (cacheImage == null
|| cacheImage.getHeight(this) != mySize.height
|| cacheImage.getWidth(this) != mySize.width) {
cacheImage = createImage(mySize.width, mySize.height);
valid = false;
}
if (!valid || redoLines) {
if (DEBUG) System.out.println("painting");
paint2(cacheImage.getGraphics());
valid = true;
}
// getToolkit().sync();
if (DEBUG) System.out.println("copying");
g.drawImage(
cacheImage, 0, 0, mySize.width, mySize.height, 0, 0, mySize.width, mySize.height, this);
}
public void paint2(Graphics g) {
g.clearRect(0, 0, mySize.width, mySize.height);
if (DEBUG) System.out.println("print");
if (focus) g.setColor(Color.black);
else g.setColor(Color.gray);
g.drawRect(0, 0, mySize.width - 1, mySize.height - 1);
g.setClip(1, 1, mySize.width - 2, mySize.height - 2);
g.setColor(Color.black);
g.setFont(getFont());
fm = g.getFontMetrics();
lineAscent = fm.getAscent();
lineLeading = fm.getLeading();
lineHeight = lineAscent + fm.getDescent() + lineLeading;
int y = yInset + lineAscent;
String lastSubstring = "";
if (redoLines) fixLineStarts(mySize.width - xInset - xInset);
for (int i = 0; i < lineCount; y += lineHeight, ++i) {
// LIU: Don't display terminating ^M characters
int lim = lineStarts[i + 1];
if (lim > 0 && contents.length() > 0 && contents.charAt(lim - 1) == CR) --lim;
lastSubstring = contents.substring(lineStarts[i], lim);
g.drawString(lastSubstring, xInset, y);
}
drawSelection(g, lastSubstring);
lastHeight = y + yInset - lineHeight + yInset;
lastWidth = mySize.width - xInset - xInset;
}
void paintRect(Graphics g, int x, int y, int w, int h) {
if (focus) {
g.fillRect(x, y, w, h);
} else {
g.drawRect(x, y, w - 1, h - 1);
}
}
public void drawSelection(Graphics g, String lastSubstring) {
g.setXORMode(Color.black);
if (activeStart != -1) {
offset2Point(activeStart, false, activePoint);
g.setColor(Color.magenta);
int line = activePoint.x - 1;
g.fillRect(line, activePoint.y, 1, lineHeight);
}
if (selection.isCaret()) {
offset2Point(selection.caret, selection.clickAfter, caretPoint);
} else {
if (focus) g.setColor(Color.blue);
else g.setColor(Color.yellow);
offset2Point(selection.getStart(), true, startPoint);
offset2Point(selection.getEnd(), false, endPoint);
if (selection.getStart() == selection.caret) caretPoint.setLocation(startPoint);
else caretPoint.setLocation(endPoint);
if (startPoint.y == endPoint.y) {
paintRect(
g, startPoint.x, startPoint.y, Math.max(1, endPoint.x - startPoint.x), lineHeight);
} else {
paintRect(
g, startPoint.x, startPoint.y, (mySize.width - xInset) - startPoint.x, lineHeight);
if (startPoint.y + lineHeight < endPoint.y)
paintRect(
g,
xInset,
startPoint.y + lineHeight,
(mySize.width - xInset) - xInset,
endPoint.y - startPoint.y - lineHeight);
paintRect(g, xInset, endPoint.y, endPoint.x - xInset, lineHeight);
}
}
if (focus || selection.isCaret()) {
if (focus) g.setColor(Color.green);
else g.setColor(Color.red);
int line = caretPoint.x - (selection.clickAfter ? 0 : 1);
g.fillRect(line, caretPoint.y, 1, lineHeight);
int w = lineHeight / 12 + 1;
int braces = line - (selection.clickAfter ? -1 : w);
g.fillRect(braces, caretPoint.y, w, 1);
g.fillRect(braces, caretPoint.y + lineHeight - 1, w, 1);
}
}
public Point offset2Point(int off, boolean start, Point p) {
int line = findLine(off, start);
int width = 0;
try {
width = fm.stringWidth(contents.substring(lineStarts[line], off));
} catch (Exception e) {
System.out.println(e);
}
p.x = width + xInset;
if (p.x > mySize.width - xInset) p.x = mySize.width - xInset;
p.y = lineHeight * line + yInset;
return p;
}
private int findLine(int off, boolean start) {
// if it is start, then go to the next line!
if (start) ++off;
for (int i = 1; i < lineCount; ++i) {
// LIU: This was <= ; changed to < to make caret after
// final CR in line appear at START of next line.
if (off < lineStarts[i]) return i - 1;
}
// LIU: Check for special case; after CR at end of the last line
if (off == lineStarts[lineCount]
&& off > 0
&& contents.length() > 0
&& contents.charAt(off - 1) == CR) {
return lineCount;
}
return lineCount - 1;
}
// offsets on any line will go from start,true to end,false
// excluding start,false and end,true
public Selection point2Offset(Point p, Selection o) {
if (p.y < yInset) {
o.caret = 0;
o.clickAfter = true;
return o;
}
int line = (p.y - yInset) / lineHeight;
if (line >= lineCount) {
o.caret = contents.length();
o.clickAfter = false;
return o;
}
int target = p.x - xInset;
if (target <= 0) {
o.caret = lineStarts[line];
o.clickAfter = true;
return o;
}
int lowGuess = lineStarts[line];
int lowWidth = 0;
int highGuess = lineStarts[line + 1];
int highWidth = fm.stringWidth(contents.substring(lineStarts[line], highGuess));
if (target >= highWidth) {
o.caret = lineStarts[line + 1];
o.clickAfter = false;
return o;
}
while (lowGuess < highGuess - 1) {
int guess = (lowGuess + highGuess) / 2;
int width = fm.stringWidth(contents.substring(lineStarts[line], guess));
if (width <= target) {
lowGuess = guess;
lowWidth = width;
if (width == target) break;
} else {
highGuess = guess;
highWidth = width;
}
}
// at end, either lowWidth < target < width(low+1), or lowWidth = target
int highBound = charBreaker.following(lowGuess);
int lowBound = charBreaker.previous();
// we are now at character boundaries
if (lowBound != lowGuess)
lowWidth = fm.stringWidth(contents.substring(lineStarts[line], lowBound));
if (highBound != highGuess)
highWidth = fm.stringWidth(contents.substring(lineStarts[line], highBound));
// we now have the right widths
if (target - lowWidth < highWidth - target) {
o.caret = lowBound;
o.clickAfter = true;
} else {
o.caret = highBound;
o.clickAfter = false;
}
// we now have the closest!
return o;
}
private void fixLineStarts(int width) {
lineCount = 1;
lineStarts[0] = 0;
if (contents.length() == 0) {
lineStarts[1] = 0;
return;
}
int end = 0;
// LIU: Add check for MAX_LINES
for (int start = 0; start < contents.length() && lineCount < MAX_LINES; start = end) {
end = nextLine(fm, start, width);
lineStarts[lineCount++] = end;
if (end == start) { // LIU: Assertion
throw new RuntimeException("nextLine broken");
}
}
--lineCount;
redoLines = false;
}
// LIU: Enhanced to wrap long lines. Bug with return of start fixed.
public int nextLine(FontMetrics fMtr, int start, int width) {
int len = contents.length();
for (int i = start; i < len; ++i) {
// check for line separator
char ch = (contents.charAt(i));
if (ch >= 0x000A && ch <= 0x000D || ch == 0x2028 || ch == 0x2029) {
len = i + 1;
if (ch == 0x000D && i + 1 < len && contents.charAt(i + 1) == 0x000A) // crlf
++len; // grab extra char
break;
}
}
String subject = contents.substring(start, len);
if (visibleWidth(fMtr, subject) <= width) return len;
// LIU: Remainder of this method rewritten to accomodate lines
// longer than the component width by first trying to break
// into lines; then words; finally chars.
int n = findFittingBreak(fMtr, subject, width, lineBreaker);
if (n == 0) {
n = findFittingBreak(fMtr, subject, width, wordBreaker);
}
if (n == 0) {
n = findFittingBreak(fMtr, subject, width, charBreaker);
}
return n > 0 ? start + n : len;
}
/**
* LIU: Finds the longest substring that fits a given width composed of subunits returned by a
* BreakIterator. If the smallest subunit is too long, returns 0.
*
* @param fMtr metrics to use
* @param line the string to be fix into width
* @param width line.substring(0, result) must be <= width
* @param breaker the BreakIterator that will be used to find subunits
* @return maximum characters, at boundaries returned by breaker, that fit into width, or zero on
* failure
*/
private int findFittingBreak(FontMetrics fMtr, String line, int width, BreakIterator breaker) {
breaker.setText(line);
int last = breaker.first();
int end = breaker.next();
while (end != BreakIterator.DONE && visibleWidth(fMtr, line.substring(0, end)) <= width) {
last = end;
end = breaker.next();
}
return last;
}
public int visibleWidth(FontMetrics fMtr, String s) {
int i;
for (i = s.length() - 1; i >= 0; --i) {
char ch = s.charAt(i);
if (!(ch == ' ' || ch >= 0x000A && ch <= 0x000D || ch == 0x2028 || ch == 0x2029))
return fMtr.stringWidth(s.substring(0, i + 1));
}
return 0;
}
// =============== Utility ====================
private void fixHex() {
if (selection.getEnd() == 0) return;
int store = 0;
int places = 1;
int count = 0;
int min = Math.min(8, selection.getEnd());
for (int i = 0; i < min; ++i) {
char ch = contents.charAt(selection.getEnd() - 1 - i);
int value = Character.getNumericValue(ch);
if (value < 0 || value > 15) break;
store += places * value;
++count;
places *= 16;
}
String add = "";
int bottom = store & 0xFFFF;
if (store >= 0xD8000000
&& store < 0xDC000000
&& bottom >= 0xDC00
&& bottom < 0xE000) { // surrogates
add = "" + (char) (store >> 16) + (char) bottom;
} else if (store > 0xFFFF && store <= 0x10FFFF) {
store -= 0x10000;
add = "" + (char) (((store >> 10) & 0x3FF) + 0xD800) + (char) ((store & 0x3FF) + 0xDC00);
} else if (count >= 4) {
count = 4;
add = "" + (char) (store & 0xFFFF);
} else {
count = 1;
char ch = contents.charAt(selection.getEnd() - 1);
add = hex(ch);
if (ch >= 0xDC00 && ch <= 0xDFFF && selection.getEnd() > 1) {
ch = contents.charAt(selection.getEnd() - 2);
if (ch >= 0xD800 && ch <= 0xDBFF) {
count = 2;
add = hex(ch) + add;
}
}
}
replaceRange(add, selection.getEnd() - count, selection.getEnd());
}
public static String hex(char ch) {
String result = Integer.toString(ch, 16).toUpperCase();
result = "0000".substring(result.length(), 4) + result;
return result;
}
}
