JDK8/Java8源码在线阅读
/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.swing.text;
import java.io.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
/**
* <code>MaskFormatter</code> is used to format and edit strings. The behavior
* of a <code>MaskFormatter</code> is controlled by way of a String mask
* that specifies the valid characters that can be contained at a particular
* location in the <code>Document</code> model. The following characters can
* be specified:
*
* <table border=1 summary="Valid characters and their descriptions">
* <tr>
* <th>Character </th>
* <th><p style="text-align:left">Description</p></th>
* </tr>
* <tr>
* <td>#</td>
* <td>Any valid number, uses <code>Character.isDigit</code>.</td>
* </tr>
* <tr>
* <td>'</td>
* <td>Escape character, used to escape any of the
* special formatting characters.</td>
* </tr>
* <tr>
* <td>U</td><td>Any character (<code>Character.isLetter</code>). All
* lowercase letters are mapped to upper case.</td>
* </tr>
* <tr><td>L</td><td>Any character (<code>Character.isLetter</code>). All
* upper case letters are mapped to lower case.</td>
* </tr>
* <tr><td>A</td><td>Any character or number (<code>Character.isLetter</code>
* or <code>Character.isDigit</code>)</td>
* </tr>
* <tr><td>?</td><td>Any character
* (<code>Character.isLetter</code>).</td>
* </tr>
* <tr><td>*</td><td>Anything.</td></tr>
* <tr><td>H</td><td>Any hex character (0-9, a-f or A-F).</td></tr>
* </table>
*
* <p>
* Typically characters correspond to one char, but in certain languages this
* is not the case. The mask is on a per character basis, and will thus
* adjust to fit as many chars as are needed.
* <p>
* You can further restrict the characters that can be input by the
* <code>setInvalidCharacters</code> and <code>setValidCharacters</code>
* methods. <code>setInvalidCharacters</code> allows you to specify
* which characters are not legal. <code>setValidCharacters</code> allows
* you to specify which characters are valid. For example, the following
* code block is equivalent to a mask of '0xHHH' with no invalid/valid
* characters:
* <pre>
* MaskFormatter formatter = new MaskFormatter("0x***");
* formatter.setValidCharacters("0123456789abcdefABCDEF");
* </pre>
* <p>
* When initially formatting a value if the length of the string is
* less than the length of the mask, two things can happen. Either
* the placeholder string will be used, or the placeholder character will
* be used. Precedence is given to the placeholder string. For example:
* <pre>
* MaskFormatter formatter = new MaskFormatter("###-####");
* formatter.setPlaceholderCharacter('_');
* formatter.getDisplayValue(tf, "123");
* </pre>
* <p>
* Would result in the string '123-____'. If
* <code>setPlaceholder("555-1212")</code> was invoked '123-1212' would
* result. The placeholder String is only used on the initial format,
* on subsequent formats only the placeholder character will be used.
* <p>
* If a <code>MaskFormatter</code> is configured to only allow valid characters
* (<code>setAllowsInvalid(false)</code>) literal characters will be skipped as
* necessary when editing. Consider a <code>MaskFormatter</code> with
* the mask "###-####" and current value "555-1212". Using the right
* arrow key to navigate through the field will result in (| indicates the
* position of the caret):
* <pre>
* |555-1212
* 5|55-1212
* 55|5-1212
* 555-|1212
* 555-1|212
* </pre>
* The '-' is a literal (non-editable) character, and is skipped.
* <p>
* Similar behavior will result when editing. Consider inserting the string
* '123-45' and '12345' into the <code>MaskFormatter</code> in the
* previous example. Both inserts will result in the same String,
* '123-45__'. When <code>MaskFormatter</code>
* is processing the insert at character position 3 (the '-'), two things can
* happen:
* <ol>
* <li>If the inserted character is '-', it is accepted.
* <li>If the inserted character matches the mask for the next non-literal
* character, it is accepted at the new location.
* <li>Anything else results in an invalid edit
* </ol>
* <p>
* By default <code>MaskFormatter</code> will not allow invalid edits, you can
* change this with the <code>setAllowsInvalid</code> method, and will
* commit edits on valid edits (use the <code>setCommitsOnValidEdit</code> to
* change this).
* <p>
* By default, <code>MaskFormatter</code> is in overwrite mode. That is as
* characters are typed a new character is not inserted, rather the character
* at the current location is replaced with the newly typed character. You
* can change this behavior by way of the method <code>setOverwriteMode</code>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @since 1.4
*/
public class MaskFormatter extends DefaultFormatter {
// Potential values in mask.
private static final char DIGIT_KEY = '#';
private static final char LITERAL_KEY = '\'';
private static final char UPPERCASE_KEY = 'U';
private static final char LOWERCASE_KEY = 'L';
private static final char ALPHA_NUMERIC_KEY = 'A';
private static final char CHARACTER_KEY = '?';
private static final char ANYTHING_KEY = '*';
private static final char HEX_KEY = 'H';
private static final MaskCharacter[] EmptyMaskChars = new MaskCharacter[0];
/** The user specified mask. */
private String mask;
private transient MaskCharacter[] maskChars;
/** List of valid characters. */
private String validCharacters;
/** List of invalid characters. */
private String invalidCharacters;
/** String used for the passed in value if it does not completely
* fill the mask. */
private String placeholderString;
/** String used to represent characters not present. */
private char placeholder;
/** Indicates if the value contains the literal characters. */
private boolean containsLiteralChars;
/**
* Creates a MaskFormatter with no mask.
*/
public MaskFormatter() {
setAllowsInvalid(false);
containsLiteralChars = true;
maskChars = EmptyMaskChars;
placeholder = ' ';
}
/**
* Creates a <code>MaskFormatter</code> with the specified mask.
* A <code>ParseException</code>
* will be thrown if <code>mask</code> is an invalid mask.
*
* @throws ParseException if mask does not contain valid mask characters
*/
public MaskFormatter(String mask) throws ParseException {
this();
setMask(mask);
}
/**
* Sets the mask dictating the legal characters.
* This will throw a <code>ParseException</code> if <code>mask</code> is
* not valid.
*
* @throws ParseException if mask does not contain valid mask characters
*/
public void setMask(String mask) throws ParseException {
this.mask = mask;
updateInternalMask();
}
/**
* Returns the formatting mask.
*
* @return Mask dictating legal character values.
*/
public String getMask() {
return mask;
}
/**
* Allows for further restricting of the characters that can be input.
* Only characters specified in the mask, not in the
* <code>invalidCharacters</code>, and in
* <code>validCharacters</code> will be allowed to be input. Passing
* in null (the default) implies the valid characters are only bound
* by the mask and the invalid characters.
*
* @param validCharacters If non-null, specifies legal characters.
*/
public void setValidCharacters(String validCharacters) {
this.validCharacters = validCharacters;
}
/**
* Returns the valid characters that can be input.
*
* @return Legal characters
*/
public String getValidCharacters() {
return validCharacters;
}
/**
* Allows for further restricting of the characters that can be input.
* Only characters specified in the mask, not in the
* <code>invalidCharacters</code>, and in
* <code>validCharacters</code> will be allowed to be input. Passing
* in null (the default) implies the valid characters are only bound
* by the mask and the valid characters.
*
* @param invalidCharacters If non-null, specifies illegal characters.
*/
public void setInvalidCharacters(String invalidCharacters) {
this.invalidCharacters = invalidCharacters;
}
/**
* Returns the characters that are not valid for input.
*
* @return illegal characters.
*/
public String getInvalidCharacters() {
return invalidCharacters;
}
/**
* Sets the string to use if the value does not completely fill in
* the mask. A null value implies the placeholder char should be used.
*
* @param placeholder String used when formatting if the value does not
* completely fill the mask
*/
public void setPlaceholder(String placeholder) {
this.placeholderString = placeholder;
}
/**
* Returns the String to use if the value does not completely fill
* in the mask.
*
* @return String used when formatting if the value does not
* completely fill the mask
*/
public String getPlaceholder() {
return placeholderString;
}
/**
* Sets the character to use in place of characters that are not present
* in the value, ie the user must fill them in. The default value is
* a space.
* <p>
* This is only applicable if the placeholder string has not been
* specified, or does not completely fill in the mask.
*
* @param placeholder Character used when formatting if the value does not
* completely fill the mask
*/
public void setPlaceholderCharacter(char placeholder) {
this.placeholder = placeholder;
}
/**
* Returns the character to use in place of characters that are not present
* in the value, ie the user must fill them in.
*
* @return Character used when formatting if the value does not
* completely fill the mask
*/
public char getPlaceholderCharacter() {
return placeholder;
}
/**
* If true, the returned value and set value will also contain the literal
* characters in mask.
* <p>
* For example, if the mask is <code>'(###) ###-####'</code>, the
* current value is <code>'(415) 555-1212'</code>, and
* <code>valueContainsLiteralCharacters</code> is
* true <code>stringToValue</code> will return
* <code>'(415) 555-1212'</code>. On the other hand, if
* <code>valueContainsLiteralCharacters</code> is false,
* <code>stringToValue</code> will return <code>'4155551212'</code>.
*
* @param containsLiteralChars Used to indicate if literal characters in
* mask should be returned in stringToValue
*/
public void setValueContainsLiteralCharacters(
boolean containsLiteralChars) {
this.containsLiteralChars = containsLiteralChars;
}
/**
* Returns true if <code>stringToValue</code> should return literal
* characters in the mask.
*
* @return True if literal characters in mask should be returned in
* stringToValue
*/
public boolean getValueContainsLiteralCharacters() {
return containsLiteralChars;
}
/**
* Parses the text, returning the appropriate Object representation of
* the String <code>value</code>. This strips the literal characters as
* necessary and invokes supers <code>stringToValue</code>, so that if
* you have specified a value class (<code>setValueClass</code>) an
* instance of it will be created. This will throw a
* <code>ParseException</code> if the value does not match the current
* mask. Refer to {@link #setValueContainsLiteralCharacters} for details
* on how literals are treated.
*
* @throws ParseException if there is an error in the conversion
* @param value String to convert
* @see #setValueContainsLiteralCharacters
* @return Object representation of text
*/
public Object stringToValue(String value) throws ParseException {
return stringToValue(value, true);
}
/**
* Returns a String representation of the Object <code>value</code>
* based on the mask. Refer to
* {@link #setValueContainsLiteralCharacters} for details
* on how literals are treated.
*
* @throws ParseException if there is an error in the conversion
* @param value Value to convert
* @see #setValueContainsLiteralCharacters
* @return String representation of value
*/
public String valueToString(Object value) throws ParseException {
String sValue = (value == null) ? "" : value.toString();
StringBuilder result = new StringBuilder();
String placeholder = getPlaceholder();
int[] valueCounter = { 0 };
append(result, sValue, valueCounter, placeholder, maskChars);
return result.toString();
}
/**
* Installs the <code>DefaultFormatter</code> onto a particular
* <code>JFormattedTextField</code>.
* This will invoke <code>valueToString</code> to convert the
* current value from the <code>JFormattedTextField</code> to
* a String. This will then install the <code>Action</code>s from
* <code>getActions</code>, the <code>DocumentFilter</code>
* returned from <code>getDocumentFilter</code> and the
* <code>NavigationFilter</code> returned from
* <code>getNavigationFilter</code> onto the
* <code>JFormattedTextField</code>.
* <p>
* Subclasses will typically only need to override this if they
* wish to install additional listeners on the
* <code>JFormattedTextField</code>.
* <p>
* If there is a <code>ParseException</code> in converting the
* current value to a String, this will set the text to an empty
* String, and mark the <code>JFormattedTextField</code> as being
* in an invalid state.
* <p>
* While this is a public method, this is typically only useful
* for subclassers of <code>JFormattedTextField</code>.
* <code>JFormattedTextField</code> will invoke this method at
* the appropriate times when the value changes, or its internal
* state changes.
*
* @param ftf JFormattedTextField to format for, may be null indicating
* uninstall from current JFormattedTextField.
*/
public void install(JFormattedTextField ftf) {
super.install(ftf);
// valueToString doesn't throw, but stringToValue does, need to
// update the editValid state appropriately
if (ftf != null) {
Object value = ftf.getValue();
try {
stringToValue(valueToString(value));
} catch (ParseException pe) {
setEditValid(false);
}
}
}
/**
* Actual <code>stringToValue</code> implementation.
* If <code>completeMatch</code> is true, the value must exactly match
* the mask, on the other hand if <code>completeMatch</code> is false
* the string must match the mask or the placeholder string.
*/
private Object stringToValue(String value, boolean completeMatch) throws
ParseException {
int errorOffset;
if ((errorOffset = getInvalidOffset(value, completeMatch)) == -1) {
if (!getValueContainsLiteralCharacters()) {
value = stripLiteralChars(value);
}
return super.stringToValue(value);
}
throw new ParseException("stringToValue passed invalid value",
errorOffset);
}
/**
* Returns -1 if the passed in string is valid, otherwise the index of
* the first bogus character is returned.
*/
private int getInvalidOffset(String string, boolean completeMatch) {
int iLength = string.length();
if (iLength != getMaxLength()) {
// trivially false
return iLength;
}
for (int counter = 0, max = string.length(); counter < max; counter++){
char aChar = string.charAt(counter);
if (!isValidCharacter(counter, aChar) &&
(completeMatch || !isPlaceholder(counter, aChar))) {
return counter;
}
}
return -1;
}
/**
* Invokes <code>append</code> on the mask characters in
* <code>mask</code>.
*/
private void append(StringBuilder result, String value, int[] index,
String placeholder, MaskCharacter[] mask)
throws ParseException {
for (int counter = 0, maxCounter = mask.length;
counter < maxCounter; counter++) {
mask[counter].append(result, value, index, placeholder);
}
}
/**
* Updates the internal representation of the mask.
*/
private void updateInternalMask() throws ParseException {
String mask = getMask();
ArrayList<MaskCharacter> fixed = new ArrayList<MaskCharacter>();
ArrayList<MaskCharacter> temp = fixed;
if (mask != null) {
for (int counter = 0, maxCounter = mask.length();
counter < maxCounter; counter++) {
char maskChar = mask.charAt(counter);
switch (maskChar) {
case DIGIT_KEY:
temp.add(new DigitMaskCharacter());
break;
case LITERAL_KEY:
if (++counter < maxCounter) {
maskChar = mask.charAt(counter);
temp.add(new LiteralCharacter(maskChar));
}
// else: Could actually throw if else
break;
case UPPERCASE_KEY:
temp.add(new UpperCaseCharacter());
break;
case LOWERCASE_KEY:
temp.add(new LowerCaseCharacter());
break;
case ALPHA_NUMERIC_KEY:
temp.add(new AlphaNumericCharacter());
break;
case CHARACTER_KEY:
temp.add(new CharCharacter());
break;
case ANYTHING_KEY:
temp.add(new MaskCharacter());
break;
case HEX_KEY:
temp.add(new HexCharacter());
break;
default:
temp.add(new LiteralCharacter(maskChar));
break;
}
}
}
if (fixed.size() == 0) {
maskChars = EmptyMaskChars;
}
else {
maskChars = new MaskCharacter[fixed.size()];
fixed.toArray(maskChars);
}
}
/**
* Returns the MaskCharacter at the specified location.
*/
private MaskCharacter getMaskCharacter(int index) {
if (index >= maskChars.length) {
return null;
}
return maskChars[index];
}
/**
* Returns true if the placeholder character matches aChar.
*/
private boolean isPlaceholder(int index, char aChar) {
return (getPlaceholderCharacter() == aChar);
}
/**
* Returns true if the passed in character matches the mask at the
* specified location.
*/
private boolean isValidCharacter(int index, char aChar) {
return getMaskCharacter(index).isValidCharacter(aChar);
}
/**
* Returns true if the character at the specified location is a literal,
* that is it can not be edited.
*/
private boolean isLiteral(int index) {
return getMaskCharacter(index).isLiteral();
}
/**
* Returns the maximum length the text can be.
*/
private int getMaxLength() {
return maskChars.length;
}
/**
* Returns the literal character at the specified location.
*/
private char getLiteral(int index) {
return getMaskCharacter(index).getChar((char)0);
}
/**
* Returns the character to insert at the specified location based on
* the passed in character. This provides a way to map certain sets
* of characters to alternative values (lowercase to
* uppercase...).
*/
private char getCharacter(int index, char aChar) {
return getMaskCharacter(index).getChar(aChar);
}
/**
* Removes the literal characters from the passed in string.
*/
private String stripLiteralChars(String string) {
StringBuilder sb = null;
int last = 0;
for (int counter = 0, max = string.length(); counter < max; counter++){
if (isLiteral(counter)) {
if (sb == null) {
sb = new StringBuilder();
if (counter > 0) {
sb.append(string.substring(0, counter));
}
last = counter + 1;
}
else if (last != counter) {
sb.append(string.substring(last, counter));
}
last = counter + 1;
}
}
if (sb == null) {
// Assume the mask isn't all literals.
return string;
}
else if (last != string.length()) {
if (sb == null) {
return string.substring(last);
}
sb.append(string.substring(last));
}
return sb.toString();
}
/**
* Subclassed to update the internal representation of the mask after
* the default read operation has completed.
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException {
s.defaultReadObject();
try {
updateInternalMask();
} catch (ParseException pe) {
// assert();
}
}
/**
* Returns true if the MaskFormatter allows invalid, or
* the offset is less than the max length and the character at
* <code>offset</code> is a literal.
*/
boolean isNavigatable(int offset) {
if (!getAllowsInvalid()) {
return (offset < getMaxLength() && !isLiteral(offset));
}
return true;
}
/*
* Returns true if the operation described by <code>rh</code> will
* result in a legal edit. This may set the <code>value</code>
* field of <code>rh</code>.
* <p>
* This is overriden to return true for a partial match.
*/
boolean isValidEdit(ReplaceHolder rh) {
if (!getAllowsInvalid()) {
String newString = getReplaceString(rh.offset, rh.length, rh.text);
try {
rh.value = stringToValue(newString, false);
return true;
} catch (ParseException pe) {
return false;
}
}
return true;
}
/**
* This method does the following (assuming !getAllowsInvalid()):
* iterate over the max of the deleted region or the text length, for
* each character:
* <ol>
* <li>If it is valid (matches the mask at the particular position, or
* matches the literal character at the position), allow it
* <li>Else if the position identifies a literal character, add it. This
* allows for the user to paste in text that may/may not contain
* the literals. For example, in pasing in 5551212 into ###-####
* when the 1 is evaluated it is illegal (by the first test), but there
* is a literal at this position (-), so it is used. NOTE: This has
* a problem that you can't tell (without looking ahead) if you should
* eat literals in the text. For example, if you paste '555' into
* #5##, should it result in '5555' or '555 '? The current code will
* result in the latter, which feels a little better as selecting
* text than pasting will always result in the same thing.
* <li>Else if at the end of the inserted text, the replace the item with
* the placeholder
* <li>Otherwise the insert is bogus and false is returned.
* </ol>
*/
boolean canReplace(ReplaceHolder rh) {
// This method is rather long, but much of the burden is in
// maintaining a String and swapping to a StringBuilder only if
// absolutely necessary.
if (!getAllowsInvalid()) {
StringBuilder replace = null;
String text = rh.text;
int tl = (text != null) ? text.length() : 0;
if (tl == 0 && rh.length == 1 && getFormattedTextField().
getSelectionStart() != rh.offset) {
// Backspace, adjust to actually delete next non-literal.
while (rh.offset > 0 && isLiteral(rh.offset)) {
rh.offset--;
}
}
int max = Math.min(getMaxLength() - rh.offset,
Math.max(tl, rh.length));
for (int counter = 0, textIndex = 0; counter < max; counter++) {
if (textIndex < tl && isValidCharacter(rh.offset + counter,
text.charAt(textIndex))) {
char aChar = text.charAt(textIndex);
if (aChar != getCharacter(rh.offset + counter, aChar)) {
if (replace == null) {
replace = new StringBuilder();
if (textIndex > 0) {
replace.append(text.substring(0, textIndex));
}
}
}
if (replace != null) {
replace.append(getCharacter(rh.offset + counter,
aChar));
}
textIndex++;
}
else if (isLiteral(rh.offset + counter)) {
if (replace != null) {
replace.append(getLiteral(rh.offset + counter));
if (textIndex < tl) {
max = Math.min(max + 1, getMaxLength() -
rh.offset);
}
}
else if (textIndex > 0) {
replace = new StringBuilder(max);
replace.append(text.substring(0, textIndex));
replace.append(getLiteral(rh.offset + counter));
if (textIndex < tl) {
// Evaluate the character in text again.
max = Math.min(max + 1, getMaxLength() -
rh.offset);
}
else if (rh.cursorPosition == -1) {
rh.cursorPosition = rh.offset + counter;
}
}
else {
rh.offset++;
rh.length--;
counter--;
max--;
}
}
else if (textIndex >= tl) {
// placeholder
if (replace == null) {
replace = new StringBuilder();
if (text != null) {
replace.append(text);
}
}
replace.append(getPlaceholderCharacter());
if (tl > 0 && rh.cursorPosition == -1) {
rh.cursorPosition = rh.offset + counter;
}
}
else {
// Bogus character.
return false;
}
}
if (replace != null) {
rh.text = replace.toString();
}
else if (text != null && rh.offset + tl > getMaxLength()) {
rh.text = text.substring(0, getMaxLength() - rh.offset);
}
if (getOverwriteMode() && rh.text != null) {
rh.length = rh.text.length();
}
}
return super.canReplace(rh);
}
//
// Interal classes used to represent the mask.
//
private class MaskCharacter {
/**
* Subclasses should override this returning true if the instance
* represents a literal character. The default implementation
* returns false.
*/
public boolean isLiteral() {
return false;
}
/**
* Returns true if <code>aChar</code> is a valid reprensentation of
* the receiver. The default implementation returns true if the
* receiver represents a literal character and <code>getChar</code>
* == aChar. Otherwise, this will return true is <code>aChar</code>
* is contained in the valid characters and not contained
* in the invalid characters.
*/
public boolean isValidCharacter(char aChar) {
if (isLiteral()) {
return (getChar(aChar) == aChar);
}
aChar = getChar(aChar);
String filter = getValidCharacters();
if (filter != null && filter.indexOf(aChar) == -1) {
return false;
}
filter = getInvalidCharacters();
if (filter != null && filter.indexOf(aChar) != -1) {
return false;
}
return true;
}
/**
* Returns the character to insert for <code>aChar</code>. The
* default implementation returns <code>aChar</code>. Subclasses
* that wish to do some sort of mapping, perhaps lower case to upper
* case should override this and do the necessary mapping.
*/
public char getChar(char aChar) {
return aChar;
}
/**
* Appends the necessary character in <code>formatting</code> at
* <code>index</code> to <code>buff</code>.
*/
public void append(StringBuilder buff, String formatting, int[] index,
String placeholder)
throws ParseException {
boolean inString = index[0] < formatting.length();
char aChar = inString ? formatting.charAt(index[0]) : 0;
if (isLiteral()) {
buff.append(getChar(aChar));
if (getValueContainsLiteralCharacters()) {
if (inString && aChar != getChar(aChar)) {
throw new ParseException("Invalid character: " +
aChar, index[0]);
}
index[0] = index[0] + 1;
}
}
else if (index[0] >= formatting.length()) {
if (placeholder != null && index[0] < placeholder.length()) {
buff.append(placeholder.charAt(index[0]));
}
else {
buff.append(getPlaceholderCharacter());
}
index[0] = index[0] + 1;
}
else if (isValidCharacter(aChar)) {
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