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* <td>Any valid number, uses Character.isDigit. * </tr> * <tr> * <td>' * <td>Escape character, used to escape any of the * special formatting characters.</td> * </tr> * <tr> * <td>U * </tr> * <tr> * </tr> * <tr> * <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 and setValidCharacters * methods. <code>setInvalidCharacters allows you to specify * which characters are not legal. <code>setValidCharacters 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") 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 is configured to only allow valid characters * (<code>setAllowsInvalid(false)) literal characters will be skipped as * necessary when editing. Consider a <code>MaskFormatter 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 in the * previous example. Both inserts will result in the same String, * '123-45__'. When <code>MaskFormatter * 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 will not allow invalid edits, you can * change this with the <code>setAllowsInvalid method, and will * commit edits on valid edits (use the <code>setCommitsOnValidEdit to * change this). * <p> * By default, <code>MaskFormatter 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. * <p> * <strong>Warning: * 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 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 with the specified mask. * A <code>ParseException * will be thrown if <code>mask 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 if mask 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, and in * <code>validCharacters 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, and in * <code>validCharacters 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>'(###) ###-####', the * current value is <code>'(415) 555-1212', and * <code>valueContainsLiteralCharacters is * true <code>stringToValue will return * <code>'(415) 555-1212'. On the other hand, if * <code>valueContainsLiteralCharacters is false, * <code>stringToValue will return '4155551212'. * * @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 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. This strips the literal characters as * necessary and invokes supers <code>stringToValue, so that if * you have specified a value class (<code>setValueClass) an * instance of it will be created. This will throw a * <code>ParseException 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 * 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 onto a particular * <code>JFormattedTextField. * This will invoke <code>valueToString to convert the * current value from the <code>JFormattedTextField to * a String. This will then install the <code>Actions from * <code>getActions, the DocumentFilter * returned from <code>getDocumentFilter and the * <code>NavigationFilter returned from * <code>getNavigationFilter onto the * <code>JFormattedTextField. * <p> * Subclasses will typically only need to override this if they * wish to install additional listeners on the * <code>JFormattedTextField. * <p> * If there is a <code>ParseException in converting the * current value to a String, this will set the text to an empty * String, and mark the <code>JFormattedTextField as being * in an invalid state. * <p> * While this is a public method, this is typically only useful * for subclassers of <code>JFormattedTextField. * <code>JFormattedTextField 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 implementation. * If <code>completeMatch is true, the value must exactly match * the mask, on the other hand if <code>completeMatch 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 on the mask characters in * <code>mask. */ 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(); 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 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 will * result in a legal edit. This may set the <code>value * field of <code>rh. * <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 is a valid reprensentation of * the receiver. The default implementation returns true if the * receiver represents a literal character and <code>getChar * == aChar. Otherwise, this will return true is <code>aChar * 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. The * default implementation returns <code>aChar. 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 at * <code>index to buff. */ 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)) { buff.append(getChar(aChar)); index[0] = index[0] + 1; } else { throw new ParseException("Invalid character: " + aChar, index[0]); } } } /** * Used to represent a fixed character in the mask. */ private class LiteralCharacter extends MaskCharacter { private char fixedChar; public LiteralCharacter(char fixedChar) { this.fixedChar = fixedChar; } public boolean isLiteral() { return true; } public char getChar(char aChar) { return fixedChar; } } /** * Represents a number, uses <code>Character.isDigit. */ private class DigitMaskCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return (Character.isDigit(aChar) && super.isValidCharacter(aChar)); } } /** * Represents a character, lower case letters are mapped to upper case * using <code>Character.toUpperCase. */ private class UpperCaseCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return (Character.isLetter(aChar) && super.isValidCharacter(aChar)); } public char getChar(char aChar) { return Character.toUpperCase(aChar); } } /** * Represents a character, upper case letters are mapped to lower case * using <code>Character.toLowerCase. */ private class LowerCaseCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return (Character.isLetter(aChar) && super.isValidCharacter(aChar)); } public char getChar(char aChar) { return Character.toLowerCase(aChar); } } /** * Represents either a character or digit, uses * <code>Character.isLetterOrDigit. */ private class AlphaNumericCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return (Character.isLetterOrDigit(aChar) && super.isValidCharacter(aChar)); } } /** * Represents a letter, uses <code>Character.isLetter. */ private class CharCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return (Character.isLetter(aChar) && super.isValidCharacter(aChar)); } } /** * Represents a hex character, 0-9a-fA-F. a-f is mapped to A-F */ private class HexCharacter extends MaskCharacter { public boolean isValidCharacter(char aChar) { return ((aChar == '0' || aChar == '1' || aChar == '2' || aChar == '3' || aChar == '4' || aChar == '5' || aChar == '6' || aChar == '7' || aChar == '8' || aChar == '9' || aChar == 'a' || aChar == 'A' || aChar == 'b' || aChar == 'B' || aChar == 'c' || aChar == 'C' || aChar == 'd' || aChar == 'D' || aChar == 'e' || aChar == 'E' || aChar == 'f' || aChar == 'F') && super.isValidCharacter(aChar)); } public char getChar(char aChar) { if (Character.isDigit(aChar)) { return aChar; } return Character.toUpperCase(aChar); } } }

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Java example source code file (MaskFormatter.java)

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Java - Java tags/keywords

arraylist, digit_key, emptymaskchars, gui, hexcharacter, invalid, literal_key, literalcharacter, lowercase_key, maskcharacter, maskformatter, object, parseexception, string, stringbuilder, swing, text, util

The MaskFormatter.java Java example source code

/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.swing.text;

import java.io.*;
import java.text.*;
import java.util.*;
import javax.swing.*;

/**
 * <code>MaskFormatter is used to format and edit strings. The behavior
 * of a <code>MaskFormatter 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 model. The following characters can
 * be specified:
 *
 * <table border=1 summary="Valid characters and their descriptions">
 * <tr>
 *    <th>Character 
 *    <th>

Description

* </tr> * <tr> * <td>#
Any character (Character.isLetter). All * lowercase letters are mapped to upper case.</td> * </tr> * <tr>LAny character (Character.isLetter). All * upper case letters are mapped to lower case.</td> * </tr> * <tr>AAny character or number (Character.isLetter * or <code>Character.isDigit)?Any character * (<code>Character.isLetter).*Anything.
HAny hex character (0-9, a-f or A-F).
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