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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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 * 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).
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package javax.swing.text;

import java.lang.reflect.*;
import java.text.*;
import java.util.*;
import sun.reflect.misc.ReflectUtil;
import sun.swing.SwingUtilities2;

NumberFormatter subclasses InternationalFormatter
adding special behavior for numbers. Among the specializations are
(these are only used if the NumberFormatter does not display
invalid numbers, for example, setAllowsInvalid(false)):

  
Pressing +/- (- is determined from the
      DecimalFormatSymbols associated with the
      DecimalFormat) in any field but the exponent
      field will attempt to change the sign of the number to
      positive/negative.
  
Pressing +/- (- is determined from the
      DecimalFormatSymbols associated with the
      DecimalFormat) in the exponent field will
      attempt to change the sign of the exponent to positive/negative.


If you are displaying scientific numbers, you may wish to turn on
overwrite mode, setOverwriteMode(true). For example:
DecimalFormat decimalFormat = new DecimalFormat("0.000E0");
NumberFormatter textFormatter = new NumberFormatter(decimalFormat);
textFormatter.setOverwriteMode(true);
textFormatter.setAllowsInvalid(false);


If you are going to allow the user to enter decimal
values, you should either force the DecimalFormat to contain at least
one decimal (#.0###), or allow the value to be invalid
setAllowsInvalid(true). Otherwise users may not be able to
input decimal values.

NumberFormatter provides slightly different behavior to
stringToValue than that of its superclass. If you have specified a Class for values, DefaultFormatter.setValueClass, that is one of of Integer, Long, Float,
Double, Byte or Short and
the Format's parseObject returns an instance of
Number, the corresponding instance of the value class
will be created using the constructor appropriate for the primitive
type the value class represents. For example:
setValueClass(Integer.class) will cause the resulting
value to be created via
Integer.valueOf(((Number)formatter.parseObject(string)).intValue()).
This is typically useful if you
wish to set a min/max value as the various Number
implementations are generally not comparable to each other. This is also
useful if for some reason you need a specific Number
implementation for your values.

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 java.beans package. Please see XMLEncoder. 
Since:
1.4/**
 * <code>NumberFormatter</code> subclasses <code>InternationalFormatter</code>
 * adding special behavior for numbers. Among the specializations are
 * (these are only used if the <code>NumberFormatter</code> does not display
 * invalid numbers, for example, <code>setAllowsInvalid(false)</code>):
 * <ul>
 *   <li>Pressing +/- (- is determined from the
 *       <code>DecimalFormatSymbols</code> associated with the
 *       <code>DecimalFormat</code>) in any field but the exponent
 *       field will attempt to change the sign of the number to
 *       positive/negative.
 *   <li>Pressing +/- (- is determined from the
 *       <code>DecimalFormatSymbols</code> associated with the
 *       <code>DecimalFormat</code>) in the exponent field will
 *       attempt to change the sign of the exponent to positive/negative.
 * </ul>
 * <p>
 * If you are displaying scientific numbers, you may wish to turn on
 * overwrite mode, <code>setOverwriteMode(true)</code>. For example:
 * <pre>
 * DecimalFormat decimalFormat = new DecimalFormat("0.000E0");
 * NumberFormatter textFormatter = new NumberFormatter(decimalFormat);
 * textFormatter.setOverwriteMode(true);
 * textFormatter.setAllowsInvalid(false);
 * </pre>
 * <p>
 * If you are going to allow the user to enter decimal
 * values, you should either force the DecimalFormat to contain at least
 * one decimal (<code>#.0###</code>), or allow the value to be invalid
 * <code>setAllowsInvalid(true)</code>. Otherwise users may not be able to
 * input decimal values.
 * <p>
 * <code>NumberFormatter</code> provides slightly different behavior to
 * <code>stringToValue</code> than that of its superclass. If you have
 * specified a Class for values, {@link #setValueClass}, that is one of
 * of <code>Integer</code>, <code>Long</code>, <code>Float</code>,
 * <code>Double</code>, <code>Byte</code> or <code>Short</code> and
 * the Format's <code>parseObject</code> returns an instance of
 * <code>Number</code>, the corresponding instance of the value class
 * will be created using the constructor appropriate for the primitive
 * type the value class represents. For example:
 * <code>setValueClass(Integer.class)</code> will cause the resulting
 * value to be created via
 * <code>Integer.valueOf(((Number)formatter.parseObject(string)).intValue())</code>.
 * This is typically useful if you
 * wish to set a min/max value as the various <code>Number</code>
 * implementations are generally not comparable to each other. This is also
 * useful if for some reason you need a specific <code>Number</code>
 * implementation for your values.
 * <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
 */
@SuppressWarnings("serial") // Same-version serialization only
public class NumberFormatter extends InternationalFormatter {
    
The special characters from the Format instance. /** The special characters from the Format instance. */
    private String specialChars;

    
Creates a NumberFormatter with the a default
NumberFormat instance obtained from
NumberFormat.getNumberInstance().
/**
     * Creates a <code>NumberFormatter</code> with the a default
     * <code>NumberFormat</code> instance obtained from
     * <code>NumberFormat.getNumberInstance()</code>.
     */
    public NumberFormatter() {
        this(NumberFormat.getNumberInstance());
    }

    
Creates a NumberFormatter with the specified Format instance.
Params:
format – Format used to dictate legal values/**
     * Creates a NumberFormatter with the specified Format instance.
     *
     * @param format Format used to dictate legal values
     */
    public NumberFormatter(NumberFormat format) {
        super(format);
        setFormat(format);
        setAllowsInvalid(true);
        setCommitsOnValidEdit(false);
        setOverwriteMode(false);
    }

    
Sets the format that dictates the legal values that can be edited
and displayed.

If you have used the nullary constructor the value of this property
will be determined for the current locale by way of the
NumberFormat.getNumberInstance() method.
Params:
format – NumberFormat instance used to dictate legal values/**
     * Sets the format that dictates the legal values that can be edited
     * and displayed.
     * <p>
     * If you have used the nullary constructor the value of this property
     * will be determined for the current locale by way of the
     * <code>NumberFormat.getNumberInstance()</code> method.
     *
     * @param format NumberFormat instance used to dictate legal values
     */
    public void setFormat(Format format) {
        super.setFormat(format);

        DecimalFormatSymbols dfs = getDecimalFormatSymbols();

        if (dfs != null) {
            StringBuilder sb = new StringBuilder();

            sb.append(dfs.getCurrencySymbol());
            sb.append(dfs.getDecimalSeparator());
            sb.append(dfs.getGroupingSeparator());
            sb.append(dfs.getInfinity());
            sb.append(dfs.getInternationalCurrencySymbol());
            sb.append(dfs.getMinusSign());
            sb.append(dfs.getMonetaryDecimalSeparator());
            sb.append(dfs.getNaN());
            sb.append(dfs.getPercent());
            sb.append('+');
            specialChars = sb.toString();
        }
        else {
            specialChars = "";
        }
    }

    
Invokes parseObject on f, returning
its value.
/**
     * Invokes <code>parseObject</code> on <code>f</code>, returning
     * its value.
     */
    Object stringToValue(String text, Format f) throws ParseException {
        if (f == null) {
            return text;
        }
        Object value = f.parseObject(text);

        return convertValueToValueClass(value, getValueClass());
    }

    
Converts the passed in value to the passed in class. This only
works if valueClass is one of Integer,
Long, Float, Double,
Byte or Short and value
is an instanceof Number.
/**
     * Converts the passed in value to the passed in class. This only
     * works if <code>valueClass</code> is one of <code>Integer</code>,
     * <code>Long</code>, <code>Float</code>, <code>Double</code>,
     * <code>Byte</code> or <code>Short</code> and <code>value</code>
     * is an instanceof <code>Number</code>.
     */
    private Object convertValueToValueClass(Object value,
                                            Class<?> valueClass) {
        if (valueClass != null && (value instanceof Number)) {
            Number numberValue = (Number)value;
            if (valueClass == Integer.class) {
                return Integer.valueOf(numberValue.intValue());
            }
            else if (valueClass == Long.class) {
                return Long.valueOf(numberValue.longValue());
            }
            else if (valueClass == Float.class) {
                return Float.valueOf(numberValue.floatValue());
            }
            else if (valueClass == Double.class) {
                return Double.valueOf(numberValue.doubleValue());
            }
            else if (valueClass == Byte.class) {
                return Byte.valueOf(numberValue.byteValue());
            }
            else if (valueClass == Short.class) {
                return Short.valueOf(numberValue.shortValue());
            }
        }
        return value;
    }

    
Returns the character that is used to toggle to positive values.
/**
     * Returns the character that is used to toggle to positive values.
     */
    private char getPositiveSign() {
        return '+';
    }

    
Returns the character that is used to toggle to negative values.
/**
     * Returns the character that is used to toggle to negative values.
     */
    private char getMinusSign() {
        DecimalFormatSymbols dfs = getDecimalFormatSymbols();

        if (dfs != null) {
            return dfs.getMinusSign();
        }
        return '-';
    }

    
Returns the character that is used to toggle to negative values.
/**
     * Returns the character that is used to toggle to negative values.
     */
    private char getDecimalSeparator() {
        DecimalFormatSymbols dfs = getDecimalFormatSymbols();

        if (dfs != null) {
            return dfs.getDecimalSeparator();
        }
        return '.';
    }

    
Returns the DecimalFormatSymbols from the Format instance.
/**
     * Returns the DecimalFormatSymbols from the Format instance.
     */
    private DecimalFormatSymbols getDecimalFormatSymbols() {
        Format f = getFormat();

        if (f instanceof DecimalFormat) {
            return ((DecimalFormat)f).getDecimalFormatSymbols();
        }
        return null;
    }

    
Subclassed to return false if text contains in an invalid
character to insert, that is, it is not a digit
(Character.isDigit()) and
not one of the characters defined by the DecimalFormatSymbols.
/**
     * Subclassed to return false if <code>text</code> contains in an invalid
     * character to insert, that is, it is not a digit
     * (<code>Character.isDigit()</code>) and
     * not one of the characters defined by the DecimalFormatSymbols.
     */
    boolean isLegalInsertText(String text) {
        if (getAllowsInvalid()) {
            return true;
        }
        for (int counter = text.length() - 1; counter >= 0; counter--) {
            char aChar = text.charAt(counter);

            if (!Character.isDigit(aChar) &&
                           specialChars.indexOf(aChar) == -1){
                return false;
            }
        }
        return true;
    }

    
Subclassed to treat the decimal separator, grouping separator,
exponent symbol, percent, permille, currency and sign as literals.
/**
     * Subclassed to treat the decimal separator, grouping separator,
     * exponent symbol, percent, permille, currency and sign as literals.
     */
    boolean isLiteral(Map<?, ?> attrs) {
        if (!super.isLiteral(attrs)) {
            if (attrs == null) {
                return false;
            }
            int size = attrs.size();

            if (attrs.get(NumberFormat.Field.GROUPING_SEPARATOR) != null) {
                size--;
                if (attrs.get(NumberFormat.Field.INTEGER) != null) {
                    size--;
                }
            }
            if (attrs.get(NumberFormat.Field.EXPONENT_SYMBOL) != null) {
                size--;
            }
            if (attrs.get(NumberFormat.Field.PERCENT) != null) {
                size--;
            }
            if (attrs.get(NumberFormat.Field.PERMILLE) != null) {
                size--;
            }
            if (attrs.get(NumberFormat.Field.CURRENCY) != null) {
                size--;
            }
            if (attrs.get(NumberFormat.Field.SIGN) != null) {
                size--;
            }
            return size == 0;
        }
        return true;
    }

    
Subclassed to make the decimal separator navigable, as well
as making the character between the integer field and the next
field navigable.
/**
     * Subclassed to make the decimal separator navigable, as well
     * as making the character between the integer field and the next
     * field navigable.
     */
    boolean isNavigatable(int index) {
        if (!super.isNavigatable(index)) {
            // Don't skip the decimal, it causes wierd behavior
            return getBufferedChar(index) == getDecimalSeparator();
        }
        return true;
    }

    
Returns the first NumberFormat.Field starting
index incrementing by direction.
/**
     * Returns the first <code>NumberFormat.Field</code> starting
     * <code>index</code> incrementing by <code>direction</code>.
     */
    private NumberFormat.Field getFieldFrom(int index, int direction) {
        if (isValidMask()) {
            int max = getFormattedTextField().getDocument().getLength();
            AttributedCharacterIterator iterator = getIterator();

            if (index >= max) {
                index += direction;
            }
            while (index >= 0 && index < max) {
                iterator.setIndex(index);

                Map<?,?> attrs = iterator.getAttributes();

                if (attrs != null && attrs.size() > 0) {
                    for (Object key : attrs.keySet()) {
                        if (key instanceof NumberFormat.Field) {
                            return (NumberFormat.Field)key;
                        }
                    }
                }
                index += direction;
            }
        }
        return null;
    }

    
Overriden to toggle the value if the positive/minus sign
is inserted.
/**
     * Overriden to toggle the value if the positive/minus sign
     * is inserted.
     */
    void replace(DocumentFilter.FilterBypass fb, int offset, int length,
                String string, AttributeSet attr) throws BadLocationException {
        if (!getAllowsInvalid() && length == 0 && string != null &&
            string.length() == 1 &&
            toggleSignIfNecessary(fb, offset, string.charAt(0))) {
            return;
        }
        super.replace(fb, offset, length, string, attr);
    }

    
Will change the sign of the integer or exponent field if
aChar is the positive or minus sign. Returns
true if a sign change was attempted.
/**
     * Will change the sign of the integer or exponent field if
     * <code>aChar</code> is the positive or minus sign. Returns
     * true if a sign change was attempted.
     */
    private boolean toggleSignIfNecessary(DocumentFilter.FilterBypass fb,
                                              int offset, char aChar) throws
                              BadLocationException {
        if (aChar == getMinusSign() || aChar == getPositiveSign()) {
            NumberFormat.Field field = getFieldFrom(offset, -1);
            Object newValue;

            try {
                if (field == null ||
                    (field != NumberFormat.Field.EXPONENT &&
                     field != NumberFormat.Field.EXPONENT_SYMBOL &&
                     field != NumberFormat.Field.EXPONENT_SIGN)) {
                    newValue = toggleSign((aChar == getPositiveSign()));
                }
                else {
                    // exponent
                    newValue = toggleExponentSign(offset, aChar);
                }
                if (newValue != null && isValidValue(newValue, false)) {
                    int lc = getLiteralCountTo(offset);
                    String string = valueToString(newValue);

                    fb.remove(0, fb.getDocument().getLength());
                    fb.insertString(0, string, null);
                    updateValue(newValue);
                    repositionCursor(getLiteralCountTo(offset) -
                                     lc + offset, 1);
                    return true;
                }
            } catch (ParseException pe) {
                invalidEdit();
            }
        }
        return false;
    }

    
Invoked to toggle the sign. For this to work the value class
must have a single arg constructor that takes a String.
/**
     * Invoked to toggle the sign. For this to work the value class
     * must have a single arg constructor that takes a String.
     */
    private Object toggleSign(boolean positive) throws ParseException {
        Object value = stringToValue(getFormattedTextField().getText());

        if (value != null) {
            // toString isn't localized, so that using +/- should work
            // correctly.
            String string = value.toString();

            if (string != null && string.length() > 0) {
                if (positive) {
                    if (string.charAt(0) == '-') {
                        string = string.substring(1);
                    }
                }
                else {
                    if (string.charAt(0) == '+') {
                        string = string.substring(1);
                    }
                    if (string.length() > 0 && string.charAt(0) != '-') {
                        string = "-" + string;
                    }
                }
                if (string != null) {
                    Class<?> valueClass = getValueClass();

                    if (valueClass == null) {
                        valueClass = value.getClass();
                    }
                    try {
                        ReflectUtil.checkPackageAccess(valueClass);
                        SwingUtilities2.checkAccess(valueClass.getModifiers());
                        Constructor<?> cons = valueClass.getConstructor(
                                              new Class<?>[] { String.class });
                        if (cons != null) {
                            SwingUtilities2.checkAccess(cons.getModifiers());
                            return cons.newInstance(new Object[]{string});
                        }
                    } catch (Throwable ex) { }
                }
            }
        }
        return null;
    }

    
Invoked to toggle the sign of the exponent (for scientific
numbers).
/**
     * Invoked to toggle the sign of the exponent (for scientific
     * numbers).
     */
    private Object toggleExponentSign(int offset, char aChar) throws
                             BadLocationException, ParseException {
        String string = getFormattedTextField().getText();
        int replaceLength = 0;
        int loc = getAttributeStart(NumberFormat.Field.EXPONENT_SIGN);

        if (loc >= 0) {
            replaceLength = 1;
            offset = loc;
        }
        if (aChar == getPositiveSign()) {
            string = getReplaceString(offset, replaceLength, null);
        }
        else {
            string = getReplaceString(offset, replaceLength,
                                      new String(new char[] { aChar }));
        }
        return stringToValue(string);
    }
}