java/16 : java.desktop/javax/swing/text/InternationalFormatter.java

InternationalFormatter
https://openjdk.java.net/
GPLv2 + Classpath Exception
/*
 * Copyright (c) 2000, 2014, 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.awt.event.ActionEvent;
import java.io.*;
import java.text.*;
import java.text.AttributedCharacterIterator.Attribute;
import java.util.*;
import javax.swing.*;

InternationalFormatter extends DefaultFormatter,
using an instance of java.text.Format to handle the
conversion to a String, and the conversion from a String.

If getAllowsInvalid() is false, this will ask the
Format to format the current text on every edit.

You can specify a minimum and maximum value by way of the
setMinimum and setMaximum methods. In order
for this to work the values returned from stringToValue must be
comparable to the min/max values by way of the Comparable
interface.

Be careful how you configure the Format and the
InternationalFormatter, as it is possible to create a
situation where certain values can not be input. Consider the date
format 'M/d/yy', an InternationalFormatter that is always
valid (setAllowsInvalid(false)), is in overwrite mode
(setOverwriteMode(true)) and the date 7/1/99. In this
case the user will not be able to enter a two digit month or day of
month. To avoid this, the format should be 'MM/dd/yy'.

If InternationalFormatter is configured to only allow valid
values (setAllowsInvalid(false)), every valid edit will result
in the text of the JFormattedTextField being completely reset
from the Format.
The cursor position will also be adjusted as literal characters are
added/removed from the resulting String.

InternationalFormatter's behavior of
stringToValue is  slightly different than that of
DefaultTextFormatter, it does the following:

  parseObject is invoked on the Format
      specified by setFormat
  
If a Class has been set for the values (setValueClass),
      supers implementation is invoked to convert the value returned
      from parseObject to the appropriate class.
  
If a ParseException has not been thrown, and the value
      is outside the min/max a ParseException is thrown.
  
The value is returned.

InternationalFormatter implements stringToValue
in this manner so that you can specify an alternate Class than
Format may return.

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. 
See Also: Format
Comparable
Since: 1.4/**
 * <code>InternationalFormatter</code> extends <code>DefaultFormatter</code>,
 * using an instance of <code>java.text.Format</code> to handle the
 * conversion to a String, and the conversion from a String.
 * <p>
 * If <code>getAllowsInvalid()</code> is false, this will ask the
 * <code>Format</code> to format the current text on every edit.
 * <p>
 * You can specify a minimum and maximum value by way of the
 * <code>setMinimum</code> and <code>setMaximum</code> methods. In order
 * for this to work the values returned from <code>stringToValue</code> must be
 * comparable to the min/max values by way of the <code>Comparable</code>
 * interface.
 * <p>
 * Be careful how you configure the <code>Format</code> and the
 * <code>InternationalFormatter</code>, as it is possible to create a
 * situation where certain values can not be input. Consider the date
 * format 'M/d/yy', an <code>InternationalFormatter</code> that is always
 * valid (<code>setAllowsInvalid(false)</code>), is in overwrite mode
 * (<code>setOverwriteMode(true)</code>) and the date 7/1/99. In this
 * case the user will not be able to enter a two digit month or day of
 * month. To avoid this, the format should be 'MM/dd/yy'.
 * <p>
 * If <code>InternationalFormatter</code> is configured to only allow valid
 * values (<code>setAllowsInvalid(false)</code>), every valid edit will result
 * in the text of the <code>JFormattedTextField</code> being completely reset
 * from the <code>Format</code>.
 * The cursor position will also be adjusted as literal characters are
 * added/removed from the resulting String.
 * <p>
 * <code>InternationalFormatter</code>'s behavior of
 * <code>stringToValue</code> is  slightly different than that of
 * <code>DefaultTextFormatter</code>, it does the following:
 * <ol>
 *   <li><code>parseObject</code> is invoked on the <code>Format</code>
 *       specified by <code>setFormat</code>
 *   <li>If a Class has been set for the values (<code>setValueClass</code>),
 *       supers implementation is invoked to convert the value returned
 *       from <code>parseObject</code> to the appropriate class.
 *   <li>If a <code>ParseException</code> has not been thrown, and the value
 *       is outside the min/max a <code>ParseException</code> is thrown.
 *   <li>The value is returned.
 * </ol>
 * <code>InternationalFormatter</code> implements <code>stringToValue</code>
 * in this manner so that you can specify an alternate Class than
 * <code>Format</code> may return.
 * <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}.
 *
 * @see java.text.Format
 * @see java.lang.Comparable
 *
 * @since 1.4
 */
@SuppressWarnings("serial") // Same-version serialization only
public class InternationalFormatter extends DefaultFormatter {
    Used by getFields.
/**
     * Used by <code>getFields</code>.
     */
    private static final Format.Field[] EMPTY_FIELD_ARRAY =new Format.Field[0];

    Object used to handle the conversion.
/**
     * Object used to handle the conversion.
     */
    private Format format;
    Can be used to impose a maximum value.
/**
     * Can be used to impose a maximum value.
     */
    private Comparable<?> max;
    Can be used to impose a minimum value.
/**
     * Can be used to impose a minimum value.
     */
    private Comparable<?> min;

    /**
     * <code>InternationalFormatter</code>'s behavior is dicatated by a
     * <code>AttributedCharacterIterator</code> that is obtained from
     * the <code>Format</code>. On every edit, assuming
     * allows invalid is false, the <code>Format</code> instance is invoked
     * with <code>formatToCharacterIterator</code>. A <code>BitSet</code> is
     * also kept upto date with the non-literal characters, that is
     * for every index in the <code>AttributedCharacterIterator</code> an
     * entry in the bit set is updated based on the return value from
     * <code>isLiteral(Map)</code>. <code>isLiteral(int)</code> then uses
     * this cached information.
     * <p>
     * If allowsInvalid is false, every edit results in resetting the complete
     * text of the JTextComponent.
     * <p>
     * InternationalFormatterFilter can also provide two actions suitable for
     * incrementing and decrementing. To enable this a subclass must
     * override <code>getSupportsIncrement</code> to return true, and
     * override <code>adjustValue</code> to handle the changing of the
     * value. If you want to support changing the value outside of
     * the valid FieldPositions, you will need to override
     * <code>canIncrement</code>.
     */
    A bit is set for every index identified in the
AttributedCharacterIterator that is not considered decoration.
This should only be used if validMask is true.
/**
     * A bit is set for every index identified in the
     * AttributedCharacterIterator that is not considered decoration.
     * This should only be used if validMask is true.
     */
    private transient BitSet literalMask;
    Used to iterate over characters.
/**
     * Used to iterate over characters.
     */
    private transient AttributedCharacterIterator iterator;
    True if the Format was able to convert the value to a String and
back.
/**
     * True if the Format was able to convert the value to a String and
     * back.
     */
    private transient boolean validMask;
    Current value being displayed.
/**
     * Current value being displayed.
     */
    private transient String string;
    If true, DocumentFilter methods are unconditionally allowed,
and no checking is done on their values. This is used when
incrementing/decrementing via the actions.
/**
     * If true, DocumentFilter methods are unconditionally allowed,
     * and no checking is done on their values. This is used when
     * incrementing/decrementing via the actions.
     */
    private transient boolean ignoreDocumentMutate;


    Creates an InternationalFormatter with no
Format specified.
/**
     * Creates an <code>InternationalFormatter</code> with no
     * <code>Format</code> specified.
     */
    public InternationalFormatter() {
        setOverwriteMode(false);
    }

    Creates an InternationalFormatter with the specified
Format instance.
Params: format – Format instance used for converting from/to Strings/**
     * Creates an <code>InternationalFormatter</code> with the specified
     * <code>Format</code> instance.
     *
     * @param format Format instance used for converting from/to Strings
     */
    public InternationalFormatter(Format format) {
        this();
        setFormat(format);
    }

    Sets the format that dictates the legal values that can be edited
and displayed.
Params: format – Format instance used for converting
from/to Strings/**
     * Sets the format that dictates the legal values that can be edited
     * and displayed.
     *
     * @param format <code>Format</code> instance used for converting
     * from/to Strings
     */
    public void setFormat(Format format) {
        this.format = format;
    }

    Returns the format that dictates the legal values that can be edited
and displayed.
Returns: Format instance used for converting from/to Strings/**
     * Returns the format that dictates the legal values that can be edited
     * and displayed.
     *
     * @return Format instance used for converting from/to Strings
     */
    public Format getFormat() {
        return format;
    }

    Sets the minimum permissible value. If the valueClass has
not been specified, and minimum is non null, the
valueClass will be set to that of the class of
minimum.
Params: minimum – Minimum legal value that can be input
See Also: DefaultFormatter.setValueClass/**
     * Sets the minimum permissible value. If the <code>valueClass</code> has
     * not been specified, and <code>minimum</code> is non null, the
     * <code>valueClass</code> will be set to that of the class of
     * <code>minimum</code>.
     *
     * @param minimum Minimum legal value that can be input
     * @see #setValueClass
     */
    public void setMinimum(Comparable<?> minimum) {
        if (getValueClass() == null && minimum != null) {
            setValueClass(minimum.getClass());
        }
        min = minimum;
    }

    Returns the minimum permissible value.
Returns: Minimum legal value that can be input/**
     * Returns the minimum permissible value.
     *
     * @return Minimum legal value that can be input
     */
    public Comparable<?> getMinimum() {
        return min;
    }

    Sets the maximum permissible value. If the valueClass has
not been specified, and max is non null, the
valueClass will be set to that of the class of
max.
Params: max – Maximum legal value that can be input
See Also: DefaultFormatter.setValueClass/**
     * Sets the maximum permissible value. If the <code>valueClass</code> has
     * not been specified, and <code>max</code> is non null, the
     * <code>valueClass</code> will be set to that of the class of
     * <code>max</code>.
     *
     * @param max Maximum legal value that can be input
     * @see #setValueClass
     */
    public void setMaximum(Comparable<?> max) {
        if (getValueClass() == null && max != null) {
            setValueClass(max.getClass());
        }
        this.max = max;
    }

    Returns the maximum permissible value.
Returns: Maximum legal value that can be input/**
     * Returns the maximum permissible value.
     *
     * @return Maximum legal value that can be input
     */
    public Comparable<?> getMaximum() {
        return max;
    }

    Installs the DefaultFormatter onto a particular
JFormattedTextField.
This will invoke valueToString to convert the
current value from the JFormattedTextField to
a String. This will then install the Actions from
getActions, the DocumentFilter
returned from getDocumentFilter and the
NavigationFilter returned from
getNavigationFilter onto the
JFormattedTextField.

Subclasses will typically only need to override this if they
wish to install additional listeners on the
JFormattedTextField.

If there is a ParseException in converting the
current value to a String, this will set the text to an empty
String, and mark the JFormattedTextField as being
in an invalid state.

While this is a public method, this is typically only useful
for subclassers of JFormattedTextField.
JFormattedTextField will invoke this method at
the appropriate times when the value changes, or its internal
state changes.
Params: ftf – JFormattedTextField to format for, may be null indicating
           uninstall from current JFormattedTextField./**
     * 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);
        updateMaskIfNecessary();
        // invoked again as the mask should now be valid.
        positionCursorAtInitialLocation();
    }

    Returns a String representation of the Object value.
This invokes format on the current Format.
Params: value – Value to convert
Throws: ParseException – if there is an error in the conversion
Returns: String representation of value/**
     * Returns a String representation of the Object <code>value</code>.
     * This invokes <code>format</code> on the current <code>Format</code>.
     *
     * @throws ParseException if there is an error in the conversion
     * @param value Value to convert
     * @return String representation of value
     */
    public String valueToString(Object value) throws ParseException {
        if (value == null) {
            return "";
        }
        Format f = getFormat();

        if (f == null) {
            return value.toString();
        }
        return f.format(value);
    }

    Returns the Object representation of the
String text.
Params: text – String to convert
Throws: ParseException – if there is an error in the conversion
Returns: Object representation of text/**
     * Returns the <code>Object</code> representation of the
     * <code>String</code> <code>text</code>.
     *
     * @param text <code>String</code> to convert
     * @return <code>Object</code> representation of text
     * @throws ParseException if there is an error in the conversion
     */
    public Object stringToValue(String text) throws ParseException {
        Object value = stringToValue(text, getFormat());

        // Convert to the value class if the Value returned from the
        // Format does not match.
        if (value != null && getValueClass() != null &&
                             !getValueClass().isInstance(value)) {
            value = super.stringToValue(value.toString());
        }
        try {
            if (!isValidValue(value, true)) {
                throw new ParseException("Value not within min/max range", 0);
            }
        } catch (ClassCastException cce) {
            throw new ParseException("Class cast exception comparing values: "
                                     + cce, 0);
        }
        return value;
    }

    Returns the Format.Field constants associated with
the text at offset. If offset is not
a valid location into the current text, this will return an
empty array.
Params: offset – offset into text to be examined
Returns: Format.Field constants associated with the text at the
        given position./**
     * Returns the <code>Format.Field</code> constants associated with
     * the text at <code>offset</code>. If <code>offset</code> is not
     * a valid location into the current text, this will return an
     * empty array.
     *
     * @param offset offset into text to be examined
     * @return Format.Field constants associated with the text at the
     *         given position.
     */
    public Format.Field[] getFields(int offset) {
        if (getAllowsInvalid()) {
            // This will work if the currently edited value is valid.
            updateMask();
        }

        Map<Attribute, Object> attrs = getAttributes(offset);

        if (attrs != null && attrs.size() > 0) {
            ArrayList<Attribute> al = new ArrayList<Attribute>();

            al.addAll(attrs.keySet());
            return al.toArray(EMPTY_FIELD_ARRAY);
        }
        return EMPTY_FIELD_ARRAY;
    }

    Creates a copy of the DefaultFormatter.
Returns: copy of the DefaultFormatter/**
     * Creates a copy of the DefaultFormatter.
     *
     * @return copy of the DefaultFormatter
     */
    public Object clone() throws CloneNotSupportedException {
        InternationalFormatter formatter = (InternationalFormatter)super.
                                           clone();

        formatter.literalMask = null;
        formatter.iterator = null;
        formatter.validMask = false;
        formatter.string = null;
        return formatter;
    }

    If getSupportsIncrement returns true, this returns
two Actions suitable for incrementing/decrementing the value.
/**
     * If <code>getSupportsIncrement</code> returns true, this returns
     * two Actions suitable for incrementing/decrementing the value.
     */
    protected Action[] getActions() {
        if (getSupportsIncrement()) {
            return new Action[] { new IncrementAction("increment", 1),
                                  new IncrementAction("decrement", -1) };
        }
        return null;
    }

    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;
        }
        return f.parseObject(text);
    }

    Returns true if value is between the min/max.
Params: wantsCCE – If false, and a ClassCastException is thrown in
                comparing the values, the exception is consumed and
                false is returned./**
     * Returns true if <code>value</code> is between the min/max.
     *
     * @param wantsCCE If false, and a ClassCastException is thrown in
     *                 comparing the values, the exception is consumed and
     *                 false is returned.
     */
    boolean isValidValue(Object value, boolean wantsCCE) {
        @SuppressWarnings("unchecked")
        Comparable<Object> min = (Comparable<Object>)getMinimum();

        try {
            if (min != null && min.compareTo(value) > 0) {
                return false;
            }
        } catch (ClassCastException cce) {
            if (wantsCCE) {
                throw cce;
            }
            return false;
        }

        @SuppressWarnings("unchecked")
        Comparable<Object> max = (Comparable<Object>)getMaximum();
        try {
            if (max != null && max.compareTo(value) < 0) {
                return false;
            }
        } catch (ClassCastException cce) {
            if (wantsCCE) {
                throw cce;
            }
            return false;
        }
        return true;
    }

    Returns a Set of the attribute identifiers at index.
/**
     * Returns a Set of the attribute identifiers at <code>index</code>.
     */
    Map<Attribute, Object> getAttributes(int index) {
        if (isValidMask()) {
            AttributedCharacterIterator iterator = getIterator();

            if (index >= 0 && index <= iterator.getEndIndex()) {
                iterator.setIndex(index);
                return iterator.getAttributes();
            }
        }
        return null;
    }


    Returns the start of the first run that contains the attribute
id. This will return -1 if the attribute
can not be found.
/**
     * Returns the start of the first run that contains the attribute
     * <code>id</code>. This will return <code>-1</code> if the attribute
     * can not be found.
     */
    int getAttributeStart(AttributedCharacterIterator.Attribute id) {
        if (isValidMask()) {
            AttributedCharacterIterator iterator = getIterator();

            iterator.first();
            while (iterator.current() != CharacterIterator.DONE) {
                if (iterator.getAttribute(id) != null) {
                    return iterator.getIndex();
                }
                iterator.next();
            }
        }
        return -1;
    }

    Returns the AttributedCharacterIterator used to
format the last value.
/**
     * Returns the <code>AttributedCharacterIterator</code> used to
     * format the last value.
     */
    AttributedCharacterIterator getIterator() {
        return iterator;
    }

    Updates the AttributedCharacterIterator and bitset, if necessary.
/**
     * Updates the AttributedCharacterIterator and bitset, if necessary.
     */
    void updateMaskIfNecessary() {
        if (!getAllowsInvalid() && (getFormat() != null)) {
            if (!isValidMask()) {
                updateMask();
            }
            else {
                String newString = getFormattedTextField().getText();

                if (!newString.equals(string)) {
                    updateMask();
                }
            }
        }
    }

    Updates the AttributedCharacterIterator by invoking
formatToCharacterIterator on the Format.
If this is successful,
updateMask(AttributedCharacterIterator)
is then invoked to update the internal bitmask.
/**
     * Updates the AttributedCharacterIterator by invoking
     * <code>formatToCharacterIterator</code> on the <code>Format</code>.
     * If this is successful,
     * <code>updateMask(AttributedCharacterIterator)</code>
     * is then invoked to update the internal bitmask.
     */
    void updateMask() {
        if (getFormat() != null) {
            Document doc = getFormattedTextField().getDocument();

            validMask = false;
            if (doc != null) {
                try {
                    string = doc.getText(0, doc.getLength());
                } catch (BadLocationException ble) {
                    string = null;
                }
                if (string != null) {
                    try {
                        Object value = stringToValue(string);
                        AttributedCharacterIterator iterator = getFormat().
                                  formatToCharacterIterator(value);

                        updateMask(iterator);
                    }
                    catch (ParseException pe) {}
                    catch (IllegalArgumentException iae) {}
                    catch (NullPointerException npe) {}
                }
            }
        }
    }

    Returns the number of literal characters before index.
/**
     * Returns the number of literal characters before <code>index</code>.
     */
    int getLiteralCountTo(int index) {
        int lCount = 0;

        for (int counter = 0; counter < index; counter++) {
            if (isLiteral(counter)) {
                lCount++;
            }
        }
        return lCount;
    }

    Returns true if the character at index is a literal, that is
not editable.
/**
     * Returns true if the character at index is a literal, that is
     * not editable.
     */
    boolean isLiteral(int index) {
        if (isValidMask() && index < string.length()) {
            return literalMask.get(index);
        }
        return false;
    }

    Returns the literal character at index.
/**
     * Returns the literal character at index.
     */
    char getLiteral(int index) {
        if (isValidMask() && string != null && index < string.length()) {
            return string.charAt(index);
        }
        return (char)0;
    }

    Returns true if the character at offset is navigable too. This
is implemented in terms of isLiteral, subclasses
may wish to provide different behavior.
/**
     * Returns true if the character at offset is navigable too. This
     * is implemented in terms of <code>isLiteral</code>, subclasses
     * may wish to provide different behavior.
     */
    boolean isNavigatable(int offset) {
        return !isLiteral(offset);
    }

    Overriden to update the mask after invoking supers implementation.
/**
     * Overriden to update the mask after invoking supers implementation.
     */
    void updateValue(Object value) {
        super.updateValue(value);
        updateMaskIfNecessary();
    }

    Overriden to unconditionally allow the replace if
ignoreDocumentMutate is true.
/**
     * Overriden to unconditionally allow the replace if
     * ignoreDocumentMutate is true.
     */
    void replace(DocumentFilter.FilterBypass fb, int offset,
                     int length, String text,
                     AttributeSet attrs) throws BadLocationException {
        if (ignoreDocumentMutate) {
            fb.replace(offset, length, text, attrs);
            return;
        }
        super.replace(fb, offset, length, text, attrs);
    }

    Returns the index of the next non-literal character starting at
index. If index is not a literal, it will be returned.
Params: direction – Amount to increment looking for non-literal/**
     * Returns the index of the next non-literal character starting at
     * index. If index is not a literal, it will be returned.
     *
     * @param direction Amount to increment looking for non-literal
     */
    private int getNextNonliteralIndex(int index, int direction) {
        int max = getFormattedTextField().getDocument().getLength();

        while (index >= 0 && index < max) {
            if (isLiteral(index)) {
                index += direction;
            }
            else {
                return index;
            }
        }
        return (direction == -1) ? 0 : max;
    }

    Overriden in an attempt to honor the literals.
If we do not allow invalid values and are in overwrite mode, this rh.length is corrected as to preserve trailing literals. If not in overwrite mode, and there is text to insert it is inserted at the next non literal index going forward. If there is only text to remove, it is removed from the next non literal index going backward. /**
     * Overriden in an attempt to honor the literals.
     * <p>If we do not allow invalid values and are in overwrite mode, this
     * {@code rh.length} is corrected as to preserve trailing literals.
     * If not in overwrite mode, and there is text to insert it is
     * inserted at the next non literal index going forward.  If there
     * is only text to remove, it is removed from the next non literal
     * index going backward.
     */
    boolean canReplace(ReplaceHolder rh) {
        if (!getAllowsInvalid()) {
            String text = rh.text;
            int tl = (text != null) ? text.length() : 0;
            JTextComponent c = getFormattedTextField();

            if (tl == 0 && rh.length == 1 && c.getSelectionStart() != rh.offset) {
                // Backspace, adjust to actually delete next non-literal.
                rh.offset = getNextNonliteralIndex(rh.offset, -1);
            } else if (getOverwriteMode()) {
                int pos = rh.offset;
                int textPos = pos;
                boolean overflown = false;

                for (int i = 0; i < rh.length; i++) {
                    while (isLiteral(pos)) pos++;
                    if (pos >= string.length()) {
                        pos = textPos;
                        overflown = true;
                        break;
                    }
                    textPos = ++pos;
                }
                if (overflown || c.getSelectedText() == null) {
                    rh.length = pos - rh.offset;
                }
            }
            else if (tl > 0) {
                // insert (or insert and remove)
                rh.offset = getNextNonliteralIndex(rh.offset, 1);
            }
            else {
                // remove only
                rh.offset = getNextNonliteralIndex(rh.offset, -1);
            }
            ((ExtendedReplaceHolder)rh).endOffset = rh.offset;
            ((ExtendedReplaceHolder)rh).endTextLength = (rh.text != null) ?
                                                    rh.text.length() : 0;
        }
        else {
            ((ExtendedReplaceHolder)rh).endOffset = rh.offset;
            ((ExtendedReplaceHolder)rh).endTextLength = (rh.text != null) ?
                                                    rh.text.length() : 0;
        }
        boolean can = super.canReplace(rh);
        if (can && !getAllowsInvalid()) {
            ((ExtendedReplaceHolder)rh).resetFromValue(this);
        }
        return can;
    }

    When in !allowsInvalid mode the text is reset on every edit, thus
supers implementation will position the cursor at the wrong position.
As such, this invokes supers implementation and then invokes
repositionCursor to correctly reset the cursor.
/**
     * When in !allowsInvalid mode the text is reset on every edit, thus
     * supers implementation will position the cursor at the wrong position.
     * As such, this invokes supers implementation and then invokes
     * <code>repositionCursor</code> to correctly reset the cursor.
     */
    boolean replace(ReplaceHolder rh) throws BadLocationException {
        int start = -1;
        int direction = 1;
        int literalCount = -1;

        if (rh.length > 0 && (rh.text == null || rh.text.length() == 0) &&
               (getFormattedTextField().getSelectionStart() != rh.offset ||
                   rh.length > 1)) {
            direction = -1;
        }
        if (!getAllowsInvalid()) {
            if ((rh.text == null || rh.text.length() == 0) && rh.length > 0) {
                // remove
                start = getFormattedTextField().getSelectionStart();
            }
            else {
                start = rh.offset;
            }
            literalCount = getLiteralCountTo(start);
        }
        if (super.replace(rh)) {
            if (start != -1) {
                int end = ((ExtendedReplaceHolder)rh).endOffset;

                end += ((ExtendedReplaceHolder)rh).endTextLength;
                repositionCursor(literalCount, end, direction);
            }
            else {
                start = ((ExtendedReplaceHolder)rh).endOffset;
                if (direction == 1) {
                    start += ((ExtendedReplaceHolder)rh).endTextLength;
                }
                repositionCursor(start, direction);
            }
            return true;
        }
        return false;
    }

    Repositions the cursor. startLiteralCount gives
the number of literals to the start of the deleted range, end
gives the ending location to adjust from, direction gives
the direction relative to end to position the
cursor from.
/**
     * Repositions the cursor. <code>startLiteralCount</code> gives
     * the number of literals to the start of the deleted range, end
     * gives the ending location to adjust from, direction gives
     * the direction relative to <code>end</code> to position the
     * cursor from.
     */
    private void repositionCursor(int startLiteralCount, int end,
                                  int direction)  {
        int endLiteralCount = getLiteralCountTo(end);

        if (endLiteralCount != end) {
            end -= startLiteralCount;
            for (int counter = 0; counter < end; counter++) {
                if (isLiteral(counter)) {
                    end++;
                }
            }
        }
        repositionCursor(end, 1 /*direction*/);
    }

    Returns the character from the mask that has been buffered
at index.
/**
     * Returns the character from the mask that has been buffered
     * at <code>index</code>.
     */
    char getBufferedChar(int index) {
        if (isValidMask()) {
            if (string != null && index < string.length()) {
                return string.charAt(index);
            }
        }
        return (char)0;
    }

    Returns true if the current mask is valid.
/**
     * Returns true if the current mask is valid.
     */
    boolean isValidMask() {
        return validMask;
    }

    Returns true if attributes is null or empty.
/**
     * Returns true if <code>attributes</code> is null or empty.
     */
    boolean isLiteral(Map<?, ?> attributes) {
        return ((attributes == null) || attributes.size() == 0);
    }

    Updates the interal bitset from iterator. This will
set validMask to true if iterator is
non-null.
/**
     * Updates the interal bitset from <code>iterator</code>. This will
     * set <code>validMask</code> to true if <code>iterator</code> is
     * non-null.
     */
    private void updateMask(AttributedCharacterIterator iterator) {
        if (iterator != null) {
            validMask = true;
            this.iterator = iterator;

            // Update the literal mask
            if (literalMask == null) {
                literalMask = new BitSet();
            }
            else {
                for (int counter = literalMask.length() - 1; counter >= 0;
                     counter--) {
                    literalMask.clear(counter);
                }
            }

            iterator.first();
            while (iterator.current() != CharacterIterator.DONE) {
                Map<Attribute,Object> attributes = iterator.getAttributes();
                boolean set = isLiteral(attributes);
                int start = iterator.getIndex();
                int end = iterator.getRunLimit();

                while (start < end) {
                    if (set) {
                        literalMask.set(start);
                    }
                    else {
                        literalMask.clear(start);
                    }
                    start++;
                }
                iterator.setIndex(start);
            }
        }
    }

    Returns true if field is non-null.
Subclasses that wish to allow incrementing to happen outside of
the known fields will need to override this.
/**
     * Returns true if <code>field</code> is non-null.
     * Subclasses that wish to allow incrementing to happen outside of
     * the known fields will need to override this.
     */
    boolean canIncrement(Object field, int cursorPosition) {
        return (field != null);
    }

    Selects the fields identified by attributes.
/**
     * Selects the fields identified by <code>attributes</code>.
     */
    void selectField(Object f, int count) {
        AttributedCharacterIterator iterator = getIterator();

        if (iterator != null &&
                        (f instanceof AttributedCharacterIterator.Attribute)) {
            AttributedCharacterIterator.Attribute field =
                                   (AttributedCharacterIterator.Attribute)f;

            iterator.first();
            while (iterator.current() != CharacterIterator.DONE) {
                while (iterator.getAttribute(field) == null &&
                       iterator.next() != CharacterIterator.DONE);
                if (iterator.current() != CharacterIterator.DONE) {
                    int limit = iterator.getRunLimit(field);

                    if (--count <= 0) {
                        getFormattedTextField().select(iterator.getIndex(),
                                                       limit);
                        break;
                    }
                    iterator.setIndex(limit);
                    iterator.next();
                }
            }
        }
    }

    Returns the field that will be adjusted by adjustValue.
/**
     * Returns the field that will be adjusted by adjustValue.
     */
    Object getAdjustField(int start, Map<?, ?> attributes) {
        return null;
    }

    Returns the number of occurrences of f before
the location start in the current
AttributedCharacterIterator.
/**
     * Returns the number of occurrences of <code>f</code> before
     * the location <code>start</code> in the current
     * <code>AttributedCharacterIterator</code>.
     */
    private int getFieldTypeCountTo(Object f, int start) {
        AttributedCharacterIterator iterator = getIterator();
        int count = 0;

        if (iterator != null &&
                    (f instanceof AttributedCharacterIterator.Attribute)) {
            AttributedCharacterIterator.Attribute field =
                                   (AttributedCharacterIterator.Attribute)f;

            iterator.first();
            while (iterator.getIndex() < start) {
                while (iterator.getAttribute(field) == null &&
                       iterator.next() != CharacterIterator.DONE);
                if (iterator.current() != CharacterIterator.DONE) {
                    iterator.setIndex(iterator.getRunLimit(field));
                    iterator.next();
                    count++;
                }
                else {
                    break;
                }
            }
        }
        return count;
    }

    Subclasses supporting incrementing must override this to handle
the actual incrementing. value is the current value,
attributes gives the field the cursor is in (may be
null depending upon canIncrement) and
direction is the amount to increment by.
/**
     * Subclasses supporting incrementing must override this to handle
     * the actual incrementing. <code>value</code> is the current value,
     * <code>attributes</code> gives the field the cursor is in (may be
     * null depending upon <code>canIncrement</code>) and
     * <code>direction</code> is the amount to increment by.
     */
    Object adjustValue(Object value, Map<?, ?> attributes, Object field,
                           int direction) throws
                      BadLocationException, ParseException {
        return null;
    }

    Returns false, indicating InternationalFormatter does not allow
incrementing of the value. Subclasses that wish to support
incrementing/decrementing the value should override this and
return true. Subclasses should also override
adjustValue.
/**
     * Returns false, indicating InternationalFormatter does not allow
     * incrementing of the value. Subclasses that wish to support
     * incrementing/decrementing the value should override this and
     * return true. Subclasses should also override
     * <code>adjustValue</code>.
     */
    boolean getSupportsIncrement() {
        return false;
    }

    Resets the value of the JFormattedTextField to be
value.
/**
     * Resets the value of the JFormattedTextField to be
     * <code>value</code>.
     */
    void resetValue(Object value) throws BadLocationException, ParseException {
        Document doc = getFormattedTextField().getDocument();
        String string = valueToString(value);

        try {
            ignoreDocumentMutate = true;
            doc.remove(0, doc.getLength());
            doc.insertString(0, string, null);
        } finally {
            ignoreDocumentMutate = false;
        }
        updateValue(value);
    }

    Subclassed to update the internal representation of the mask after
the default read operation has completed.
/**
     * 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();
        updateMaskIfNecessary();
    }


    Overriden to return an instance of ExtendedReplaceHolder.
/**
     * Overriden to return an instance of <code>ExtendedReplaceHolder</code>.
     */
    ReplaceHolder getReplaceHolder(DocumentFilter.FilterBypass fb, int offset,
                                   int length, String text,
                                   AttributeSet attrs) {
        if (replaceHolder == null) {
            replaceHolder = new ExtendedReplaceHolder();
        }
        return super.getReplaceHolder(fb, offset, length, text, attrs);
    }


    As InternationalFormatter replaces the complete text on every edit,
ExtendedReplaceHolder keeps track of the offset and length passed
into canReplace.
/**
     * As InternationalFormatter replaces the complete text on every edit,
     * ExtendedReplaceHolder keeps track of the offset and length passed
     * into canReplace.
     */
    static class ExtendedReplaceHolder extends ReplaceHolder {
        Offset of the insert/remove. This may differ from offset in
that if !allowsInvalid the text is replaced on every edit. /** Offset of the insert/remove. This may differ from offset in
         * that if !allowsInvalid the text is replaced on every edit. */
        int endOffset;
        Length of the text. This may differ from text.length in
that if !allowsInvalid the text is replaced on every edit. /** Length of the text. This may differ from text.length in
         * that if !allowsInvalid the text is replaced on every edit. */
        int endTextLength;

        Resets the region to delete to be the complete document and
the text from invoking valueToString on the current value.
/**
         * Resets the region to delete to be the complete document and
         * the text from invoking valueToString on the current value.
         */
        void resetFromValue(InternationalFormatter formatter) {
            // Need to reset the complete string as Format's result can
            // be completely different.
            offset = 0;
            try {
                text = formatter.valueToString(value);
            } catch (ParseException pe) {
                // Should never happen, otherwise canReplace would have
                // returned value.
                text = "";
            }
            length = fb.getDocument().getLength();
        }
    }


    IncrementAction is used to increment the value by a certain amount.
It calls into adjustValue to handle the actual
incrementing of the value.
/**
     * IncrementAction is used to increment the value by a certain amount.
     * It calls into <code>adjustValue</code> to handle the actual
     * incrementing of the value.
     */
    private class IncrementAction extends AbstractAction {
        private int direction;

        IncrementAction(String name, int direction) {
            super(name);
            this.direction = direction;
        }

        public void actionPerformed(ActionEvent ae) {

            if (getFormattedTextField().isEditable()) {
                if (getAllowsInvalid()) {
                    // This will work if the currently edited value is valid.
                    updateMask();
                }

                boolean validEdit = false;

                if (isValidMask()) {
                    int start = getFormattedTextField().getSelectionStart();

                    if (start != -1) {
                        AttributedCharacterIterator iterator = getIterator();

                        iterator.setIndex(start);

                        Map<Attribute,Object> attributes = iterator.getAttributes();
                        Object field = getAdjustField(start, attributes);

                        if (canIncrement(field, start)) {
                            try {
                                Object value = stringToValue(
                                        getFormattedTextField().getText());
                                int fieldTypeCount = getFieldTypeCountTo(
                                        field, start);

                                value = adjustValue(value, attributes,
                                        field, direction);
                                if (value != null && isValidValue(value, false)) {
                                    resetValue(value);
                                    updateMask();

                                    if (isValidMask()) {
                                        selectField(field, fieldTypeCount);
                                    }
                                    validEdit = true;
                                }
                            }
                            catch (ParseException pe) { }
                            catch (BadLocationException ble) { }
                        }
                    }
                }
                if (!validEdit) {
                    invalidEdit();
                }
            }
        }
    }
}
Params:	minimum – Minimum legal value that can be input
See Also:	DefaultFormatter.setValueClass
Params:	max – Maximum legal value that can be input
See Also:	DefaultFormatter.setValueClass
Params:	value – Value to convert
Throws:	ParseException – if there is an error in the conversion
Returns:	String representation of value
Params:	text – `String` to convert
Throws:	ParseException – if there is an error in the conversion
Returns:	`Object` representation of text
Params:	offset – offset into text to be examined
Returns:	Format.Field constants associated with the text at the given position.
/

java/ 16/ java.desktop/javax/swing/text/InternationalFormatter.java
