1 /* DefaultFormatter.java --
2 Copyright (C) 2005 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
38 package javax.swing.text;
40 import java.io.Serializable;
41 import java.lang.reflect.Constructor;
42 import java.text.ParseException;
44 import javax.swing.JFormattedTextField;
47 * The <code>DefaultFormatter</code> is a concrete formatter for use in
48 * {@link JFormattedTextField}s.
50 * It can format arbitrary values by invoking
51 * their {@link Object#toString} method.
53 * In order to convert a String back to
54 * a value, the value class must provide a single argument constructor that
55 * takes a String object as argument value. If no such constructor is found,
56 * the String itself is passed back by #stringToValue.
58 * @author Roman Kennke (roman@kennke.org)
60 public class DefaultFormatter extends JFormattedTextField.AbstractFormatter
61 implements Cloneable, Serializable
65 * A {@link DocumentFilter} that intercepts modification of the
66 * JFormattedTextField's Document and commits the value depending
67 * on the value of the <code>commitsOnValidEdit</code> property.
70 // FIXME: Handle allowsInvalid and overwriteMode properties
71 private class FormatterDocumentFilter
72 extends DocumentFilter
75 * Invoked when text is removed from a text component.
77 * @param bypass the FilterBypass to use to mutate the document
78 * @param offset the start position of the modification
79 * @param length the length of the removed text
81 * @throws BadLocationException if offset or lenght are invalid in
84 public void remove(DocumentFilter.FilterBypass bypass, int offset,
86 throws BadLocationException
88 super.remove(bypass, offset, length);
94 * Invoked when text is inserted into a text component.
96 * @param bypass the FilterBypass to use to mutate the document
97 * @param offset the start position of the modification
98 * @param text the inserted text
99 * @param attributes the attributes of the inserted text
101 * @throws BadLocationException if offset or lenght are invalid in
104 public void insertString(DocumentFilter.FilterBypass bypass, int offset,
105 String text, AttributeSet attributes)
106 throws BadLocationException
108 if (overwriteMode == true)
109 replace(bypass, offset, text.length(), text, attributes);
111 super.insertString(bypass, offset, text, attributes);
117 * Invoked when text is replaced in a text component.
119 * @param bypass the FilterBypass to use to mutate the document
120 * @param offset the start position of the modification
121 * @param length the length of the removed text
122 * @param text the inserted text
123 * @param attributes the attributes of the inserted text
125 * @throws BadLocationException if offset or lenght are invalid in
128 public void replace(DocumentFilter.FilterBypass bypass, int offset,
129 int length, String text, AttributeSet attributes)
130 throws BadLocationException
132 super.replace(bypass, offset, length, text, attributes);
138 * Commits the value to the JTextTextField if the property
139 * <code>commitsOnValidEdit</code> is set to <code>true</code>.
141 private void commitIfAllowed()
143 if (commitsOnValidEdit == true)
146 getFormattedTextField().commitEdit();
148 catch (ParseException ex)
150 // ignore invalid edits
155 * Checks if the value in the input field is valid. If the
156 * property allowsInvalid is set to <code>false</code>, then
157 * the string in the input field is not allowed to be entered.
159 private void checkValidInput()
161 JFormattedTextField ftf = getFormattedTextField();
164 Object newval = stringToValue(ftf.getText());
166 catch (ParseException ex)
170 // roll back the input if invalid edits are not allowed
173 ftf.setText(valueToString(ftf.getValue()));
175 catch (ParseException pe)
177 // if that happens, something serious must be wrong
179 ae = new AssertionError("values must be parseable");
188 /** The serialization UID (compatible with JDK1.5). */
189 private static final long serialVersionUID = -355018354457785329L;
192 * Indicates if the value should be committed after every
193 * valid modification of the Document.
195 boolean commitsOnValidEdit;
198 * If <code>true</code> newly inserted characters overwrite existing
199 * values, otherwise insertion is done the normal way.
201 boolean overwriteMode;
204 * If <code>true</code> invalid edits are allowed for a limited
207 boolean allowsInvalid;
210 * The class that is used for values.
215 * Creates a new instance of <code>DefaultFormatter</code>.
217 public DefaultFormatter()
219 commitsOnValidEdit = false;
220 overwriteMode = true;
221 allowsInvalid = true;
225 * Installs the formatter on the specified {@link JFormattedTextField}.
227 * This method does the following things:
229 * <li>Display the value of #valueToString in the
230 * <code>JFormattedTextField</code></li>
231 * <li>Install the Actions from #getActions on the <code>JTextField</code>
233 * <li>Install the DocumentFilter returned by #getDocumentFilter</li>
234 * <li>Install the NavigationFilter returned by #getNavigationFilter</li>
237 * This method is typically not overridden by subclasses. Instead override
238 * one of the mentioned methods in order to customize behaviour.
240 * @param ftf the {@link JFormattedTextField} in which this formatter
243 public void install(JFormattedTextField ftf)
249 * Returns <code>true</code> if the value should be committed after
250 * each valid modification of the input field, <code>false</code> if
251 * it should never be committed by this formatter.
253 * @return the state of the <code>commitsOnValidEdit</code> property
255 * @see #setCommitsOnValidEdit
257 public boolean getCommitsOnValidEdit()
259 return commitsOnValidEdit;
263 * Sets the value of the <code>commitsOnValidEdit</code> property.
265 * @param commitsOnValidEdit the new state of the
266 * <code>commitsOnValidEdit</code> property
268 * @see #getCommitsOnValidEdit
270 public void setCommitsOnValidEdit(boolean commitsOnValidEdit)
272 this.commitsOnValidEdit = commitsOnValidEdit;
276 * Returns the value of the <code>overwriteMode</code> property.
277 * If that is set to <code>true</code> then newly inserted characters
278 * overwrite existing values, otherwise the characters are inserted like
279 * normal. The default is <code>true</code>.
281 * @return the value of the <code>overwriteMode</code> property
283 public boolean getOverwriteMode()
285 return overwriteMode;
289 * Sets the value of the <code>overwriteMode</code> property.
291 * If that is set to <code>true</code> then newly inserted characters
292 * overwrite existing values, otherwise the characters are inserted like
293 * normal. The default is <code>true</code>.
295 * @param overwriteMode the new value for the <code>overwriteMode</code>
298 public void setOverwriteMode(boolean overwriteMode)
300 this.overwriteMode = overwriteMode;
304 * Returns whether or not invalid edits are allowed or not. If invalid
305 * edits are allowed, the JFormattedTextField may temporarily contain invalid
308 * @return the value of the allowsInvalid property
310 public boolean getAllowsInvalid()
312 return allowsInvalid;
316 * Sets the value of the <code>allowsInvalid</code> property.
318 * @param allowsInvalid the new value for the property
320 * @see #getAllowsInvalid()
322 public void setAllowsInvalid(boolean allowsInvalid)
324 this.allowsInvalid = allowsInvalid;
328 * Returns the class that is used for values. When Strings are converted
329 * back to values, this class is used to create new value objects.
331 * @return the class that is used for values
333 public Class<?> getValueClass()
339 * Sets the class that is used for values.
341 * @param valueClass the class that is used for values
343 * @see #getValueClass()
345 public void setValueClass(Class<?> valueClass)
347 this.valueClass = valueClass;
351 * Converts a String (from the JFormattedTextField input) to a value.
352 * In order to achieve this, the formatter tries to instantiate an object
353 * of the class returned by #getValueClass() using a single argument
354 * constructor that takes a String argument. If such a constructor cannot
355 * be found, the String itself is returned.
357 * @param string the string to convert
359 * @return the value for the string
361 * @throws ParseException if the string cannot be converted into
362 * a value object (e.g. invalid input)
364 public Object stringToValue(String string)
365 throws ParseException
367 Object value = string;
368 Class valueClass = getValueClass();
369 if (valueClass == null)
371 JFormattedTextField jft = getFormattedTextField();
373 valueClass = jft.getValue().getClass();
375 if (valueClass != null)
378 Constructor constr = valueClass.getConstructor
379 (new Class[]{String.class});
380 value = constr.newInstance(new Object[]{ string });
382 catch (NoSuchMethodException ex)
384 // leave value as string
388 throw new ParseException(string, 0);
394 * Converts a value object into a String. This is done by invoking the
395 * {@link Object#toString()} method on the value.
397 * @param value the value to be converted
399 * @return the string representation of the value
401 * @throws ParseException if the value cannot be converted
403 public String valueToString(Object value)
404 throws ParseException
408 return value.toString();
412 * Creates and returns a clone of this DefaultFormatter.
414 * @return a clone of this object
416 * @throws CloneNotSupportedException not thrown here
418 public Object clone()
419 throws CloneNotSupportedException
421 return super.clone();
425 * Returns the DocumentFilter that is used to restrict input.
427 * @return the DocumentFilter that is used to restrict input
429 protected DocumentFilter getDocumentFilter()
431 return new FormatterDocumentFilter();