Class DefaultFormatter

All Implemented Interfaces:
Serializable, Cloneable
Direct Known Subclasses:
InternationalFormatter, MaskFormatter 
public class DefaultFormatter
extends JFormattedTextField.AbstractFormatter
implements Cloneable, Serializable

DefaultFormatter formats arbitrary objects. Formatting is done by invoking the toString method. In order to convert the value back to a String, your class must provide a constructor that takes a String argument. If no single argument constructor that takes a String is found, the returned value will be the String passed into stringToValue.

Instances of DefaultFormatter can not be used in multiple instances of JFormattedTextField. To obtain a copy of an already configured DefaultFormatter, use the clone method.

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
See Also:
JFormattedTextField.AbstractFormatter, Serialized Form

Constructors

Constructor Description
DefaultFormatter()

Creates a DefaultFormatter.

Methods

Modifier and Type Method Description
Object clone()

Creates a copy of the DefaultFormatter.
boolean getAllowsInvalid()

Returns whether or not the value being edited is allowed to be invalid for a length of time.
boolean getCommitsOnValidEdit()

Returns when edits are published back to the JFormattedTextField.
protected DocumentFilter getDocumentFilter()

Returns the DocumentFilter used to restrict the characters that can be input into the JFormattedTextField.
protected NavigationFilter getNavigationFilter()

Returns the NavigationFilter used to restrict where the cursor can be placed.
boolean getOverwriteMode()

Returns the behavior when inserting characters.
Class<?> getValueClass()

Returns that class that is used to create new Objects.
void install​(JFormattedTextField ftf)

Installs the DefaultFormatter onto a particular JFormattedTextField.
void setAllowsInvalid​(boolean allowsInvalid)

Sets whether or not the value being edited is allowed to be invalid for a length of time (that is, stringToValue throws a ParseException).
void setCommitsOnValidEdit​(boolean commit)

Sets when edits are published back to the JFormattedTextField.
void setOverwriteMode​(boolean overwriteMode)

Configures the behavior when inserting characters.
void setValueClass​(Class<?> valueClass)

Sets that class that is used to create new Objects.
Object stringToValue​(String string)

Converts the passed in String into an instance of getValueClass by way of the constructor that takes a String argument.
String valueToString​(Object value)

Converts the passed in Object into a String by way of the toString method.

Methods declared in class javax.swing.JFormattedTextField.AbstractFormatter

getActions, getFormattedTextField, invalidEdit, setEditValid, uninstall

Methods declared in class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

DefaultFormatter

public DefaultFormatter()

Creates a DefaultFormatter.

Methods

install

public void install(JFormattedTextField ftf)

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.

Overrides:
install in class JFormattedTextField.AbstractFormatter
Parameters:
ftf - JFormattedTextField to format for, may be null indicating uninstall from current JFormattedTextField.

setCommitsOnValidEdit

public void setCommitsOnValidEdit(boolean commit)

Sets when edits are published back to the JFormattedTextField. If true, commitEdit is invoked after every valid edit (any time the text is edited). On the other hand, if this is false than the DefaultFormatter does not publish edits back to the JFormattedTextField. As such, the only time the value of the JFormattedTextField will change is when commitEdit is invoked on JFormattedTextField, typically when enter is pressed or focus leaves the JFormattedTextField.

Parameters:
commit - Used to indicate when edits are committed back to the JTextComponent

getCommitsOnValidEdit

public boolean getCommitsOnValidEdit()

Returns when edits are published back to the JFormattedTextField.

Returns:
true if edits are committed after every valid edit

setOverwriteMode

public void setOverwriteMode(boolean overwriteMode)

Configures the behavior when inserting characters. If overwriteMode is true (the default), new characters overwrite existing characters in the model.

Parameters:
overwriteMode - Indicates if overwrite or overstrike mode is used

getOverwriteMode

public boolean getOverwriteMode()

Returns the behavior when inserting characters.

Returns:
true if newly inserted characters overwrite existing characters

setAllowsInvalid

public void setAllowsInvalid(boolean allowsInvalid)

Sets whether or not the value being edited is allowed to be invalid for a length of time (that is, stringToValue throws a ParseException). It is often convenient to allow the user to temporarily input an invalid value.

Parameters:
allowsInvalid - Used to indicate if the edited value must always be valid

getAllowsInvalid

public boolean getAllowsInvalid()

Returns whether or not the value being edited is allowed to be invalid for a length of time.

Returns:
false if the edited value must always be valid

setValueClass

public void setValueClass(Class<?> valueClass)

Sets that class that is used to create new Objects. If the passed in class does not have a single argument constructor that takes a String, String values will be used.

Parameters:
valueClass - Class used to construct return value from stringToValue

getValueClass

public Class<?> getValueClass()

Returns that class that is used to create new Objects.

Returns:
Class used to construct return value from stringToValue

stringToValue

public Object stringToValue(String string)
                     throws ParseException

Converts the passed in String into an instance of getValueClass by way of the constructor that takes a String argument. If getValueClass returns null, the Class of the current value in the JFormattedTextField will be used. If this is null, a String will be returned. If the constructor throws an exception, a ParseException will be thrown. If there is no single argument String constructor, string will be returned.

Specified by:
stringToValue in class JFormattedTextField.AbstractFormatter
Parameters:
string - String to convert
Returns:
Object representation of text
Throws:
ParseException - if there is an error in the conversion

valueToString

public String valueToString(Object value)
                     throws ParseException

Converts the passed in Object into a String by way of the toString method.

Specified by:
valueToString in class JFormattedTextField.AbstractFormatter
Parameters:
value - Value to convert
Returns:
String representation of value
Throws:
ParseException - if there is an error in the conversion

getDocumentFilter

protected DocumentFilter getDocumentFilter()

Returns the DocumentFilter used to restrict the characters that can be input into the JFormattedTextField.

Overrides:
getDocumentFilter in class JFormattedTextField.AbstractFormatter
Returns:
DocumentFilter to restrict edits

getNavigationFilter

protected NavigationFilter getNavigationFilter()

Returns the NavigationFilter used to restrict where the cursor can be placed.

Overrides:
getNavigationFilter in class JFormattedTextField.AbstractFormatter
Returns:
NavigationFilter to restrict navigation

clone

public Object clone()
             throws CloneNotSupportedException

Creates a copy of the DefaultFormatter.

Overrides:
clone in class JFormattedTextField.AbstractFormatter
Returns:
copy of the DefaultFormatter
Throws:
CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.
See Also:
Cloneable

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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/swing/text/DefaultFormatter.html