net.rim.device.api.ui.text
Class TextFilter

java.lang.Object
  |
  +--net.rim.device.api.ui.text.TextFilter

Direct Known Subclasses:

EmailAddressTextFilter, HexadecimalTextFilter, IPTextFilter, LowercaseTextFilter, NumericTextFilter, PhoneTextFilter, UppercaseTextFilter, URLTextFilter

public abstract class TextFilter

extends Object

Defines fundamental functionality for a text filtering object.

A filter has two funtions: first, it can validate whether a character or string is valid, and second it can map characters onto ones more likely to be valid.

Field Summary

static int	DEFAULT Default filter type.
static int	EMAIL Email address filter type.
static int	HEXADECIMAL Hexadecimal filter type.
static int	INTEGER Integer filter type.
static int	LOWERCASE Lower case filter type.
static int	NUMERIC Numeric filter type.
static int	PHONE Phone number filter type.
static int	UPPERCASE Upper case filter type.
static int	URL URL filter type.

Constructor Summary

protected

TextFilter() Constructs a new TextFilter instance.

Method Summary

abstract char	convert(char character, int status) Retrieves filtered version of provided character.
static TextFilter	get(int type) Retrieve a filter of provided type.
boolean	validate(AbstractString text) Determines if provided string contains valid characters.
abstract boolean	validate(char character) Validates character for use with this filter.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT

public static final int DEFAULT

Default filter type.

NUMERIC

public static final int NUMERIC

Numeric filter type.

UPPERCASE

public static final int UPPERCASE

Upper case filter type.

LOWERCASE

public static final int LOWERCASE

Lower case filter type.

HEXADECIMAL

public static final int HEXADECIMAL

Hexadecimal filter type.

INTEGER

public static final int INTEGER

Integer filter type.

PHONE

public static final int PHONE

Phone number filter type.

URL

public static final int URL

URL filter type.

EMAIL

public static final int EMAIL

Email address filter type.

Constructor Detail

TextFilter

protected TextFilter()

Constructs a new TextFilter instance.

Method Detail

convert

public abstract char convert(char character,
                             int status)

Retrieves filtered version of provided character.

This method may not return a character valid for this filter; however, it may return 0 to indicate that the provided character is not valid.

For example, an UppercaseTextFilter would convert any lower case character to its upper case equivalent. However, if passed a number it could either leave the number unchanged to be filtered by validate(char), or convert it to \u0000.

Parameters:

character - Character to convert.

status - Indicates how the character was generated: some filters use this to affect the conversion performed.

Returns:

Filtered version of provided character.

Since:

JDE 3.7.0

get

public static final TextFilter get(int type)

Retrieve a filter of provided type.

Factory method that produces a text filter of your specified type.

Parameters:

type - Type of filter you want.

Returns:

Text filter object of your specified type, or null if you specify either DEFAULT for type, or an invalid type.

Since:

JDE 3.7.0

validate

public abstract boolean validate(char character)

Validates character for use with this filter.

This only considers if it is in the correct set of characters.

Parameters:

character - Character to test.

Returns:

True if this character would pass through this filter unaltered; otherwise, false.

Since:

JDE 3.7.0

validate

public boolean validate(AbstractString text)

Determines if provided string contains valid characters.

The default implementation of this method returns true if each character is valid within the field (determined by invoking validate(char). This is useful for upper case or lower case filters, for example, but filters that rely on character position must override this method.

Parameters:

text - String to test.

Returns:

True if each character in the string passes a validity check; otherwise, false.

Since:

JDE 3.7.0