There’s More to Life Than Strings: Working with Data Types - Stripes...and Java Web Development is Fun Again - page 101

\\(? ( \\d{3} ) \\)? [-. ]? ( \\d{3} ) [-. ]? ( \\d{4} )

Grouping

Figure 5.4: Using grouping in a regular expression

properties, and Stripes will automatically use the phone number type
converter. We can still override the default for a given property by using
the converter= attribute.

Implementing a Formatter
With a type converter for the PhoneNumber data type, we're halfway
there. Let's implement a formatter, with two format types:

• "dashes" : NNN-NNN-NNNN

• "parens" : (NNN) NNN-NNNN

With a default value for the format type (say, "dashes" ), the formatType=
attribute will be optional. The formatPattern= attribute will not be used.
Here is the resulting PhoneNumberFormatter :

Download email_07/src/stripesbook/ext/PhoneNumberFormatter.java

package stripesbook.ext;
public class PhoneNumberFormatter implements Formatter<PhoneNumber> {
private String formatType = "dashes";

public void setFormatType(String formatType) {
this .formatType = formatType;

}
public void setLocale(Locale locale) { }
public void setFormatPattern(String formatPattern) { }
public void init() { }

public String format(PhoneNumber phoneNumber) {
String format = null ;
if ("dashes".equalsIgnoreCase(formatType)) {
format = "%s-%s-%s";

}