org.hibernate.validator.EmailValidator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of hibernate-validator-legacy Show documentation

Following the DRY (Don't Repeat Yourself) principle, Hibernate Validator let's you express your domain constraints once (and only once) and ensure their compliance at various level of your system automatically.

There is a newer version: 4.0.2.GA

Show newest version

//$Id: EmailValidator.java 15765 2009-01-09 14:56:30Z hardy.ferentschik $
package org.hibernate.validator;

import java.io.Serializable;
import java.util.regex.Matcher;

/**
 * Check that a given string is a well-formed email address
 *
 * @author Emmanuel Bernard
 */
public class EmailValidator implements Validator, Serializable {
	//TODO: Implement this http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html regex in java
	private static String ATOM = "[^\\x00-\\x1F^\\(^\\)^\\<^\\>^\\@^\\,^\\;^\\:^\\\\^\\\"^\\.^\\[^\\]^\\s]";
	private static String DOMAIN = "(" + ATOM + "+(\\." + ATOM + "+)*";
	private static String IP_DOMAIN = "\\[[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\]";

	private java.util.regex.Pattern pattern;

	public boolean isValid(Object value) {
		if ( value == null ) return true;
		if ( !( value instanceof String ) ) return false;
		String string = (String) value;
		if ( string.length() == 0 ) return true;
		Matcher m = pattern.matcher( string );
		return m.matches();
	}

	public void initialize(Email parameters) {
		pattern = java.util.regex.Pattern.compile(
				"^" + ATOM + "+(\\." + ATOM + "+)*@"
						 + DOMAIN
						 + "|"
						 + IP_DOMAIN
						 + ")$",
				java.util.regex.Pattern.CASE_INSENSITIVE
		);
	}
}