AbstractEmailConstraintValidator.java

package org.jboss.capedwarf.validation.api;

import java.lang.annotation.Annotation;
import java.util.regex.Pattern;

/**
 * javax.validation email validator.
 *
 * @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
 */
public abstract class AbstractEmailConstraintValidator<T extends Annotation> extends AbstractPatternConstraintValidator<T> {
    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 static java.util.regex.Pattern pattern = java.util.regex.Pattern.compile(
            "^" + ATOM + "+(\\." + ATOM + "+)*@"
                    + DOMAIN
                    + "|"
                    + IP_DOMAIN
                    + ")$",
            java.util.regex.Pattern.CASE_INSENSITIVE
    );

    protected Pattern createPattern(T constraintAnnotation) {
        return pattern;
    }

    protected Boolean lengthCheck(String string) {
        return (string.length() == 0) ? true : null;
    }
}