br.com.anteros.bean.validation.routines.EMailValidationUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of Anteros-Bean-Validation Show documentation

Anteros Bean Validation for Java.

There is a newer version: 1.0.18

Show newest version

/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package br.com.anteros.bean.validation.routines;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Description: holds the regexp to validate an email address

 * User: roman.stumm

 * Date: 17.06.2010

 * Time: 10:40:59

 */
public class EMailValidationUtils {
    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}\\]";
    public static final java.util.regex.Pattern DEFAULT_EMAIL_PATTERN;

    static {
        DEFAULT_EMAIL_PATTERN =
            java.util.regex.Pattern.compile("^" + ATOM + "+(\\." + ATOM + "+)*@" + DOMAIN + "|" + IP_DOMAIN + ")$",
                java.util.regex.Pattern.CASE_INSENSITIVE);
    }

    /**
     * Learn whether a given object is a valid email address.
     * 
     * @param value
     *            to check
     * @return true if the validation passes
     */
    public static boolean isValid(Object value) {
        return isValid(value, DEFAULT_EMAIL_PATTERN);
    }

    /**
     * Learn whether a particular value matches a given pattern per
     * {@link Matcher#matches()}.
     * 
     * @param value
     * @param aPattern
     * @return true if value was a String
     *         matching aPattern
     */
    // TODO it would seem to make sense to move or reduce the visibility of this
    // method as it is more general than email.
    public static boolean isValid(Object value, Pattern aPattern) {
        if (value == null)
            return true;
        if (!(value instanceof CharSequence))
            return false;
        CharSequence seq = (CharSequence) value;
        if (seq.length() == 0)
            return true;
        Matcher m = aPattern.matcher(seq);
        return m.matches();
    }

}