EmailConstraintValidator.java

/*
 * Copyright 2009 Prime Technology.
 *
 * 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 org.primefaces.examples.validate;

import java.util.regex.Pattern;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * ConstraintValidator for Email Input
 */
public class EmailConstraintValidator implements ConstraintValidator<Email, String>{

    private Pattern pattern;
 
	private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@"
                                                + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
    
    public void initialize(Email a) {
        pattern = Pattern.compile(EMAIL_PATTERN);
    }

    public boolean isValid(String value, ConstraintValidatorContext cvc) {
        if(value == null)
            return true;
        else
            return pattern.matcher(value.toString()).matches();
    }
    
}