branch_for_jsf_2_0/examples/hello_bean-validation/src/main/java/org/apache/myfaces/blank/validation/NameConstraintValidator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.myfaces.blank.validation;

import org.apache.myfaces.blank.domain.Person;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class NameConstraintValidator implements
        ConstraintValidator<NameConstraint, org.apache.myfaces.blank.domain.Person>
{
    public void initialize(NameConstraint differentName)
    {
    }

    public boolean isValid(Person person, ConstraintValidatorContext constraintValidatorContext)
    {
        if(person == null || isEmpty(person.getFirstName()) || isEmpty(person.getLastName()))
        {
            return true;
        }

        return !(person.getFirstName().equals(person.getLastName()));
    }

    private boolean isEmpty(String value)
    {
        return value == null || "".equals(value);
    }
}